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name: CI
on: push
jobs:
deploy-website:
environment: Production
runs-on: ubuntu-latest
steps:
- name: Install Protoc
uses: arduino/setup-protoc@v1
- name: Install Go
uses: actions/setup-go@v2
- name: Install protoc-gen-doc
run: go get -u github.com/pseudomuto/protoc-gen-doc/cmd/protoc-gen-doc
- name: Checkout code
uses: actions/checkout@v2
with:
submodules: true
- name: Generate protobuf docs
run: protoc --doc_out="website/docs/protobufs" --doc_opt="./website/protobuf.tmpl,api.md" --proto_path="protobufs" protobufs/*.proto
- uses: amondnet/vercel-action@v20
with:
vercel-token: ${{ secrets.VERCEL_TOKEN }}
vercel-args: "--prod"
vercel-org-id: ${{ secrets.ORG_ID}}
vercel-project-id: ${{ secrets.PROJECT_ID}}
working-directory: website

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node_modules/
*.Identifier
.docusaurus
build
.vercel

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[submodule "website/static/img/meshtastic-design"]
path = website/static/img/meshtastic-design
url = https://github.com/meshtastic/meshtastic-design/
[submodule "protobufs"]
path = protobufs
url = https://github.com/meshtastic/meshtastic-protobufs/
s

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</span>
<br />
<hr />
</div>
@ -47,25 +45,24 @@ The radios automatically create a mesh to forward packets as needed, so everyone
</td>
</tr>
</table>
## Getting started
###### Description, should mention:
You will require atleast one of [these](https://github.com/meshtastic/meshtastic-device#supported-hardware) devices
* Link to device compatability table on `meshtastic/meshtastic-device`
* Link to flashing instructions
- Link to device compatability table on `meshtastic/meshtastic-device`
- Link to flashing instructions
## Community
###### Description, should mention:
* Discussions tab: https://github.com/meshtastic/Meshtastic/discussions
* Forum
* Slack
* unofficial/international communities
* Maybe have an `awesome-meshtastic` page, have all of the apps and extensions ppl have made
- Discussions tab: https://github.com/meshtastic/Meshtastic/discussions
- Forum
- Slack
- unofficial/international communities
- Maybe have an `awesome-meshtastic` page, have all of the apps and extensions ppl have made
## Software
@ -74,57 +71,47 @@ You will require atleast one of [these](https://github.com/meshtastic/meshtastic
#### Meshtastic App
<table>
<tr>
<td>
<p>
The official Meshtastic Android app, It provides messaging, channel configuration and a real time map. It also has inbuilt functionality for updating device firmware over Bluetooth
</p>
</td>
</tr>
<tr>
<td>
<p>
The official Meshtastic Android app, It provides messaging, channel configuration and a real time map. It also has inbuilt functionality for updating device firmware over Bluetooth
</p>
</td>
</tr>
</table>
#### Meshtastic Device
<table>
<tr>
<td>
<p>
The paramount Meshtastic project, the device firmware itself. Runs on supported hardware that allows the creation of mesh networks at any scale
</p>
</td>
</tr>
<tr>
<td>
<p>
The paramount Meshtastic project, the device firmware itself. Runs on supported hardware that allows the creation of mesh networks at any scale
</p>
</td>
</tr>
</table>
#### Meshtastic.js
<table>
<tr>
<td>
<p>
TypeScript library for interfacting with Meshtastic, built with RxJs and ProtoBuf.js
</p>
</td>
</tr>
<tr>
<td>
<p>
TypeScript library for interfacting with Meshtastic
</p>
</td>
</tr>
</table>
#### Meshtastic-python
<table>
<tr>
<td>
<p>
A Python client for using Meshtastic devices. This small library (and example application) provides an easy API for sending and receiving messages over mesh radios.
</p>
<p>
It also provides access to any of the operations/data available in the device user interface or the Android application. Events are delivered using a publish-subscribe model, and you can subscribe to only the message types you are interested in.
</p>
</td>
</tr>
<tr>
<td>
<p>
Description about product
</p>
</td>
</tr>
</table>

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Subproject commit 5cb09ec96321ce0cfae18141e5da3b75e001c9fe

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# Website
This website is built using [Docusaurus 2](https://v2.docusaurus.io/), a modern static website generator.
## Installation
```console
yarn install
```
## Local Development
```console
yarn start
```
This command starts a local development server and open up a browser window. Most changes are reflected live without having to restart the server.
## Build
```console
yarn build
```
This command generates static content into the `build` directory and can be served using any static contents hosting service.
## Deployment
```console
GIT_USER=<Your GitHub username> USE_SSH=true yarn deploy
```
If you are using GitHub pages for hosting, this command is a convenient way to build the website and push to the `gh-pages` branch.

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module.exports = {
presets: [require.resolve('@docusaurus/core/lib/babel/preset')],
};

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---
id: documents
title: Useful Documents
sidebar_label: Useful Documents
---
## LoRa
[LoRa Design Guide](/documents/LoRa_Design_Guide.pdf)

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---
id: faq
title: Frequently Asked Questions
sidebar_label: FAQ
---
## Disclaimers
This project is still pretty young but moving at a pretty good pace. Not all features are fully implemented in the current alpha builds.
Most of these problems should be solved by the beta release (within three months):
- We don't make these devices and they haven't been tested by UL or the FCC. If you use them you are experimenting and we can't promise they won't burn your house down ;-)
- The encryption implementation is good but see this list of [caveats](software/crypto.md#summary-of-strengthsweaknesses-of-our-current-implementation) to determine risks you might face.
- A number of (straightforward) software work items have to be completed before battery life matches our measurements, currently battery life is about three days. Join us on chat if you want the spreadsheet of power measurements/calculations.
- The Android API needs to be documented better
- No one has written an iOS app yet. But some good souls [are talking about it](https://github.com/meshtastic/Meshtastic-esp32/issues/14) ;-)
For more details see the [device software TODO](https://github.com/meshtastic/Meshtastic-esp32/blob/master/docs/software/TODO.md) or the [Android app TODO](https://github.com/meshtastic/Meshtastic-Android/blob/master/TODO.md).
## FAQ
If you have a question missing from this faq, please [ask in our discussion forum](https://meshtastic.discourse.group/). And if you are feeling extra generous send in a pull-request for this faq.md with whatever we answered ;-).
### Q: Which of the various supported radios should I buy?
Basically you just need the radio + (optional but recommended) battery. The TBEAM is usually better because it has gps and huge battery socket. The Heltec is basically the same hardware but without the GPS (the phone provides position data to the radio in that case, so the behavior is similar - but it does burn some battery in the phone). Also the battery for the Heltec can be smaller.
In addition to Aliexpress, (banggood.com) usually has stock and faster shipping, or Amazon. If buying a TBEAM, make sure to buy a version that includes the OLED screen - this project doesn't absolutely require the screen, but we use it if is installed.
@claesg has added links to various 3D printable cases, you can see them at (www.meshtastic.org).
### Q: Do you have plans to commercialize this project
Nope. though if some other person/group wanted to use this software and a more customized device we think that would be awesome (as long as they obey the GPL license).
### Q: Does this project use patented algorithms?
(Kindly borrowed from the geeks at [ffmpeg](http://ffmpeg.org/legal.html))
We do not know, we are not lawyers so we are not qualified to answer this. Also we have never read patents to implement any part of this, so even if we were qualified we could not answer it as we do not know what is patented. Furthermore the sheer number of software patents makes it impossible to read them all so no one (lawyer or not) could answer such a question with a definite no. We are merely geeks experimenting on a fun and free project.

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---
id: http-api
title: HTTP API
sidebar_label: HTTP API
---
:::info
This is a mini-spec on a HTTP API which can be used by browser based clients to do operations with devices.
:::
## Why protobufs
- No need for JSON parsing on the resource constrained embedded server.
- Small.
- Already in use for all other transports (so shared testing/tooling coverage)
- Backwards and forward compatible
## Request headers
- Content-Type: application/x-protobuf
- Cookie: session=ABAD1D (this header is added automatically by the browser client, not implemented yet)
## Response headers
- Content-Type: application/x-protobuf (indicates meshtatics protobufs)
- X-Protobuf-Schema: <URI to the .proto schema file> (not required but recommended for documentation/reflection purposes)
(not implemented) All clients (if their request did not include a session cookie) will be assigned a random and unique session key. The cookie will not be set if the client already has one. Example response:
- Set-Cookie: session=ABAD1D;path=/
(FIXME - check how this relates to XSS attacks)
## Endpoints
Two endpoints are specified:
### PUT /api/v1/toradio
A PUT to this endpoint will be expected to contain a series of ToRadio protobuf payloads. For the initial implementation only one ToRadio message per PUT is supported, but future optimizations to improve throughput might add support for multiple ToRadios in a single PUT.
The protobufs will be sent in binary as the body for the request.
A request with OPTIONS to this endpoint will return status 204 and just the headers.
### GET /api/v1/fromradio?chunked=false|true&all=true|false
A GET from this endpoint will return a series of FromRadio protobufs.
- chunked=false|true (not implemented)
- If the query parameter "chunked" is false (or unset), the GET will simply return all the protobufs which can currently be delivered for this clients session (this would allow the client to poll by doing a series of GETs). This is the only option that is supported in the initial release.
- Eventually if chunked=true, the response will be a [stream of chunks](https://en.wikipedia.org/wiki/Chunked_transfer_encoding) that the server will keep open as long as the client wants. This will allow efficient streaming of new FromRadio protobufs as they are generated by the radio.
- all=true|false
- If this query is false (or unset), the GET will return just one protobuf. If set to true, will return all the available protobufs.
The protobufs will be sent in binary as the body for the request.
## Authentication
The initial release will not have **any** user authentication. i.e. we assume access to the HTTP server is enough to establish trust.
Since authentication is also eventually needed for our other transports (TCP and eventually open BLE), we will be adding authentication **in-band**. When added in the second release there will be a new payload supported inside ToRadio for `SignIn <userid> <usersecret>`. The server will respond with a FromRadio `SignInResponse okay|fail`. Also, in the case of the REST API, that SignIn status will then be associated with the current session key. Most (all?) ToRadio packets will be ignored if the client is not signed in. Most (all?) FromRadio packets will be sent to clients that are not signed in.
## Client
### Javascript
See: <https://github.com/meshtastic/meshtastic.js>
A reference client written in Javascript will provide a Javascript API for using this transport. That client will do HTTP connections, use the generated protobuf javascript code and provide an API that hides all of this REST plumbing. The two key methods will be "sendToRadio(packet) and onFromRadio(callback)".
### Protoman
See: <https://github.com/spluxx/Protoman>
Protoman is able to interface with the Meshtastic REST API out of the box. This is useful for manual testing of the endpoints.
## Security
HTTP and HTTPS are both supported on the esp32 using self signed certificates on HTTPS.
## Related documents
- Interesting slide pack on the concept: <https://www.slideshare.net/mokeefe/javaone-2009-ts5276-restful-protocol-buffers>

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---
id: radio-settings
title: Radio Settings
sidebar_label: Radio Settings
---
We use the same channel maps as LoRaWAN (though this is not LoRaWAN).
![freq table](/img/LoRa-Frequency-Bands.jpg)
See [this site](https://www.rfwireless-world.com/Tutorials/LoRa-channels-list.html) for more information.
## LoRaWAN Europe Frequency Band
The maximum power allowed is +14dBm ERP (Effective Radiated Power, see [this site](https://en.wikipedia.org/wiki/Effective_radiated_power) for more information).
### 433 MHz
There are eight channels defined with a 0.2 MHz gap between them.
Channel zero starts at 433.175 MHz
### 870 MHz
There are eight channels defined with a 0.3 MHz gap between them.
Channel zero starts at 865.20 MHz
## LoRaWAN for North America
LoRaWAN defines 64, 125 kHz channels from 902.3 to 914.9 MHz increments.
The maximum output power for North America is +30 dBm ERP.
The band is from 902 to 928 MHz. It mentions channel number and its respective channel frequency. All the 13 channels are separated by 2.16 MHz with respect to the adjacent channels.
Channel zero starts at 903.08 MHz center frequency.
## Data-rates
### About
Various data-rates are selectable when configuring a channel and are inversely proportional to the theoretical range of the devices.
Considerations:
- Spreading Factor - How much we "spread" our data over time.
- Each step up in Spreading Factor dobules the airtime to transmit.
- Each step up in Spreading Factor adds about 2.5db extra link budget.
- Bandwidth - How big of a slice of the spectrum we use.
- Each doubling of the bandwidth is almost 3db less link budget.
- Bandwidths less than 31 may be unstable unless you have a high quality Crystal Ossilator.
- Coding Rate - How much redundency we encode to resist noise.
- Increasing coding rate increases reliability while decrasing data-rate.
- 4/5 - 1.25x overhead
- 4/6 - 1.5x overhead
- 4/7 - 1.75x overhead
- 4/8 - 2x overhead
### Pre-Defined
We have four predefined channels. These are the most common settings and have been proven to work well:
| Channel setting | Alt Channel Name | Data-rate | SF / Symbols | Coding Rate | Bandwidth | Link Budget |
| :------------------------- | :--------------- | :------------------- | :----------- | :---------- | :-------- | :---------- |
| Short range (but fast) | Short Fast | 21.875 kbps | 7 / 128 | 4/5 | 125 | 134dB |
| Medium range (but fast) | Medium | 5.469 kbps | 7 / 128 | 4/5 | 500 | 140dB |
| Long range (but slower) | Long Alt | 0.275 kbps | 9 / 512 | 4/8 | 31 | 153dB |
| Very long range (but slow) | Long Slow | 0.183 kbps (default) | 12 / 4096 | 4/8 | 125 | 154dB |
The link budget used by these calculations assumes a transmit power of 17dBm and an antenna with 0dB gain. Adjust your link budget assumptions based on your actual devices.
### Custom Settings
You may want to select other channels for your usage. The other settings can be set by using the Python API.
```bash
meshtastic --setchan spread_factor 10 --setchan coding_rate 8 --setchan bandwidth 125
```
After applying the settings, you will need to restart the device. After your device is restarted, it will generate a new crypto key and you will need to share the newly generated QR Code or URL to all your other devices.
Some example settings:
| Data-rate | SF / Symbols | Coding Rate | Bandwidth | Link Budget | Note |
| :--------- | :----------- | :---------- | :-------- | :---------- | :---------------------------------------------------------------------- |
| 37.50 kbps | 6 / 64 | 4/5 | 500 | 129dB | Fastest possible speed |
| 3.125 kbps | 8 / 256 | 4/5 | 125 | 143dB | |
| 1.953 kbps | 8 / 256 | 4/8 | 125 | 143dB | |
| 1.343 kbps | 11 / 2048 | 4/8 | 500 | 145dB | |
| 1.099 kbps | 9 / 512 | 4/8 | 125 | 146dB | |
| 0.814 kbps | 10 / 1024 | 4/6 | 125 | 149dB | |
| 0.610 kbps | 10 / 1024 | 4/8 | 125 | 149dB | |
| 0.488 kbps | 11 / 2048 | 4/6 | 125 | 152dB | |
| 0.336 kbps | 11 / 2048 | 4/8 | 125 | 152dB | |
| 0.073 kbps | 12 / 4096 | 4/5 | 31 | 160dB | Twice the range and/or coverage of "Long Slow", low resliance to noise |
| 0.046 kbps | 12 / 4096 | 4/8 | 31 | 160dB | Twice the range and/or coverage of "Long Slow", high resliance to noise |
The link budget used by these calculations assumes a transmit power of 17dBm and an antenna with 0dB gain. Adjust your link budget assumptions based on your actual devices.
These channel settings may have not been tested. Use at your own discression. Share on <https://meshtastic.discourse.group> with your successes or failure.
## Cryptography
The preshared key used by the devices can be modified.
- 0 = No crypto
- 1 = Default channel key
- 2 - 10 = The default channel key, except with 1 through 9 added to the last byte
Use of cryptography can also be modified. To disable cryptography (maybe useful if you have HAM radio license):
```bash
meshtastic --setchan psk 0
```

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---
id: supported-hardware
title: Supported Hardware
sidebar_label: Supported Hardware
---
| Vendor | Product line | Version | Board labels | Notes | URL |
| ------ | ------------ | ------- | ---------------- | --------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------- |
| TTGO | T-Beam | 0.7 | T22_V07 20180711 | LoRa 433/470MHz _OR_ LoRa 868/915MHz , <br/>GPS ublox NEO-6M , <br/>battery holder for Li-Ion 18650 | [buy](https://www.aliexpress.com/item/4000574335430.html) |
| TTGO | T-Beam | 1.0 | | | [buy](https://www.aliexpress.com/item/4001178678568.html) |
| TTGO | T-Beam | 1.1 | T22_V11 20191212 | LoRa 433/470MHz _OR_ LoRa 868/915MHz _OR_ LoRa 923MHz , <br/>GPS ublox NEO-M8N , <br/>battery holder for Li-Ion 18650 | [buy](https://www.aliexpress.com/item/4001178678568.html) |
| TTGO | Lora32 | 2.0 | _missing_ | LoRa 433/470MHz _OR_ LoRa 868/915MHz , <br/>OLED SSD1306 , <br/>SD card holder | [buy](https://www.aliexpress.com/item/4000211331316.html) |
| TTGO | Lora32 | 2.1 | T3_V1.6 20180606 | LoRa 32 (V2) , <br/>SD card holder | [buy](https://www.aliexpress.com/item/4000119208093.html) |
| Heltec | Lora 32 | V2 | V2 | LoRa 433/470MHz _OR_ LoRa 868/915MHz | [buy](https://heltec.org/project/wifi-lora-32/) |

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---
id: connecting
title: Connecting to a device
sidebar_label: Connecting
---
Currently Two connection methods are supported, HTTP and BLE.
## HTTP
## BLE
```typescript
//connection method
```
```tsx
//connection button
const a = <connectButton method={someMethod} />;
```

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---
id: events
title: Subscribing to device events
sidebar_label: Events
---
## Preface
The event system that the library uses is provided by RxJS, this is the fundamental way in which to interract with tevices and the mesh network.
:::tip
Full guide to using RxJS is avaliable at [rxjs.dev](https://rxjs.dev/guide/overview)
:::
...
:::info
Many of the packet types that the device is designed to send are automatically processed and decoded for you in there own event stream
:::
## Events
### Heartbeat
### Device Status
### Device Transation
### From Radio
### Data Packet
### My Node Info
### Radio Config
### Node Packet
### Position Packet
### Text Packet

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---
id: getting-started
title: Getting Started
sidebar_label: Getting Started
---
:::tip
Full API docummentation is avaliable at [js.meshtastic.org](https://js.meshtastic.org)
:::
## Intro
Meshtastic.js is a JavaScript library that provides an interface to Meshtastic devices. It can be used to build applications to interface with a Meshtastic network. Currently HTTP(S) and Bluetooth connections are supported.
## Connection methods
### HTTP(S)
### Bluetooth
### Serial

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---
id: http-api
title: HTTP API
sidebar_label: HTTP API
---
:::info
Methods and types for using the device [HTTP API](http://example.com) are exported
:::
```typescript
import {
Client,
Types,
Protobuf,
SettingsManager,
} from "@meshtastic/meshtasticjs";
/**
* Connection method
*/
const client = new Client();
SettingsManager.setDebugMode(Protobuf.LogLevelEnum.DEBUG);
const connection = client.createHTTPConnection();
connection.connect("192.168.x.x");
const restartDevice: Promise<void> = connection.restartDevice();
const getStatistics: Promise<void | Types.WebSPIFFSResponse> = connection.getStatistics();
const getNetworks: Promise<void | Types.WebNetworkResponse> = connection.getNetworks();
const getSPIFFS: Promise<void | Types.WebSPIFFSResponse> = connection.getSPIFFS();
const deleteSPIFFS: Promise<void | Types.WebSPIFFSResponse> = connection.deleteSPIFFS();
const blinkLED: Promise<void | any> = connection.blinkLED();
```

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---
id: overview
title: What is Meshtastic?
sidebar_label: Overview
slug: /
---
Meshtastic® is a project that lets you use
inexpensive ($30 ish) GPS radios as an extensible, long battery life, secure, mesh GPS communicator. These radios are great for hiking, skiing, paragliding - essentially any hobby where you don't have reliable internet access. Each member of your private mesh can always see the location and distance of all other members and any text messages sent to your group chat.
The radios automatically create a mesh to forward packets as needed, so everyone in the group can receive messages from even the furthest member. The radios will optionally work with your phone, but no phone is required.
Note: Questions after reading this? See our new [forum](https://meshtastic.discourse.group/).
## Uses
- Outdoor sports where cellular coverage is limited. (Hiking, Skiing, Boating, Paragliding, Gliders etc..)
- Applications where closed source GPS communicators just won't cut it (it is easy to add features for glider pilots etc...)
- Secure long-range communication within groups without depending on cellular providers
- Finding your lost kids ;-)
- Through our [python API](https://pypi.org/project/meshtastic/) use these inexpensive radios to easily add mesh networking to your own projects.
## Features
Not all of these features are fully implemented yet - see **important** disclaimers below. But they should be in by the time we decide to call this project beta (three months?)
- Very long battery life (should be about eight days with the beta software)
- Built in GPS and [LoRa](https://en.wikipedia.org/wiki/LoRa) radio, but we manage the radio automatically for you
- Long range - a few miles per node but each node will forward packets as needed
- Secure - channels are encrypted by AES256 (But see important disclaimers below wrt this feature)
- Shows direction and distance to all members of your channel
- Directed or broadcast text messages for channel members
- Open and extensible codebase supporting multiple hardware vendors - no lock in to one vendor
- Communication API for bluetooth devices (such as our Android app) to use the mesh. An iOS application is in the works. And [Meshtastic-python](https://pypi.org/project/meshtastic/) provides access from desktop computers.
- Very easy sharing of private secured channels. Just share a special link or QR code with friends and they can join your encrypted mesh
This project is currently in beta testing but it is fairly stable and feature complete - if you have questions please [join our discussion forum](https://meshtastic.discourse.group/).
This software is 100% open source and developed by a group of hobbyist experimenters. No warranty is provided, if you'd like to improve it - we'd love your help. Please post in the [forum](https://meshtastic.discourse.group/).
### Beginner's Guide
For an detailed walk-through aimed at beginners, we recommend [meshtastic.letstalkthis.com](https://meshtastic.letstalkthis.com/).
### Related Groups
Telegram group for **Italy**-based users [t.me/meshtastic_italia](http://t.me/meshtastic_italia) (Italian language, unofficial).<br/>
Telegram group for **Russian**-based users [t.me/meshtastic_russia](https://t.me/meshtastic_russia) (Russian language, unofficial).
## Updates
Note: Updates are happening almost daily, only major updates are listed below. For more details see our forum.
- 09/14/2020 - 1.0.0 Now with over 1700 android users, over 2000 nodes and translated into 15 languages. This project will always be a "beta" experiment, but now quite usable. We are currently selecting 1.1 features in our discussion forum.
- 06/24/2020 - 0.7.x Now with over 1000 android users, over 600 people using the radios and translated into 22 languages. Fairly stable and we are working through bugs to get to 1.0.
- 06/04/2020 - 0.6.7 Beta releases of both the application and the device code are released. Features are fairly solid now with a sizable number of users.
- 04/28/2020 - 0.6.0 [Python API](https://pypi.org/project/meshtastic/) released. Makes it easy to use meshtastic devices as "zero config / just works" mesh transport adapters for other projects.
- 04/20/2020 - 0.4.3 Pretty solid now both for the android app and the device code. Many people have donated translations and code. Probably going to call it a beta soon.
- 03/03/2020 - 0.0.9 of the Android app and device code is released. Still an alpha but fairly functional.
- 02/25/2020 - 0.0.4 of the Android app is released. This is a very early alpha, see below to join the alpha-testers group.
- 02/23/2020 - 0.0.4 release. Still very bleeding edge but much closer to the final power management, a charged T-BEAM should run for many days with this load. If you'd like to try it, we'd love your feedback. Click [here](https://github.com/meshtastic/Meshtastic-esp32/blob/master/README.md) for instructions.
- 02/20/2020 - Our first alpha release (0.0.3) of the radio software is ready brave early people.
### Meshtastic Android app
Our Android application is available here:
[![Download at https://play.google.com/store/apps/details?id=com.geeksville.mesh](https://play.google.com/intl/en_us/badges/static/images/badges/en_badge_web_generic.png)](https://play.google.com/store/apps/details?id=com.geeksville.mesh&referrer=utm_source%3Dgithub-homepage)
The link above will return older more stable releases. We would prefer if you join our alpha-test group, because the application is rapidly improving. Three steps to opt-in to the alpha- test:
1. Join [this Google group](https://groups.google.com/forum/#!forum/meshtastic-alpha-testers) with the account you use in Google Play.
2. Go to this [URL](https://play.google.com/apps/testing/com.geeksville.mesh) to opt-in to the alpha test.
3. If you encounter any problems or have questions, post in our [forum](https://meshtastic.discourse.group/) and we'll help.
If you'd like to help with development, the source code is [on github](https://github.com/meshtastic/Meshtastic-Android).
The app is also distributed for Amazon Fire devices via the Amazon appstore: [![Amazon appstore link](https://raw.githubusercontent.com/meshtastic/Meshtastic-device/master/images/amazon-fire-button.png)](https://www.amazon.com/Geeksville-Industries-Meshtastic/dp/B08CY9394Q)
### Supported hardware
We currently support two brands of radios. The [TTGO T-Beam](https://www.aliexpress.com/item/4001178678568.html) and the [Heltec LoRa 32](https://heltec.org/project/wifi-lora-32/). Most people should buy the T-Beam and a 18650 battery (total cost less than $35). Also, the version of the T-Beam we link to is shipped with Meshtastic **preinstalled** by TTGO, so you don't have to install it yourself.
Make sure to buy the frequency range which is legal for your country. For the USA, you should buy the 915MHz version. Getting a version that include a screen is optional, but highly recommended.
Instructions for installing prebuilt firmware can be found [here](https://github.com/meshtastic/Meshtastic-esp32/blob/master/README.md).
For a nice looking cases:
- 3D printable cases
1. TTGO T-Beam V0 see this [design](https://www.thingiverse.com/thing:3773717) by [bsiege](https://www.thingiverse.com/bsiege).
2. TTGO T_Beam V1 (SMA) see this [design](https://www.thingiverse.com/thing:3830711) by [rwanrooy](https://www.thingiverse.com/rwanrooy) or this [remix](https://www.thingiverse.com/thing:3949330) by [8ung](https://www.thingiverse.com/8ung)
3. TTGO T_Beam V1 (IPEX) see this [design](https://www.thingiverse.com/thing:4587297) by [drewsed](https://www.thingiverse.com/drewsed)
4. Heltec Lora32 see this [design](https://www.thingiverse.com/thing:3125854) by [ornotermes](https://www.thingiverse.com/ornotermes).
- Laser-cut cases
1. TTGO T_Beam V1 (SMA) see this [design](https://www.thingiverse.com/thing:4552771) by [jefish](https://www.thingiverse.com/jefish)
## IMPORTANT DISCLAIMERS AND FAQ
For a listing of currently missing features and a FAQ click [here](device/faq).

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---
id: api
title: Protobuf API Reference
sidebar_label: API
---
:::info
You are likely running this is development mode. Protobuf docs are generated by a GitHub Action
:::

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---
id: ant
title: ANT protocol notes
sidebar_label: ANT protocol
---
SD340 terms are reasonable for NRF52
<https://www.thisisant.com/developer/components/nrf52832#tab_protocol_stacks_tab>
Profiles to implement:
tracker
<https://www.thisisant.com/developer/ant-plus/device-profiles/#4365_tab>
ebike
<https://www.thisisant.com/developer/ant-plus/device-profiles/#527_tab>
no profile for messaging?

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---
id: build-instructions
title: Build Instructions
sidebar_label: Building
---
This project uses the simple PlatformIO build system. PlatformIO is an extension to Microsoft VSCode. Workflows from building from the GUI or from the commandline are listed below.
If you encounter any problems, please post a question in [our forum](https://meshtastic.discourse.group). And when you learn a fix, update these instructions for the next person (i.e. edit this file and send in a [pull-request](https://opensource.com/article/19/7/create-pull-request-github) which we will eagerly merge).
## GUI
1. Purchase a suitable [radio](https://github.com/meshtastic/Meshtastic-device/wiki/Hardware-Information).
2. Install [Python](https://www.python.org/downloads/).
3. Install [Git](https://git-scm.com/downloads).
4. Reboot your computer.
5. Install [PlatformIO](https://platformio.org/platformio-ide).
6. Click the PlatformIO icon on the side bar. ![platformio icon](https://user-images.githubusercontent.com/47490997/89482668-77c7ea00-d7ee-11ea-8785-5faf8ff99800.png)
7. Under `Quick Access, Miscellaneous, Clone Git Project` enter the URL of the Meshtastic repo found [here](https://github.com/meshtastic/Meshtastic-device). ![image](https://user-images.githubusercontent.com/47490997/89483047-4c91ca80-d7ef-11ea-91f4-1d53d4e8acd9.png)
8. Select a file location to save the repo.
9. Once loaded, open the `platformio.ini` file.
10. At the line `default_envs` you can change it to the board type you are building for ie. `tlora-v2, tlora-v1, tlora-v2-1-1.6, tbeam, heltec, tbeam0.7` (boards are listed further down in the file).
11. The hardware can be configured for different countries by adding a definition to the `configuration.h` file. `#define HW_VERSION_US` or `HW_VERSION_EU433, HW_VERSION_EU865, HW_VERSION_CN, HW_VERSION_JP`. Other country settings can be found in `MeshRadio.h`. The default is `HW_VERSION_US`.
12. Click the PlatformIO icon on the side bar. Under `Project Tasks` you can now build or upload.
Note - To get a clean build you may have to delete the auto-generated file `./.vscode/c_cpp_properties.json`, close and re-open Visual Studio and WAIT until the file is auto-generated before compiling again.
## Command Line
1. Purchase a suitable [radio](https://github.com/meshtastic/Meshtastic-device/wiki/Hardware-Information).
2. Install [PlatformIO](https://platformio.org/platformio-ide)
3. Download this git repo and cd into it:
```bash
git clone https://github.com/meshtastic/Meshtastic-device.git
cd Meshtastic-device
```
4. Run `git submodule update --init --recursive` to pull in dependencies this project needs.
5. If you are outside the USA, run "export COUNTRY=EU865" (or whatever) to set the correct frequency range for your country. Options are provided for `EU433`, `EU865`, `CN`, `JP` and `US` (default). Pull-requests eagerly accepted for other countries.
6. Plug the radio into your USB port
7. Type `pio run --environment XXX -t upload` (This command will fetch dependencies, build the project and install it on the board via USB). For XXX, use the board type you have (either `tlora-v2, tlora-v1, tlora-v2-1-1.6, tbeam, heltec, tbeam0.7`).
8. Platform IO also installs a very nice VisualStudio Code based IDE, see their [tutorial](https://docs.platformio.org/en/latest/tutorials/espressif32/arduino_debugging_unit_testing.html) if you'd like to use it.
## Decoding stack traces
### Option 1
If you get a crash, you can decode the addresses from the `Backtrace:` line:
1. Save the `Backtrace: 0x....` line to a file, e.g., `backtrace.txt`.
2. Run `bin/exception_decoder.py backtrace.txt` (this uses symbols from the
last `firmware.elf`, so you must be running the same binary that's still in
your `.pio/build` directory).
### Option 2
You can run the exception decoder to monitor the serial output and decode backtraces in real time.
1. From within PlatformIO, open a new terminal.
2. At the the terminal, enter:
`pio device monitor --port /dev/cu.SLAB_USBtoUART -f esp32_exception_decoder`
Replace the value of port with the location of your serial port.

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---
id: crypto
title: Encryption in Meshtastic
sidebar_label: Crypto
---
Cryptography is tricky, so we've tried to 'simply' apply standard crypto solutions to our implementation. However,
the project developers are not cryptography experts. Therefore we ask two things:
- If you are a cryptography expert, please review these notes and our questions below. Can you help us by reviewing our
notes below and offering advice? We will happily give as much or as little credit as you wish ;-).
- Consider our existing solution 'alpha' and probably fairly secure against a not particularly aggressive adversary
(but we can't yet make a more confident statement).
## Summary of strengths/weaknesses of our current implementation
Based on comments from reviewers (see below), here's some tips for usage of these radios. So you can know the level of protection offered:
- It is pretty likely that the AES256 security is implemented 'correctly' and an observer will not be able to decode your messages.
- Warning: If an attacker is able to get one of the radios in their posession, they could either a) extract the channel key from that device or b) use that radio to listen to new communications.
- Warning: If an attacker is able to get the "Channel QR code/URL" that you share with others - that attacker could then be able to read any messages sent on the channel (either tomorrow or in the past - if they kept a raw copy of those broadcast packets)
Possible future areas of work (if there is enough interest - post in our [forum](https://meshtastic.discourse.group) if you want this):
1. Optionally requiring users to provide a PIN to regain access to the mesh. This could be based on: intentionally locking the device, time since last use, or any member could force all members to reauthenticate,
2. Until a device reauthenticates, any other access via BLE or USB would be blocked (this would protect against attackers who are not prepared to write custom software to extract and reverse engineer meshtastic flash memory)
3. Turning on read-back protection in the device fuse-bits (this would extend protection in #2 to block all but **extremely** advanced attacks involving chip disassembly)
4. Time limiting keys used for message transmission and automatically cycling them on a schedule. This would protect past messages from being decoded even if an attacker learns the current key.
### Notes for reviewers
If you are reviewing our implementation, this is a brief statement of our method.
- We do all crypto at the SubPacket (payload) level only, so that all meshtastic nodes will route for others - even those channels which are encrypted with a different key.
- Mostly based on reading [Wikipedia](<https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Counter_(CTR)>) and using the modes the ESP32 provides support for in hardware.
- We use AES256-CTR as a stream cypher (with zero padding on the last BLOCK) because it is well supported with hardware acceleration.
- Our AES key is 128 or 256 bits, shared as part of the 'Channel' specification.
- The node number concatenated with the packet number is used as the NONCE. This nonce will be stored in flash in the device and should essentially never repeat. If the user makes a new 'Channel' (i.e. picking a new random 256 bit key), the packet number will start at zero.
- The packet number is sent in cleartext with each packet. The node number can be derived from the "from" field of each packet. (Cleartext is acceptable because it merely provides IV for each encryption run)
- Each 16 byte BLOCK for a packet has an incrementing COUNTER. COUNTER starts at zero for the first block of each packet.
- The IV for each block is constructed by concatenating the NONCE as the upper 96 bits of the IV and the COUNTER as the bottom 32 bits. Since our packets are small counter portion will really never be higher than 32 (five bits).
## Comments from reviewer #1
This reviewer is a cryptography professional, but would like to remain anonymous. We thank them for their comments ;-):
I'm assuming that meshtastic is being used to hike in places where someone capable is trying to break it - like you were going to walk around DefCon using these. I spent about an hour reviewing the encryption, and have the following notes:
- The write-up isn't quite as clear as the code.
- The code is using AES-CTR mode correctly to ensure confidentiality.
- The comment for initNonce really covers the necessary information.
- I think the bigger encryption question is "what does the encryption need to do"? As it stands, an attacker who has yet to capture any of the devices cannot reasonably capture text or location data. An attacker who captures any device in the channel/mesh can read everything going to that device, everything stored on that device, and any other communication within the channel that they captured in encrypted form. If that capability basically matches your expectations, it is suitable for whatever adventures this was intended for, then, based on information publicly available or widely disclosed, the encryption is good. If those properties are distressing (like, device history is deliberately limited and you don't want a device captured today to endanger the information sent over the channel yesterday) we could talk about ways to achieve that (most likely synchronizing time and replacing the key with its own SHA256 every X hours, and ensuring the old key is not retained unnecessarily).
- Two other things to keep in mind are that AES-CTR does not itself provide authenticity (e.g. an attacker can flip bits in replaying data and scramble the resulting plaintext), and that the current scheme gives some hints about transmission in the size. So, if you worry about an adversary deliberately messing-up messages or knowing the length of a text message, it looks like those might be possible.
I'm guessing that the network behaves somewhat like a store-and-forward network - or, at least, that the goal is to avoid establishing a two-way connection to transmit data. I'm afraid I haven't worked with mesh networks much, but remember studying them briefly in school about ten years ago.

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---
id: device-api
title: Bluetooth/serial/TCP protocol API
sidebar_label: Device API
---
(This document describes the protocol for external API clients using our devices. If you are interested in running your own code on the device itself, see the [on-device](plugin-api.md) documentation instead)
The Device API is design to have only a simple stream of ToRadio and FromRadio packets and all polymorphism comes from the flexible set of Google Protocol Buffers which are sent over the wire. We use protocol buffers extensively both for the bluetooth API and for packets inside the mesh or when providing packets to other applications on the phone.
## Streaming version
This protocol is **almost** identical when it is deployed over BLE, Serial/USB or TCP (our three currently supported transports for connecting to phone/PC). Most of this document is in terms of the original BLE version, but this section describes the small changes when this API is exposed over a Streaming (non datagram) transport. The streaming version has the following changes:
- We assume the stream is reliable (though the protocol will resynchronize if bytes are lost or corrupted). i.e. we do not include CRCs or error correction codes.
- Packets always have a four byte header (described below) prefixed before each packet. This header provides framing characters and length.
- The stream going towards the radio is only a series of ToRadio packets (with the extra 4 byte headers)
- The stream going towards the PC is a stream of FromRadio packets (with the 4 byte headers), or if the receiver state machine does not see valid header bytes it can (optionally) print those bytes as the debug console from the radio. This allows the device to emit regular serial debugging messages (which can be understood by a terminal program) but also switch to a more structured set of protobufs once it sees that the PC client has sent a protobuf towards it.
The 4 byte header is constructed to both provide framing and to not look line 'normal' 7 bit ASCII.
- Byte 0: START1 (0x94)
- Byte 1: START2 (0xc3)
- Byte 2: MSB of protobuf length
- Byte 3: LSB of protobuf length
The receiver will validate length and if >512 it will assume the packet is corrupted and return to looking for START1. While looking for START1 any other characters are printed as "debug output". For small example implementation of this reader see the meshtastic-python implementation.
## MeshBluetoothService (the BLE API)
This is the main bluetooth service for the device and provides the API your app should use to get information about the mesh, send packets or provision the radio.
For a reference implementation of a client that uses this service see [RadioInterfaceService](https://github.com/meshtastic/Meshtastic-Android/blob/master/app/src/main/java/com/geeksville/mesh/service/RadioInterfaceService.kt).
Typical flow when a phone connects to the device should be the following (if you want to watch this flow from the python app just run "meshtastic --debug --info" - the flow over BLE is identical):
- There are only three relevant endpoints (and they have built in BLE documentation - so use a BLE tool of your choice to watch them): FromRadio, FromNum (sends notifies when new data is available in FromRadio) and ToRadio
- SetMTU size to 512
- Write a ToRadio.startConfig protobuf to the "ToRadio" endpoint" - this tells the radio you are a new connection and you need the entire NodeDB sent down.
- Read repeatedly from the "FromRadio" endpoint. Each time you read you will get back a FromRadio protobuf (see Meshtatastic-protobuf). Keep reading from this endpoint until you get back and empty buffer.
- See below for the expected sequence for your initial download.
- After the initial download, you should subscribe for BLE "notify" on the "FromNum" endpoint. If a notification arrives, that means there are now one or more FromRadio packets waiting inside FromRadio. Read from FromRadio until you get back an empty packet.
- Any time you want to send packets to the radio, you should write a ToRadio packet into ToRadio.
Expected sequence for initial download:
- After your send startConfig, you will receive a series of FromRadio packets. The sequence of these packets will be as follows (but you are best not counting on this, instead just update your model for whatever packet you receive - based on looking at the type)
- Read a RadioConfig from "radio" - used to get the channel and radio settings
- Read a User from "user" - to get the username for this node
- Read a MyNodeInfo from "mynode" to get information about this local device
- Read a series of NodeInfo packets to build the phone's copy of the current NodeDB for the mesh
- Read a endConfig packet that indicates that the entire state you need has been sent.
- Read a series of MeshPackets until it returns empty to get any messages that arrived for this node while the phone was away
For definitions (and documentation) on FromRadio, ToRadio, MyNodeInfo, NodeInfo and User protocol buffers see [mesh.proto](https://github.com/meshtastic/Meshtastic-protobufs/blob/master/mesh.proto)
UUID for the service: 6ba1b218-15a8-461f-9fa8-5dcae273eafd
Each characteristic is listed as follows:
UUID
Properties
Description (including human readable name)
8ba2bcc2-ee02-4a55-a531-c525c5e454d5
read
fromradio - contains a newly received FromRadio packet destined towards the phone (up to MAXPACKET bytes per packet).
After reading the esp32 will put the next packet in this mailbox. If the FIFO is empty it will put an empty packet in this
mailbox.
f75c76d2-129e-4dad-a1dd-7866124401e7
write
toradio - write ToRadio protobufs to this characteristic to send them (up to MAXPACKET len)
ed9da18c-a800-4f66-a670-aa7547e34453
read,notify,write
fromnum - the current packet # in the message waiting inside fromradio, if the phone sees this notify it should read messages
until it catches up with this number.
The phone can write to this register to go backwards up to FIXME packets, to handle the rare case of a fromradio packet was dropped after the esp32 callback was called, but before it arrives at the phone. If the phone writes to this register the esp32 will discard older packets and put the next packet >= fromnum in fromradio.
When the esp32 advances fromnum, it will delay doing the notify by 100ms, in the hopes that the notify will never actally need to be sent if the phone is already pulling from fromradio.
Note: that if the phone ever sees this number decrease, it means the esp32 has rebooted.
Re: queue management
Not all messages are kept in the fromradio queue (filtered based on SubPacket):
- only the most recent Position and User messages for a particular node are kept
- all Data SubPackets are kept
- No WantNodeNum / DenyNodeNum messages are kept
A variable keepAllPackets, if set to true will suppress this behavior and instead keep everything for forwarding to the phone (for debugging)
### A note on MTU sizes
This device will work with any MTU size, but it is highly recommended that you call your phone's "setMTU function to increase MTU to 512 bytes" as soon as you connect to a service. This will dramatically improve performance when reading/writing packets.
### Protobuf API
On connect, you should send a want_config_id protobuf to the device. This will cause the device to send its node DB and radio config via the fromradio endpoint. After sending the full DB, the radio will send a want_config_id to indicate it is done sending the configuration.
### Other bluetooth services
This document focuses on the core device protocol, but it is worth noting that the following other Bluetooth services are also
provided by the device.
#### BluetoothSoftwareUpdate
The software update service. For a sample function that performs a software update using this API see [startUpdate](https://github.com/meshtastic/Meshtastic-Android/blob/master/app/src/main/java/com/geeksville/mesh/service/SoftwareUpdateService.kt).
SoftwareUpdateService UUID cb0b9a0b-a84c-4c0d-bdbb-442e3144ee30
Characteristics
| UUID | properties | description |
| ------------------------------------ | ----------- | ----------------------------------------------------------------------------------------------------------------- |
| e74dd9c0-a301-4a6f-95a1-f0e1dbea8e1e | write,read | total image size, 32 bit, write this first, then read read back to see if it was acceptable (0 mean not accepted) |
| e272ebac-d463-4b98-bc84-5cc1a39ee517 | write | data, variable sized, recommended 512 bytes, write one for each block of file |
| 4826129c-c22a-43a3-b066-ce8f0d5bacc6 | write | crc32, write last - writing this will complete the OTA operation, now you can read result |
| 5e134862-7411-4424-ac4a-210937432c77 | read,notify | result code, readable but will notify when the OTA operation completes |
| 5e134862-7411-4424-ac4a-210937432c67 | write | sets the region for programming, currently only 0 (app) or 100 (spiffs) are defined, if not set app is assumed |
| GATT_UUID_SW_VERSION_STR/0x2a28 | read | We also implement these standard GATT entries because SW update probably needs them: |
| GATT_UUID_MANU_NAME/0x2a29 | read | |
| GATT_UUID_HW_VERSION_STR/0x2a27 | read | |
#### DeviceInformationService
Implements the standard BLE contract for this service (has software version, hardware model, serial number, etc...)
#### BatteryLevelService
Implements the standard BLE contract service, provides battery level in a way that most client devices should automatically understand (i.e. it should show in the bluetooth devices screen automatically)

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---
id: esp32-arduino-build-notes
title: esp32-arduino build instructions
sidebar_label: Building esp32-arduino
---
We build our own custom version of esp32-arduino, in order to get some fixes we've made but haven't yet been merged in master.
These are a set of currently unformatted notes on how to build and install them. Most developers should not care about this, because
you'll automatically get our fixed libraries.
```bash
//last EDF release in arduino is: https://github.com/espressif/arduino-esp32/commit/1977370e6fc069e93ffd8818798fbfda27ae7d99<br/>
//IDF release/v3.3 46b12a560
//IDF release/v3.3 367c3c09c
//https://docs.espressif.com/projects/esp-idf/en/release-v3.3/get-started/linux-setup.html
python /home/kevinh/development/meshtastic/
cp -a out/tools/sdk/* components/arduino/tools/sdk
cp -ar components/arduino/* ~/.platformio/packages/framework-arduinoespressif32
/// @src-fba9d33740f719f712e9f8b07da6ea13/
or
cp -ar out/tools/sdk/* ~/.platformio/packages/framework-arduinoespressif32/tools/sdk
```
How to flash new bootloader
```bash
esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 921600 --before default_reset --after hard_reset write_flash -z --flash_mode dout --flash_freq 40m --flash_size detect 0x1000 /home/kevinh/development/meshtastic/esp32-arduino-lib-builder/build/bootloader/bootloader.bin
```

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---
id: install-OSX
title: OSX Install
sidebar_label: OSX
---
(Here's some quick tips on installing the device code from OS-X, thanks to @android606)
First time using LoRa for anything, just checking it out.
I bought a T-Beam on eBay, followed the instructions to install the firmware here:
[https://github.com/meshtastic/Meshtastic-esp32](https://github.com/meshtastic/Meshtastic-esp32)
I'm using a Mac for this, so that might account for differences in the steps to get it working. I just swapped out my SSD last month, I'm using a pretty fresh install of OS X 10.15.3/Catalina.
I got it working fairly smoothly, but there were two hang-ups I thought I'd mention:
1. I am about 0% familiar with Python, so there were some issues getting esptool.py working. Basically, this OS X comes with Python 2.7 and no pip. Pip installed okay, so I used it to install esptool. Esptool appeared to install correctly, but I couldn't get it to work to save my life. Simply typing "esptool.py" doesn't work, and I just don't know enough python to figure out why. For some reason, it installs but isn't in the \$PATH anywhere, and I don't know where it went. Python 2.7 kept giving me warning messages about being old and unsupported, so I figured that might be a hint that I should upgrade.
I ended up doing this:
- brew install pyenv (to install pyenv)
- pyenv install 3.7.7 (to install and select python 3.7.7)
- pyenv global 3.7.7 (to select the new version of python)
- brew install pip (to install pip3)
- pip3 install --upgrade esptool (note I specifically had to use "pip3", not "pip")
...then I was able to execute esptool.py
2. esptool.py didn't work though, because the virtual com port wasn't showing up as a device. I had to install a driver from Silicon Labs, which I got here:
[driver for the CP210X USB to UART bridge from Silicon Labs](https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers)
After I installed that, esptool.py was completely happy and the firmware loaded right up.

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---
id: mesh-alg
title: Mesh broadcast algorithm
sidebar_label: Mesh algorithm
---
## Current algorithm
The routing protocol for Meshtastic is really quite simple (and suboptimal). It is heavily influenced by the mesh routing algorithm used in [Radiohead](https://www.airspayce.com/mikem/arduino/RadioHead/) (which was used in very early versions of this project). It has four conceptual layers.
### A note about protocol buffers
Because we want our devices to work across various vendors and implementations, we use [Protocol Buffers](https://github.com/meshtastic/Meshtastic-protobufs) pervasively. For information on how the protocol buffers are used wrt API clients see [sw-design](sw-design.md), for purposes of this document you mostly only
need to consider the MeshPacket and Subpacket message types.
### Layer 1: Non reliable zero hop messaging
This layer is conventional non-reliable lora packet transmission. The transmitted packet has the following representation on the ether:
- A 32 bit LORA preamble (to allow receiving radios to synchronize clocks and start framing). We use a longer than minimum (8 bit) preamble to maximize the amount of time the LORA receivers can stay asleep, which dramatically lowers power consumption.
After the preamble the 16 byte packet header is transmitted. This header is described directly by the PacketHeader class in the C++ source code. But indirectly it matches the first portion of the "MeshPacket" protobuf definition. But notably: this portion of the packet is sent directly as the following 16 bytes (rather than using the protobuf encoding). We do this to both save airtime and to allow receiving radio hardware the option of filtering packets before even waking the main CPU.
- to (4 bytes): the unique NodeId of the destination (or 0xffffffff for NodeNum_BROADCAST)
- from (4 bytes): the unique NodeId of the sender)
- id (4 bytes): the unique (wrt the sending node only) packet ID number for this packet. We use a large (32 bit) packet ID to ensure there is enough unique state to protect any encrypted payload from attack.
- flags (4 bytes): Only a few bits are are currently used - 3 bits for for the "HopLimit" (see below) and 1 bit for "WantAck"
After the packet header the actual packet is placed onto the the wire. These bytes are merely the encrypted packed protobuf encoding of the SubPacket protobuf. A full description of our encryption is available in [crypto](crypto.md). It is worth noting that only this SubPacket is encrypted, headers are not. Which leaves open the option of eventually allowing nodes to route packets without knowing the keys used to encrypt.
NodeIds are constructed from the bottom four bytes of the macaddr of the bluetooth address. Because the OUI is assigned by the IEEE and we currently only support a few CPU manufacturers, the upper byte is defacto guaranteed unique for each vendor. The bottom 3 bytes are guaranteed unique by that vendor.
To prevent collisions all transmitters will listen before attempting to send. If they hear some other node transmitting, they will reattempt transmission in x milliseconds. This retransmission delay is random between FIXME and FIXME (these two numbers are currently hardwired, but really should be scaled based on expected packet transmission time at current channel settings).
### Layer 2: Reliable zero hop messaging
This layer adds reliable messaging between the node and its immediate neighbors (only).
The default messaging provided by layer-1 is extended by setting the "want-ack" flag in the MeshPacket protobuf. If want-ack is set the following documentation from mesh.proto applies:
"""This packet is being sent as a reliable message, we would prefer it to arrive
at the destination. We would like to receive a ack packet in response.
Broadcasts messages treat this flag specially: Since acks for broadcasts would
rapidly flood the channel, the normal ack behavior is suppressed. Instead,
the original sender listens to see if at least one node is rebroadcasting this
packet (because naive flooding algorithm). If it hears that the odds (given
typical LoRa topologies) the odds are very high that every node should
eventually receive the message. So FloodingRouter.cpp generates an implicit
ack which is delivered to the original sender. If after some time we don't
hear anyone rebroadcast our packet, we will timeout and retransmit, using the
regular resend logic."""
If a transmitting node does not receive an ACK (or a NAK) packet within FIXME milliseconds, it will use layer-1 to attempt a retransmission of the sent packet. A reliable packet (at this 'zero hop' level) will be resent a maximum of three times. If no ack or nak has been received by then the local node will internally generate a nak (either for local consumption or use by higher layers of the protocol).
### Layer 3: (Naive) flooding for multi-hop messaging
Given our use-case for the initial release, most of our protocol is built around [flooding](<https://en.wikipedia.org/wiki/Flooding_(computer_networking)>). The implementation is currently 'naive' - i.e. it doesn't try to optimize flooding other than abandoning retransmission once we've seen a nearby receiver has acked the packet. Therefore, for each source packet up to N retransmissions might occur (if there are N nodes in the mesh).
Each node in the mesh, if it sees a packet on the ether with HopLimit set to a value other than zero, it will decrement that HopLimit and attempt retransmission on behalf of the original sending node.
### Layer 4: DSR for multi-hop unicast messaging
This layer is not yet fully implemented (and not yet used). But eventually (if we stay with our own transport rather than switching to QMesh or Reticulum)
we will use conventional DSR for unicast messaging. Currently (even when not requiring 'broadcasts') we send any multi-hop unicasts as 'broadcasts' so that we can
leverage our (functional) flooding implementation. This is suboptimal but it is a very rare use-case, because the odds are high that most nodes (given our small networks and 'hiking' use case) are within a very small number of hops. When any node witnesses an ack for a packet, it will realize that it can abandon its own
broadcast attempt for that packet.
## Misc notes on remaining tasks
This section is currently poorly formatted, it is mostly a mere set of todo lists and notes for @geeksville during his initial development. After release 1.0 ideas for future optimization include:
- Make flood-routing less naive (because we have GPS and radio signal strength as heuristics to avoid redundant retransmissions)
- If nodes have been user marked as 'routers', preferentially do flooding via those nodes
- Fully implement DSR to improve unicast efficiency (or switch to QMesh/Reticulum as these projects mature)
great source of papers and class notes: <http://www.cs.jhu.edu/~cs647/>
flood routing improvements
- DONE if we don't see anyone rebroadcast our want_ack=true broadcasts, retry as needed.
reliable messaging tasks (stage one for DSR):
- DONE generalize naive flooding
- DONE add a max hops parameter, use it for broadcast as well (0 means adjacent only, 1 is one forward etc...). Store as three bits in the header.
- DONE add a 'snoopReceived' hook for all messages that pass through our node.
- DONE use the same 'recentmessages' array used for broadcast msgs to detect duplicate retransmitted messages.
- DONE in the router receive path?, send an ack packet if want_ack was set and we are the final destination. FIXME, for now don't handle multihop or merging of data replies with these acks.
- DONE keep a list of packets waiting for acks
- DONE for each message keep a count of # retries (max of three). Local to the node, only for the most immediate hop, ignorant of multihop routing.
- DONE delay some random time for each retry (large enough to allow for acks to come in)
- DONE once an ack comes in, remove the packet from the retry list and deliver the ack to the original sender
- DONE after three retries, deliver a no-ack packet to the original sender (i.e. the phone app or mesh router service)
- DONE test one hop ack/nak with the python framework
- DONE Do stress test with acks
dsr tasks
- DONE oops I might have broken message reception
- DONE Don't use broadcasts for the network pings (close open github issue)
- DONE add ignoreSenders to radioconfig to allow testing different mesh topologies by refusing to see certain senders
- DONE test multihop delivery with the python framework
optimizations / low priority:
- read this [this](http://pages.cs.wisc.edu/~suman/pubs/nadv-mobihoc05.pdf) paper and others and make our naive flood routing less naive
- read @cyclomies long email with good ideas on optimizations and reply
- DONE Remove NodeNum assignment algorithm (now that we use 4 byte node nums)
- DONE make android app warn if firmware is too old or too new to talk to
- change nodenums and packetids in protobuf to be fixed32
- low priority: think more careful about reliable retransmit intervals
- make ReliableRouter.pending threadsafe
- bump up PacketPool size for all the new ack/nak/routing packets
- handle 51 day rollover in doRetransmissions
- use a priority queue for the messages waiting to send. Send acks first, then routing messages, then data messages, then broadcasts?
when we send a packet
- do "hop by hop" routing
- when sending, if destnodeinfo.next_hop is zero (and no message is already waiting for an arp for that node), startRouteDiscovery() for that node. Queue the message in the 'waiting for arp queue' so we can send it later when then the arp completes.
- otherwise, use next_hop and start sending a message (with ack request) towards that node (starting with next_hop).
when we receive any packet
- sniff and update tables (especially useful to find adjacent nodes). Update user, network and position info.
- if we need to route() that packet, resend it to the next_hop based on our nodedb.
- if it is broadcast or destined for our node, deliver locally
- handle routereply/routeerror/routediscovery messages as described below
- then free it
routeDiscovery
- if we've already passed through us (or is from us), then it ignore it
- use the nodes already mentioned in the request to update our routing table
- if they were looking for us, send back a routereply
- NOT DOING FOR NOW -if max_hops is zero and they weren't looking for us, drop (FIXME, send back error - I think not though?)
- if we receive a discovery packet, and we don't have next_hop set in our nodedb, we use it to populate next_hop (if needed) towards the requester (after decrementing max_hops)
- if we receive a discovery packet, and we have a next_hop in our nodedb for that destination we send a (reliable) we send a route reply towards the requester
when sending any reliable packet
- if timeout doing retries, send a routeError (nak) message back towards the original requester. all nodes eavesdrop on that packet and update their route caches.
when we receive a routereply packet
- update next_hop on the node, if the new reply needs fewer hops than the existing one (we prefer shorter paths). fixme, someday use a better heuristic
when we receive a routeError packet
- delete the route for that failed recipient, restartRouteDiscovery()
- if we receive routeerror in response to a discovery,
- fixme, eventually keep caches of possible other routes.
TODO:
- optimize our generalized flooding with heuristics, possibly have particular nodes self mark as 'router' nodes.
- DONE reread the radiohead mesh implementation - hop to hop acknowledgement seems VERY expensive but otherwise it seems like DSR
- DONE read about mesh routing solutions (DSR and AODV)
- DONE read about general mesh flooding solutions (naive, MPR, geo assisted)
- DONE reread the disaster radio protocol docs - seems based on Babel (which is AODVish)
- REJECTED - seems dying - possibly dash7? <https://www.slideshare.net/MaartenWeyn1/dash7-alliance-protocol-technical-presentation> <https://github.com/MOSAIC-LoPoW/dash7-ap-open-source-stack> - does the opensource stack implement multihop routing? flooding? their discussion mailing list looks dead-dead
- update duty cycle spreadsheet for our typical usecase
a description of DSR: <https://t>ools.ietf.org/html/rfc4728 good slides here: <https://www.slideshare.net/ashrafmath/dynamic-source-routing>
good description of batman protocol: <https://www.open-mesh.org/projects/open-mesh/wiki/BATMANConcept>
interesting paper on lora mesh: <https://portal.research.lu.se/portal/files/45735775/paper.pdf>
It seems like DSR might be the algorithm used by RadioheadMesh. DSR is described in <https://tools.ietf.org/html/rfc4728>
<https://en.wikipedia.org/wiki/Dynamic_Source_Routing>
broadcast solution:
Use naive flooding at first (FIXME - do some math for a 20 node, 3 hop mesh. A single flood will require a max of 20 messages sent)
Then move to MPR later (<http://www.olsr.org/docs/report_html/node28.html>). Use altitude and location as heursitics in selecting the MPR set
compare to db sync algorithm?
what about never flooding gps broadcasts. instead only have them go one hop in the common case, but if any node X is looking at the position of Y on their gui, then send a unicast to Y asking for position update. Y replies.
If Y were to die, at least the neighbor nodes of Y would have their last known position of Y.
## approach 1
- send all broadcasts with a TTL
- periodically(?) do a survey to find the max TTL that is needed to fully cover the current network.
- to do a study first send a broadcast (maybe our current initial user announcement?) with TTL set to one (so therefore no one will rebroadcast our request)
- survey replies are sent unicast back to us (and intervening nodes will need to keep the route table that they have built up based on past packets)
- count the number of replies to this TTL 1 attempt. That is the number of nodes we can reach without any rebroadcasts
- repeat the study with a TTL of 2 and then 3. stop once the # of replies stops going up.
- it is important for any node to do listen before talk to prevent stomping on other rebroadcasters...
- For these little networks I bet a max TTL would never be higher than 3?
## approach 2
- send a TTL1 broadcast, the replies let us build a list of the nodes (stored as a bitvector?) that we can see (and their rssis)
- we then broadcast out that bitvector (also TTL1) asking "can any of ya'll (even indirectly) see anyone else?"
- if a node can see someone I missed (and they are the best person to see that node), they reply (unidirectionally) with the missing nodes and their rssis (other nodes might sniff (and update their db) based on this reply but they don't have to)
- given that the max number of nodes in this mesh will be like 20 (for normal cases), I bet globally updating this db of "nodenums and who has the best rssi for packets from that node" would be useful
- once the global DB is shared, when a node wants to broadcast, it just sends out its broadcast . the first level receivers then make a decision "am I the best to rebroadcast to someone who likely missed this packet?" if so, rebroadcast
## approach 3
- when a node X wants to know other nodes positions, it broadcasts its position with want_replies=true. Then each of the nodes that received that request broadcast their replies (possibly by using special timeslots?)
- all nodes constantly update their local db based on replies they witnessed.
- after 10s (or whatever) if node Y notices that it didn't hear a reply from node Z (that Y has heard from recently ) to that initial request, that means Z never heard the request from X. Node Y will reply to X on Z's behalf.
- could this work for more than one hop? Is more than one hop needed? Could it work for sending messages (i.e. for a msg sent to Z with want-reply set).
## approach 4
look into the literature for this idea specifically.
- don't view it as a mesh protocol as much as a "distributed db unification problem". When nodes talk to nearby nodes they work together
to update their nodedbs. Each nodedb would have a last change date and any new changes that only one node has would get passed to the
other node. This would nicely allow distant nodes to propogate their position to all other nodes (eventually).
- handle group messages the same way, there would be a table of messages and time of creation.
- when a node has a new position or message to send out, it does a broadcast. All the adjacent nodes update their db instantly (this handles 90% of messages I'll bet).
- Occasionally a node might broadcast saying "anyone have anything newer than time X?" If someone does, they send the diffs since that date.
- essentially everything in this variant becomes broadcasts of "request db updates for >time X - for _all_ or for a particular nodenum" and nodes sending (either due to request or because they changed state) "here's a set of db updates". Every node is constantly trying to
build the most recent version of reality, and if some nodes are too far, then nodes closer in will eventually forward their changes to the distributed db.
- construct non ambigious rules for who broadcasts to request db updates. ideally the algorithm should nicely realize node X can see most other nodes, so they should just listen to all those nodes and minimize the # of broadcasts. the distributed picture of nodes rssi could be useful here?
- possibly view the BLE protocol to the radio the same way - just a process of reconverging the node/msgdb database.

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---
id: mqtt
title: MQTT
sidebar_label: MQTT
---
## Abstract
:::note
This is a mini-doc/RFC sketching out a development plan to satisfy a number of 1.1 goals.
:::
- [MQTT](https://opensource.com/article/18/6/mqtt) internet accessible API. Issue #[369](https://github.com/meshtastic/Meshtastic-device/issues/169)
- An open API to easily run custom mini-apps on the devices
- A text messaging bridge when a node in the mesh can gateway to the internet. Issue #[353](https://github.com/meshtastic/Meshtastic-device/issues/353) and this nicely documented [android issue](https://github.com/meshtastic/Meshtastic-Android/issues/2).
- An easy way to let desktop app developers remotely control GPIOs. Issue #[182](https://github.com/meshtastic/Meshtastic-device/issues/182)
- Remote attribute access (to change settings of distant nodes). Issue #182
## Short term goals
- We want a clean API for novice developers to write mini "apps" that run **on the device** with the existing messaging/location "apps".
- We want the ability to have a gateway web service, so that if any node in the mesh can connect to the internet (via its connected phone app or directly) then that node will provide bidirectional messaging between nodes and the internet.
- We want an easy way for novice developers to remotely read and control GPIOs (because this is an often requested use case), without those developers having to write any device code.
- We want a way to gateway text messaging between our current private meshes and the broader internet (when that mesh is able to connect to the internet)
- We want a way to remotely set any device/channel parameter on a node. This is particularly important for administering physically inaccessible router nodes. Ideally this mechanism would also be used for administering the local node (so one common mechanism for both cases).
- This work should be independent of our current (semi-custom) LoRa transport, so that in the future we can swap out that transport if we wish (to QMesh or Reticulum?)
- Our networks are (usually) very slow and low bandwidth, so the messaging must be very airtime efficient.
## Long term goals
- Store and forward messaging should be supported, so apps can send messages that might be delivered to their destination in **hours** or **days** if a node/mesh was partitioned.
## Multiple Channel support / Security
Mini-apps API can bind to particular channels. They will only see messages sent on that channel.
During the 1.0 timeframe only one channel was supported per node. Starting in the 1.1 tree we will do things like "remote admin operations / channel settings etc..." are on the "Control" channel and only especially trusted users should have the keys to access that channel.
FIXME - explain this more, talk about how useful for users and security domains.
- add channels as security
## On device API
For information on the related on-device API see [here](device-api.md).
## MQTT transport
Any gateway-device will contact the MQTT broker.
### Topics
The "mesh/crypt/CHANNELID/NODEID/PORTID" [topic](https://www.hivemq.com/blog/mqtt-essentials-part-5-mqtt-topics-best-practices/) will be used for messages sent from/to a mesh.
Gateway nodes will foward any MeshPacket from a local mesh channel with uplink_enabled. The packet (encapsulated in a ServiceEnvelope) will remain encrypted with the key for the specified channel.
For any channels in the local node with downlink_enabled, the gateway node will forward packets from MQTT to the local mesh. It will do this by subscribing to mesh/crypt/CHANNELID/# and forwarding relevant packets.
If the channelid 'well known'/public it could be decrypted by a web service (if the web service was provided with the associated channel key), in which case it will be decrypted by a web service and appear at "mesh/clear/CHANNELID/NODEID/PORTID". Note: This is not in the initial deliverable.
FIXME, discuss how text message global mirroring could scale (or not)
FIXME, possibly don't global mirror text messages - instead rely on matrix/riot?
FIXME, discuss possible attacks by griefers and how they can be prvented
#### Service Envelope
The payload published on mesh/... will always be wrapped in a [ServiceEnvelope protobuf](https://github.com/meshtastic/Meshtastic-protobufs/blob/master/docs/docs.md#.ServiceEnvelope).
ServiceEnvelope will include the message, and full information about arrival time, who forwarded it, source channel, source mesh id, etc...
#### NODEID
The unique ID for a node. A hex string that starts with a ! symbol.
#### USERID
A user ID string. This string is either a user ID if known or a nodeid to simply deliver the message to whoever the local user is of a particular device (i.e. person who might see the screen). FIXME, see what riot.im uses and perhaps use that convention? Or use the signal +phone number convention? Or the email addr?
#### CHANNELID
FIXME, figure out how channelids work
### Gateway nodes
Any meshtastic node that has a direct connection to the internet (either via a helper app or installed wifi/4G/satellite hardware) can function as a "Gateway node".
Gateway nodes (via code running in the phone) will contain two tables to whitelist particular traffic to either be delivered toward the internet, or down toward the mesh. Users that are developing custom apps will be able to customize these filters/subscriptions.
Since multiple gateway nodes might be connected to a single mesh, it is possible that duplicate messages will be published on any particular topic. Therefore subscribers to these topics should
deduplicate if needed by using the packet ID of each message.
### Optional web services
#### Public MQTT broker service
An existing public [MQTT broker](https://mosquitto.org/) will be the default for this service, but clients can use any MQTT broker they choose.
FIXME - figure out how to avoid impersonation (because we are initially using a public mqtt server with no special security options). FIXME, include some ideas on this in the ServiceEnvelope documentation.
#### Riot.im messaging bridge
@Geeksville will run a riot.im bridge that talks to the public MQTT broker and sends/receives into the riot.im network.
There is apparently [already](https://github.com/derEisele/tuple) a riot.im [bridge](https://matrix.org/bridges/) for MQTT. That will possibly need to be customized a bit. But by doing this, we should be able to let random riot.im users send/receive messages to/from any meshtastic device. (FIXME ponder security). See this [issue](https://github.com/meshtastic/Meshtastic-Android/issues/2#issuecomment-645660990) with discussion with the dev.
### Deprecated concepts
:::caution
All of the folowing concepts have been deprecated
:::
You can ignore these for now...
#### MESHID (deprecated)
Earlier drafts of this document included the concept of a MESHID. That concept has been removed for now, but might be useful in the future. The old idea is listed below:
A unique ID for this mesh. There will be some sort of key exchange process so that the mesh ID can not be impersonated by other meshes.
#### DESTCLASS (deprecated)
Earlier drafts of this document included the concept of a DESTCLASS. That concept has been removed for now, but might be useful in the future. The old idea is listed below:
The type of DESTID this message should be delivered to. A short one letter sequence:
| Symbol | Description |
| ------ | ------------------------------------------------------------- |
| R | riot.im |
| L | local mesh node ID or ^all |
| A | an application specific message, ID will be an APP ID |
| S | SMS gateway, DESTID is a phone number to reach via Twilio.com |
| E | Emergency message, see bug #fixme for more context |
#### DESTID (deprecated)
Earlier drafts of this document included the concept of a DESTCLASS. That concept has been removed for now, but might be useful in the future. The old idea is listed below:
Can be...
- an internet username: kevinh@geeksville.com
- ^ALL for anyone
- An app ID (to allow apps out in the web to receive arbitrary binary data from nodes or simply other apps using meshtastic as a transport). They would connect to the MQTT broker and subscribe to their topic
## Rejected idea: RAW UDP
:::warning
This idea has been rejected
:::
A number of commenters have requested/proposed using UDP for the transport. We've considered this option and decided to use MQTT instead for the following reasons:
- Most UDP uses cases would need to have a server anyways so that nodes can reach each other from anywhere (i.e. if most gateways will be behind some form of NAT which would need to be tunnelled)
- Raw UDP is dropped **very** agressively by many cellular providers. MQTT from the gateway to a broker can be done over a TCP connection for this reason.
- MQTT provides a nice/documented/standard security model to build upon
- MQTT is fairly wire efficient with multiple broker implementations/providers and numerous client libraries for any language. The actual implementation of MQTT is quite simple.
## Development plan
Given the previous problem/goals statement, here's the initial thoughts on the work items required. As this idea becomes a bit more fully baked we should add details
on how this will be implemented and guesses at approximate work items.
### Work items
- Change nodeIDs to be base64 instead of eight hex digits.
- DONE Refactor the position features into a position "mini-app". Use only the new public on-device API to implement this app.
- DONE Refactor the on device texting features into a messaging "mini-app". (Similar to the position mini-app)
- Add new multi channel concept
- Send new channels to python client
- Let python client add channels
- Add portion of channelid to the raw lora packet header
- Confirm that we can now forward encrypted packets without decrypting at each node
- Use a channel named "remotehw" to secure the GPIO service. If that channel is not found, don't even start the service. Document this as the standard method for securing services.
- Add first cut of the "gateway node" code (i.e. MQTT broker client) to the python API (very little code needed for this component)
- Confirm that texting works to/from the internet
- Confirm that positions are optionally sent to the internet
- Add the first cut of the "gateway node" code to the android app (very little code needed for this component)
### Enhancements in following releases
The initial gateway will be added to the python tool. But the gateway implementation is designed to be fairly trivial/dumb. After the initial release the actual gateway code can be ported to also run inside of the android app. In fact, we could have ESP32 based nodes include a built-in "gateway node" implementation.
Store and forward could be added so that nodes on the mesh could deliver messages (i.e. text messages) on an "as possible" basis. This would allow things like "hiker sends a message to friend - mesh can not currently reach friend - eventually (days later) mesh can somehow reach friend, message gets delivered"

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---
id: nrf52-TODO
title: NRF52 TODO
sidebar_label: NRF52
---
- Possibly switch from softdevice to Apachy Newt: <https://github.com/espressif/esp-nimble>
<https://github.com/apache/mynewt-core> - use nimble BLE on both ESP32 and NRF52
## RAK815
### PPR1 TODO
- V_BK for the GPS should probably be supplied from something always on
- use S113 soft device 7.2.0
- properly test charge controller config and read battery/charge status
- fix bluetooth
- fix LCD max contrast (currently too high, needs to be about 40?)
- save brightness settings in flash
- make ST7567Wire driver less ugly, move OLED stuff into a common class treee
- add LCD power save mode for lcd per page 31 of datasheet
- add LCD power off sequence per datasheet to lcd driver
- leave LCD screen on most of the time (because it needs little power)
### general nrf52 TODO
- turn off transitions on eink screens
- change update interval on eink from 1/sec frames to one frame every 5 mins
- enter SDS state at correct time (to protect battery or loss of phone contact)
- show screen on eink when we enter SDS state (with app info and say sleeping)
- require button press to pair
- shrink soft device RAM usage
- get nrf52832 working again (currently OOM)
- i2c gps comms not quite right
- ble: AdafruitBluefruit::begin - adafruit_ble_task was assigned an invalid stack pointer. out of memory?
- measure power draw
### Bootloader
Install our (temporarily hacked up) adafruit bootloader
```bash
make BOARD=rak815 sd flash
```
Then
```bash
nrfjprog --program _build/build-rak815/rak815_bootloader-0.3.2-111-g9478eb7-dirty-nosd.hex --sectoranduicrerase -f nrf52 --reset
```
### Appload
tips on installing <https://github.com/platformio/platform-nordicnrf52/issues/8#issuecomment-374017768>
to see console output over jlink, in one tab run:
```bash
bin/nrf52832-gdbserver.sh
```
In another, run:
```bash
bin/nrf52-console.sh
```
On NRF52 I've been using the jlink fake serial console. But since the rak815 has the serial port hooked up we can switch back to that once the basics are working.
## Misc work items
RAM investigation.
nRF52832-QFAA 64KB ram, 512KB flash vs
nrf52832-QFAB 32KB ram, 512kb flash
nrf52833 128KB RAM
nrf52840 256KB RAM, 1MB flash
Manual hacks needed to build (for now):
kevinh@kevin-server:~/.platformio/packages/framework-arduinoadafruitnrf52/variants\$ ln -s ~/development/meshtastic/meshtastic-esp32/variants/\* .
## Initial work items
Minimum items needed to make sure hardware is good.
- DONE set power UICR per <https://devzone.nordicsemi.com/f/nordic-q-a/28562/nrf52840-regulator-configuration>
- switch charge controller into / out of performance mode (see 8.3.1 in datasheet)
- write UC1701 wrapper
- Test hardfault handler for null ptrs (if one isn't already installed)
- test my hackedup bootloader on the real hardware
- Use the PMU driver on real hardware
- Use new radio driver on real hardware
- Use UC1701 LCD driver on real hardware. Still need to create at startup and probe on SPI. Make sure SPI is atomic.
- set vbus voltage per <https://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html?cp=4_0_0_4_2>
- test the LEDs
- test the buttons
## Secondary work items
Needed to be fully functional at least at the same level of the ESP32 boards. At this point users would probably want them.
- DONE get serial API working
- get full BLE api working
- make power management/sleep work properly
- make a settimeofday implementation
- DONE increase preamble length? - will break other clients? so all devices must update
- DONE enable BLE DFU somehow
- report appversion/hwversion in BLE
- use new LCD driver from screen.cpp. Still need to hook it to a subclass of (poorly named) OLEDDisplay, and override display() to stream bytes out to the screen.
- we need to enable the external tcxo for the sx1262 (on dio3)?
- figure out which regulator mode the sx1262 is operating in
- turn on security for BLE, make pairing work
- make ble endpoints not require "start config", just have them start in config mode
- use new PMU to provide battery voltage/% full to app (both bluetooth and screen)
- do initial power measurements, measure effects of more preamble bits, measure power management and confirm battery life
- set UICR.CUSTOMER to indicate board model & version
## Items to be 'feature complete'
- check datasheet about sx1262 temperature compensation
- enable brownout detection and watchdog
- stop polling for GPS characters, instead stay blocked on read in a thread
- figure out what the correct current limit should be for the sx1262, currently we just use the default 100
- put sx1262 in sleepmode when processor gets shutdown (or rebooted), ideally even for critical faults (to keep power draw low). repurpose deepsleep state for this.
- good power management tips: <https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/optimizing-power-on-nrf52-designs>
- call PMU set_ADC_CONV(0) during sleep, to stop reading PMU adcs and decrease current draw
- do final power measurements
- backport the common PMU API between AXP192 and PmuBQ25703A
- use the new buttons in the UX
- currently using soft device SD140, is that ideal?
- turn on the watchdog timer, require servicing from key application threads
- nrf52setup should call randomSeed(tbd)
- implement SYSTEMOFF behavior per <https://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html?cp=4_0_0_4_2>
## Things to do 'someday'
Nice ideas worth considering someday...
- enable monitor mode debugging (need to use real jlink): <https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/monitor-mode-debugging-with-j-link-and-gdbeclipse>
- Improve efficiency of PeriodicTimer by only checking the next queued timer event, and carefully sorting based on schedule
- make a Mfg Controller and device under test classes as examples of custom app code for third party devs. Make a post about this. Use a custom payload type code. Have device under test send a broadcast with max hopcount of 0 for the 'mfgcontroller' payload type. mfg controller will read SNR and reply. DOT will declare failure/success and switch to the regular app screen.
- Hook Segger RTT to the nordic logging framework. <https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/debugging-with-real-time-terminal>
- Use nordic logging for DEBUG_MSG
- use the Jumper simulator to run meshes of simulated hardware: <https://docs.jumper.io/docs/install.html>
- make/find a multithread safe debug logging class (include remote logging and timestamps and levels). make each log event atomic.
- turn on freertos stack size checking
- Currently we use Nordic's vendor ID, which is apparently okay: <https://devzone.nordicsemi.com/f/nordic-q-a/44014/using-nordic-vid-and-pid-for-nrf52840> and I just picked a PID of 0x4403
- Use NRF logger module (includes flash logging etc...) instead of DEBUG_MSG
- Use "LED softblink" library on NRF52 to do nice pretty "breathing" LEDs. Don't whack LED from main thread anymore.
- decrease BLE xmit power "At 0dBm with the DC/DC on, the nRF52832 transmitter draws 5.3mA. Increasing the TX power to +4dBm adds only 2.2mA. Decreasing it to -40 dBm saves only 2.6mA."
- in addition to the main CPU watchdog, use the PMU watchdog as a really big emergency hammer
- turn on 'shipping mode' in the PMU when device is 'off' - to cut battery draw to essentially zero
- make Lorro_BQ25703A read/write operations atomic, current version could let other threads sneak in (once we start using threads)
- make the segger logbuffer larger, move it to RAM that is preserved across reboots and support reading it out at runtime (to allow full log messages to be included in crash reports). Share this code with ESP32 (use gcc noinit attribute)
- convert hardfaults/panics/asserts/wd exceptions into fault codes sent to phone
- stop enumerating all i2c devices at boot, it wastes power & time
- consider using "SYSTEMOFF" deep sleep mode, without RAM retension. Only useful for 'truly off - wake only by button press' only saves 1.5uA vs SYSTEMON. (SYSTEMON only costs 1.5uA). Possibly put PMU into shipping mode?
- change the BLE protocol to be more symmetric. Have the phone _also_ host a GATT service which receives writes to
'fromradio'. This would allow removing the 'fromnum' mailbox/notify scheme of the current approach and decrease the number of packet handoffs when a packet is received.
- Using the preceeding, make a generalized 'nrf52/esp32 ble to internet' bridge service. To let nrf52 apps do MQTT/UDP/HTTP POST/HTTP GET operations to web services.
- lower advertise interval to save power, lower ble transmit power to save power
- the SX126x class does SPI transfers on a byte by byte basis, which is very ineffecient. Much better to do block writes/reads.
## Old unorganized notes
## Notes on PCA10059 Dongle
- docs: <https://infocenter.nordicsemi.com/pdf/nRF52840_Dongle_User_Guide_v1.0.pdf>
- Currently using Nordic PCA10059 Dongle hardware
- <https://community.platformio.org/t/same-bootloader-same-softdevice-different-board-different-pins/11411/9>
- To make Segger JLink more reliable, turn off its fake filesystem. "JLinkExe MSDDisable" per <https://learn.adafruit.com/circuitpython-on-the-nrf52/nrf52840-bootloader>
## Done
- DONE add "DFU trigger library" to application load
- DONE: using this: Possibly use this bootloader? <https://github.com/adafruit/Adafruit_nRF52_Bootloader>
- DONE select and install a bootloader (adafruit)
- DONE get old radio driver working on NRF52
- DONE basic test of BLE
- DONE get a debug 'serial' console working via the ICE passthrough feature
- DONE switch to RadioLab? test it with current radio. <https://github.com/jgromes/RadioLib>
- DONE change rx95 to radiolib
- DONE track rxbad, rxgood, txgood
- DONE neg 7 error code from receive
- DONE remove unused sx1262 lib from github
- at boot we are starting our message IDs at 1, rather we should start them at a random number. also, seed random based on timer. this could be the cause of our first message not seen bug.
- add a NMEA based GPS driver to test GPS
- DONE use "variants" to get all gpio bindings
- DONE plug in correct variants for the real board
- turn on DFU assistance in the appload using the nordic DFU helper lib call
- make a new boarddef with a variant.h file. Fix pins in that file. In particular (at least):
#define PIN_SPI_MISO (46)
#define PIN_SPI_MOSI (45)
#define PIN_SPI_SCK (47)
#define PIN_WIRE_SDA (26)
#define PIN_WIRE_SCL (27)
- customize the bootloader to use proper button bindings
- remove the MeshRadio wrapper - we don't need it anymore, just do everything in RadioInterface subclasses.
- DONE use SX126x::startReceiveDutyCycleAuto to save power by sleeping and briefly waking to check for preamble bits. Change xmit rules to have more preamble bits.
- scheduleOSCallback doesn't work yet - it is way too fast (causes rapid polling of busyTx, high power draw etc...)
- find out why we reboot while debugging - it was bluetooth/softdevice
- make a file system implementation (preferably one that can see the files the bootloader also sees) - preferably <https://github.com/adafruit/Adafruit_nRF52_Arduino/blob/master/libraries/InternalFileSytem/examples/Internal_ReadWrite/Internal_ReadWrite.ino> else use <https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/lib_fds_usage.html?cp=7_5_0_3_55_3>
- change packet numbers to be 32 bits
per
<https://docs.platformio.org/en/latest/tutorials/nordicnrf52/arduino_debugging_unit_testing.html>
ardunino github is here <https://github.com/sandeepmistry/arduino-nRF5>
devboard hw docs here:
<https://infocenter.nordicsemi.com/topic/ug_nrf52840_dk/UG/nrf52840_DK/hw_buttons_leds.html?cp=4_0_4_7_6>
<https://docs.platformio.org/en/latest/boards/nordicnrf52/nrf52840_dk_adafruit.html>
must install adafruit bootloader first!
<https://learn.adafruit.com/circuitpython-on-the-nrf52/nrf52840-bootloader>
see link above and turn off jlink filesystem if we see unreliable serial comms
over USBCDC
adafruit bootloader install commands (from their readme)
kevinh@kevin-server:~/.platformio/packages/framework-arduinoadafruitnrf52/bootloader$
nrfjprog -e -f nrf52 Erasing user available code and UICR flash areas. Applying
system reset.
kevinh@kevin-server:~/.platformio/packages/framework-arduinoadafruitnrf52/bootloader$
nrfjprog --program pca10056/pca10056_bootloader-0.3.2_s140_6.1.1.hex -f nrf52
Parsing hex file.
Reading flash area to program to guarantee it is erased.
Checking that the area to write is not protected.
Programming device.
kevinh@kevin-server:~/.platformio/packages/framework-arduinoadafruitnrf52/bootloader$
nrfjprog --reset -f nrf52 Applying system reset. Run.
install jlink tools from here:
<https://www.segger.com/downloads/jlink#J-LinkSoftwareAndDocumentationPack>
install nrf tools from here:
<https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Command-Line-Tools/Download#infotabs>
examples of turning off the loop call to save power:
<https://learn.adafruit.com/bluefruit-nrf52-feather-learning-guide/advertising-beacon>
example of a more complex BLE service:
<https://learn.adafruit.com/bluefruit-nrf52-feather-learning-guide/custom-hrm>
See g_ADigitalPinMap to see how arduino maps to the real gpio#s - and all in P0
```cpp
#define LED1 14
#define LED2 13
```
Good LED BLE demo [Here](https://github.com/adafruit/Adafruit_nRF52_Arduino/blob/master/libraries/Bluefruit52Lib/examples/Peripheral/nrf_blinky/nrf_blinky.ino)

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---
id: pinetab
title: Pinetab
sidebar_label: Pinetab
---
These are **preliminary** notes on support for Meshtastic in the Pinetab.
A RF95 is connected via a CH341 USB-SPI chip.
Pin assignments:
CS0 from RF95 goes to CS0 on CH341
DIO0 from RF95 goes to INT on CH341
RST from RF95 goes to RST on CH341
This linux driver claims to provide USB-SPI support: https://github.com/gschorcht/spi-ch341-usb
Notes here on using that driver: https://www.linuxquestions.org/questions/linux-hardware-18/ch341-usb-to-spi-adaptor-driver-doesn%27t-work-4175622736/
Or if **absolutely** necessary could bitbang: https://www.cnx-software.com/2018/02/16/wch-ch341-usb-to-serial-chip-gets-linux-driver-to-control-gpios-over-usb/
## Portduino tasks
- How to access spi devices via ioctl (spidev): https://www.raspberrypi.org/documentation/hardware/raspberrypi/spi/README.md#:~:text=Troubleshooting-,Overview,bus)%2C%20UARTs%2C%20etc.
- access gpio via libgpiod?
- Use dkms to distribute driver?
- echo 100 > /sys/module/spi_ch341_usb/parameters/poll_period
## Task list
- Port meshtastic to build (under platformio) for a poxix target. spec: no screen, no gpios, sim network interface, posix threads, posix semaphores & queues, IO to the console only
Use ARM linux: https://platformio.org/platforms/linux_arm
And linux native: https://platformio.org/platforms/native
- Test cs341 driver - just test reading/writing a register and detecting interrupts, confirm can see rf95
- Make a radiolib spi module that targets the cs341 (and builds on linux)
- use new radiolib module to hook pinebook lora to meshtastic, confirm mesh discovery works
- Make a subclass of StreamAPI that works as a posix TCP server
- Use new TCP endpoint from meshtastic-python

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---
id: plugin-api
title: Plugin API
sidebar_label: Plugin API
---
This is a tutorial on how to write small plugins which run on the device. Plugins are bits regular 'arduino' code that can send and receive packets to other nodes/apps/PCs using our mesh.
## Key concepts
All plugins should be subclasses of MeshPlugin. By inheriting from this class and creating an instance of your new plugin your plugin will be automatically registered to receive packets.
Messages are sent to particular port numbers (similar to UDP networking). Your new plugin should eventually pick its own port number (see below), but at first you can simply use PRIVATE_APP (which is the default).
Packets can be sent/received either as raw binary structures or as [Protobufs](https://developers.google.com/protocol-buffers).
### Class heirarchy
The relevant bits of the class heirarchy are as follows
- [MeshPlugin](http://github.com/meshtastic/meshtastic-device/tree/master/src/mesh/MeshPlugin.h) (in src/mesh/MeshPlugin.h) - you probably don't want to use this baseclass directly
- [SinglePortPlugin](http://github.com/meshtastic/meshtastic-device/tree/master/src/mesh/SinglePortPlugin.h) (in src/mesh/SinglePortPlugin.h) - for plugins that send/receive from a single port number (the normal case)
- [ProtobufPlugin](http://github.com/meshtastic/meshtastic-device/tree/master/src/mesh/ProtobufPlugin.h) (in src/mesh/ProtobufPlugin.h) - for plugins that send/receive a single particular Protobuf type. Inherit from this if you are using protocol buffers in your plugin.
You will typically want to inherit from either SinglePortPlugin (if you are just sending/receiving raw bytes) or ProtobufPlugin (if you are sending/receiving protobufs). You'll implement your own handleReceived/handleReceivedProtobuf - probably based on the example code.
If your plugin needs to perform any operations at startup you can override and implement the setup() method to run your code.
If you need to send a packet you can call service.sendToMesh with code like this (from the examples):
```cpp
MeshPacket *p = allocReply();
p->to = dest;
service.sendToMesh(p);
```
## Example plugins
A number of [key services](http://github.com/meshtastic/meshtastic-device/tree/master/src/plugins) are implemented using the plugin API, these plugins are as follows:
- [TextMessagePlugin](http://github.com/meshtastic/meshtastic-device/tree/master/src/plugins/TextMessagePlugin.h) - receives text messages and displays them on the LCD screen/stores them in the local DB
- [NodeInfoPlugin](http://github.com/meshtastic/meshtastic-device/tree/master/src/plugins/NodeInfoPlugin.h) - receives/sends User information to other nodes so that usernames are available in the databases
- [RemoteHardwarePlugin](http://github.com/meshtastic/meshtastic-device/tree/master/src/plugins/RemoteHardwarePlugin.h) - a plugin that provides easy remote access to device hardware (for things like turning GPIOs on or off). Intended to be a more extensive example and provide a useful feature of its own. See [remote-hardware](remote-hardware-service.md) for details.
- [ReplyPlugin](http://github.com/meshtastic/meshtastic-device/tree/master/src/plugins/ReplyPlugin.h) - a simple plugin that just replies to any packet it receives (provides a 'ping' service).
## Getting started
The easiest way to get started is:
- [Build and install](build-instructions.md) the standard codebase from github.
- Copy [src/plugins/ReplyPlugin.\*](http://github.com/meshtastic/meshtastic-device/tree/master/src/plugins/ReplyPlugin.cpp) into src/plugins/YourPlugin.*. Then change the port number from *PortNum_REPLY_APP* to *PortNum_PRIVATE_APP\*.
- Edit plugins/Plugins.cpp:setupPlugins() to add a call to create an instance of your plugin (see comment at head of that function)
- Rebuild with your new messaging goodness and install on the device
- Use the [meshtastic commandline tool](https://github.com/meshtastic/Meshtastic-python) to send a packet to your board, for example "_meshtastic --dest 1234 --sendping_", where _1234_ is another mesh node to send the ping to.
## Threading
It is very common that you would like your plugin to be invoked periodically.
We use a crude/basic cooperative threading system to allow this on any of our supported platforms. Simply inherit from OSThread and implement runOnce(). See the OSThread [documentation](http://github.com/meshtastic/meshtastic-device/tree/master/src/concurrency/OSThread.h) for more details. For an example consumer of this API see RemoteHardwarePlugin::runOnce.
## Sending messages
If you would like to proactively send messages (rather than just responding to them), just call service.sendToMesh(). For an example of this see [NodeInfoPlugin::sendOurNodeInfo(...)](http://github.com/meshtastic/meshtastic-device/tree/master/src/plugins/NodeInfoPlugin.cpp).
## Picking a port number
For any new 'apps' that run on the device or via sister apps on phones/PCs they should pick and use a unique 'portnum' for their application.
If you are making a new app using meshtastic, please send in a pull request to add your 'portnum' to [the master list](https://github.com/meshtastic/Meshtastic-protobufs/blob/master/portnums.proto). PortNums should be assigned in the following range:
- **0-63** Core Meshtastic use; do not use for third party apps
- **64-127** Registered 3rd party apps. Send in a pull request that adds a new entry to portnums.proto to register your application
- **256-511** Use one of these portnums for your private applications that you don't want to register publically
- **1024-66559** Are reserved for use by IP tunneling (see _FIXME_ for more information)
All other values are reserved.
## How to add custom protocol buffers
If you would like to use protocol buffers to define the structures you send over the mesh (recommended), here's how to do that.
- Create a new .proto file in the protos directory. You can use the existing [remote_hardware.proto](https://github.com/meshtastic/Meshtastic-protobufs/blob/master/remote_hardware.proto) file as an example.
- Run "bin/regen-protos.sh" to regenerate the C code for accessing the protocol buffers. If you don't have the required nanopb tool, follow the instructions printed by the script to get it.
- Done! You can now use your new protobuf just like any of the existing protobufs in meshtastic.

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---
id: power
title: Power Management State Machine
sidebar_label: Power Management
---
i.e. sleep behavior
## Power measurements
Since one of the main goals of this project is long battery life, it is important to consider that in our software/protocol design. Based on initial measurements it seems that the current code should run about three days between charging, and with a bit more software work. A battery life of eight days should be quite doable. Our current power measurements/model is in [this spreadsheet](https://docs.google.com/spreadsheets/d/1ft1bS3iXqFKU8SApU8ZLTq9r7QQEGESYnVgdtvdT67k/edit?usp=sharing).
## States
From lower to higher power consumption.
- Super-deep-sleep (SDS) - everything is off, CPU, radio, bluetooth, GPS. Only wakes due to timer or button press. We enter this mode only after no radio comms for a few hours, used to put the device into what is effectively "off" mode.
onEntry: setBluetoothOn(false), call doDeepSleep
onExit: (standard bootup code, starts in DARK)
- deep-sleep (DS) - CPU is off, radio is on, bluetooth and GPS is off. Note: This mode is never used currently, because it only saves 1.5mA vs light-sleep
(Not currently used)
- light-sleep (LS) - CPU is suspended (RAM stays alive), radio is on, bluetooth is off, GPS is off. Note: currently GPS is not turned
off during light sleep, but there is a TODO item to fix this.
NOTE: On NRF52 platforms (because CPU current draw is so low), light-sleep state is never used.
onEntry: setBluetoothOn(false), setGPSPower(false), doLightSleep()
onIdle: (if we wake because our led blink timer has expired) blink the led then go back to sleep until we sleep for ls_secs
onExit: setGPSPower(true), start trying to get gps lock: gps.startLock(), once lock arrives service.sendPosition(BROADCAST)
- No bluetooth (NB) - CPU is running, radio is on, GPS is on but bluetooth is off, screen is off.
onEntry: setBluetoothOn(false)
onExit:
- running dark (DARK) - Everything is on except screen
onEntry: setBluetoothOn(true)
onExit:
- serial API usage (SERIAL) - Screen is on, device doesn't sleep, bluetooth off
onEntry: setBluetooth off, screen on
onExit:
- full on (ON) - Everything is on, can eventually timeout and lower to a lower power state
onEntry: setBluetoothOn(true), screen.setOn(true)
onExit: screen->setOn(false)
- has power (POWER) - Screen is on, device doesn't sleep, bluetooth on, will stay in this state as long as we have power
onEntry: setBluetooth off, screen on
onExit:
## Behavior
### events that increase CPU activity
- At cold boot: The initial state (after setup() has run) is DARK
- While in DARK: if we receive EVENT_BOOT, transition to ON (and show the bootscreen). This event will be sent if we detect we woke due to reset (as opposed to deep sleep)
- While in LS: Once every position_broadcast_secs (default 15 mins) - the unit will wake into DARK mode and broadcast a "networkPing" (our position) and stay alive for wait_bluetooth_secs (default 60 seconds). This allows other nodes to have a record of our last known position if we go away and allows a paired phone to hear from us and download messages.
- While in LS: Every send*owner_interval (defaults to 4, i.e. one hour), when we wake to send our position we \_also* broadcast our owner. This lets new nodes on the network find out about us or correct duplicate node number assignments.
- While in LS/NB/DARK: If the user presses a button (EVENT_PRESS) we go to full ON mode for screen_on_secs (default 30 seconds). Multiple presses keeps resetting this timeout
- While in LS/NB/DARK: If we receive new text messages (EVENT_RECEIVED_TEXT_MSG), we go to full ON mode for screen_on_secs (same as if user pressed a button)
- While in LS: while we receive packets on the radio (EVENT_RECEIVED_PACKET) we will wake and handle them and stay awake in NB mode for min_wake_secs (default 10 seconds)
- While in NB: If we do have packets the phone (EVENT_PACKETS_FOR_PHONE) would want we transition to DARK mode for wait_bluetooth secs.
- While in DARK/ON: If we receive EVENT_BLUETOOTH_PAIR we transition to ON and start our screen_on_secs timeout
- While in NB/DARK/ON: If we receive EVENT_NODEDB_UPDATED we transition to ON (so the new screen can be shown)
- While in DARK: While the phone talks to us over BLE (EVENT_CONTACT_FROM_PHONE) reset any sleep timers and stay in DARK (needed for bluetooth sw update and nice user experience if the user is reading/replying to texts)
- while in LS/NB/DARK: if SERIAL_CONNECTED, go to serial
- while in any state: if we have AC power, go to POWER
### events that decrease cpu activity
- While in POWER: if lose AC go to ON
- While in SERIAL: if SERIAL_DISCONNECTED, go to NB
- While in ON: If PRESS event occurs, reset screen_on_secs timer and tell the screen to handle the pess
- While in ON: If it has been more than screen_on_secs since a press, lower to DARK
- While in DARK: If time since last contact by our phone exceeds phone_timeout_secs (15 minutes), we transition down into NB mode
- While in DARK or NB: If nothing above is forcing us to stay in a higher mode (wait_bluetooth_secs, min_wake_secs) we will lower down to LS state
- While in LS: If either phone_sds_timeout_secs (default 2 hr) or mesh_sds_timeout_secs (default 2 hr) are exceeded we will lower into SDS mode for sds_secs (default 1 yr) (or a button press). (Note: phone_sds_timeout_secs is currently disabled for now, because most users
are using without a phone)
- Any time we enter LS mode: We stay in that until an interrupt, button press or other state transition. Every ls_secs (default 1 hr) and let the arduino loop() run one iteration (FIXME, not sure if we need this at all), and then immediately reenter lightsleep mode on the CPU.
TODO: Eventually these scheduled intervals should be synchronized to the GPS clock, so that we can consider leaving the lora receiver off to save even more power.
TODO: In NB mode we should put cpu into light sleep any time we really aren't that busy (without declaring LS state) - i.e. we should leave GPS on etc...
# Low power consumption tasks
General ideas to hit the power draws our spreadsheet predicts. Do the easy ones before beta, the last 15% can be done after 1.0.
- don't even power on the gps until someone else wants our position, just stay in lora deep sleep until press or rxpacket (except for once an hour updates)
- (possibly bad idea - better to have lora radio always listen - check spreadsheet) have every node wake at the same tick and do their position syncs then go back to deep sleep
- lower BT announce interval to save battery
- change to use RXcontinuous mode and config to drop packets with bad CRC (see section 6.4 of datasheet) - I think this is already the case
- have mesh service run in a thread that stays blocked until a packet arrives from the RF95
- platformio sdkconfig CONFIG_PM and turn on modem sleep mode
- keep cpu 100% in deepsleep until irq from radio wakes it. Then stay awake for 30 secs to attempt delivery to phone.
- use https://lastminuteengineers.com/esp32-sleep-modes-power-consumption/ association sleep pattern to save power - but see https://github.com/espressif/esp-idf/issues/2070 and https://esp32.com/viewtopic.php?f=13&t=12182 it seems with BLE on the 'easy' draw people are getting is 80mA
- stop using loop() instead use a job queue and let cpu sleep
- measure power consumption and calculate battery life assuming no deep sleep
- do lowest sleep level possible where BT still works during normal sleeping, make sure cpu stays in that mode unless lora rx packet happens, bt rx packet happens or button press happens
- optionally do lora messaging only during special scheduled intervals (unless nodes are told to go to low latency mode), then deep sleep except during those intervals - before implementing calculate what battery life would be with this feature
- see section 7.3 of https://cdn.sparkfun.com/assets/learn_tutorials/8/0/4/RFM95_96_97_98W.pdf and have hope radio wake only when a valid packet is received. Possibly even wake the ESP32 from deep sleep via GPIO.
- never enter deep sleep while connected to USB power (but still go to other low power modes)
- when main cpu is idle (in loop), turn cpu clock rate down and/or activate special sleep modes. We want almost everything shutdown until it gets an interrupt.

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---
id: rak815
title: RAK815
sidebar_label: RAK815
---
Notes on trying to get the RAK815 working with meshtastic.
good tutorial: https://www.hackster.io/naresh-krish/getting-started-with-rak815-tracker-module-and-arduino-1c7bc9
(includes software serial link - possibly useful for GPS)

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---
id: remote-hardware-service
title: Remote Hardware Service
sidebar_label: Remote Hardware
---
FIXME - the following are a collection of notes moved from elsewhere. We need to refactor these notes into actual documentation on the remote-hardware/gpio service.
### 1.7.2. New 'no-code-IOT' mini-app
Add a new 'remote GPIO/serial port/SPI/I2C access' mini-app. This new standard app would use the MQTT messaging layer to let users (developers that don't need to write device code) do basic (potentially dangerous) operations remotely.
#### 1.7.2.1. Supported operations in the initial release
Initially supported features for no-code-IOT.
- Set any GPIO
- Read any GPIO
#### 1.7.2.2. Supported operations eventually
General ideas for no-code IOT.
- Subscribe for notification of GPIO input status change (i.e. when pin goes low, send my app a message)
- Write/read N bytes over I2C/SPI bus Y (as one atomic I2C/SPI transaction)
- Send N bytes out serial port Z
- Subscribe for notification for when regex X matches the bytes that were received on serial port Z

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---
id: sw-design
title: Software Design
sidebar_label: Software Design
---
This is a mini design doc for developing the meshtastic software.
- [Build instructions](build-instructions.md)
- [On device plugin API](plugin-api.md) - a tutorial on how to write small Plugins which run on the device and can message other nodes.
- Our [project board](https://github.com/orgs/meshtastic/projects/1) - shows what things we are currently working on and remaining work items for the current release.
- [Power Management](power.md)
- [Mesh algorithm](mesh-alg.md)
- [External client API](device-api.md) and porting guide for new clients (iOS, python, etc...)
- TODO: how to port the device code to a new device.

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module.exports = {
title: "Meshtastic",
tagline: "Open Source hiking, pilot, skiing and secure GPS mesh communicator",
url: "https://meshtastic.org",
baseUrl: "/",
onBrokenLinks: "throw",
onBrokenMarkdownLinks: "warn",
favicon: "img/meshtastic-design/web/favicon.ico",
organizationName: "meshtastic",
projectName: "meshtastic",
themeConfig: {
colorMode: {
respectPrefersColorScheme: true,
},
navbar: {
title: "Meshtastic",
logo: {
alt: "Meshtastic Logo",
src: "img/meshtastic-design/logo/svg/Mesh_Logo_Black.svg",
srcDark: "img/meshtastic-design/logo/svg/Mesh_Logo_White.svg",
},
items: [
{
to: "docs/",
activeBasePath: "docs",
label: "Docs",
position: "left",
},
{
href: "https://meshtastic.discourse.group",
label: "Forum",
position: "left",
},
{
href: "https://github.com/meshtastic/meshtastic",
position: "right",
className: "header-github-link",
"aria-label": "GitHub repository",
},
],
},
footer: {
style: "dark",
links: [
{
title: "Docs",
items: [
{
label: "Device",
to: "docs/device/radio-settings/",
},
{
label: "Software",
to: "docs/software/sw-design/",
},
{
label: "meshtastic.js",
to: "docs/js/getting-started/",
},
{
label: "Protobufs",
to: "docs/protobufs/api",
},
],
},
{
title: "Community",
items: [
{
label: "Stack Overflow",
href: "https://stackoverflow.com/questions/tagged/docusaurus",
},
{
label: "Discord",
href: "https://discordapp.com/invite/docusaurus",
},
{
label: "Twitter",
href: "https://twitter.com/docusaurus",
},
],
},
{
title: "More",
items: [
{
label: "GitHub",
href: "https://github.com/meshtastic/meshtastic",
},
],
},
],
copyright: `Meshtastic® trademark is a registered trademark belonging to Geeksville Industries LLC`,
},
},
presets: [
[
"@docusaurus/preset-classic",
{
docs: {
sidebarPath: require.resolve("./sidebars.js"),
// Please change this to your repo.
editUrl:
"https://github.com/meshtastic/meshtastic/edit/master/website/",
},
theme: {
customCss: require.resolve("./src/css/custom.css"),
},
},
],
],
};

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{
"name": "meshtastic",
"version": "0.0.0",
"private": true,
"scripts": {
"docusaurus": "docusaurus",
"start": "docusaurus start",
"build": "docusaurus build",
"swizzle": "docusaurus swizzle",
"deploy": "docusaurus deploy",
"serve": "docusaurus serve",
"clear": "docusaurus clear"
},
"dependencies": {
"@docusaurus/core": "^2.0.0-alpha.72",
"@docusaurus/preset-classic": "^2.0.0-alpha.72",
"@mdx-js/react": "^1.6.21",
"clsx": "^1.1.1",
"docusaurus": "^2.0.0-alpha.378053ac5",
"react": "^16.8.4",
"react-dom": "^16.8.4"
},
"browserslist": {
"production": [
">0.5%",
"not dead",
"not op_mini all"
],
"development": [
"last 1 chrome version",
"last 1 firefox version",
"last 1 safari version"
]
},
"devDependencies": {
"@docusaurus/module-type-aliases": "^2.0.0-alpha.72",
"@tsconfig/docusaurus": "^1.0.2",
"@types/react": "^17.0.2",
"@types/react-helmet": "^6.1.0",
"@types/react-router-dom": "^5.1.7",
"typescript": "^4.2.2"
}
}

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---
id: api
title: Protobuf API Reference
sidebar_label: API
---
{{range .Files}}
## {{.Name}}
{{if .Messages}}
{{range .Messages}}
### {{.LongName}}
{{if .Description}}
:::note `message` description
{{.Description}}
:::
{{end}}
{{if .HasFields}}
| Field | Type | Description |
| ----- | ---- | ----------- |
{{range .Fields -}}
| {{if .IsOneof}}[**oneof**](https://developers.google.com/protocol-buffers/docs/proto3#oneof) {{.OneofDecl}}.{{end}}{{.Name}} | {{if eq (index .LongType 0) (index (.LongType | upper) 0 )}}[`{{.LongType}}`](#{{.LongType | lower | replace "." ""}}){{else}}{{.LongType}}{{end}} | {{if .Description}}{{nobr .Description}}{{if .DefaultValue}} Default: {{.DefaultValue}}{{end}}{{else}}none{{end}} |
{{end}}
{{end}}
{{end}}
{{end}}
{{if .Enums}}
{{range .Enums}}
### {{.LongName}}
{{if .Description}}
:::note `enum` description
{{.Description}}
:::
{{end}}
| Name | Number | Description |
| ---- | ------ | ----------- |
{{range .Values -}}
| `{{.Name}}` | `{{.Number}}` | {{if .Description}}{{nobr .Description}}{{else}}none{{end}} |
{{end}}
{{end}}
{{end}}
{{end}}

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module.exports = {
Sidebar: {
"Getting Started": ["overview"],
Device: [
"device/radio-settings",
"device/supported-hardware",
"device/faq",
"device/http-api",
"device/documents",
],
Software: [
"software/sw-design",
"software/remote-hardware-service",
"software/rak815",
"software/power",
"software/plugin-api",
"software/pinetab",
"software/nrf52-TODO",
"software/mqtt",
"software/mesh-alg",
"software/install-OSX",
"software/esp32-arduino-build-notes",
"software/device-api",
"software/crypto",
"software/build-instructions",
"software/ant",
],
"Meshtastic.js": [
"js/getting-started",
"js/connecting",
"js/events",
"js/http-api",
],
Protobufs: ["protobufs/api"],
},
};

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/* stylelint-disable docusaurus/copyright-header */
/**
* Any CSS included here will be global. The classic template
* bundles Infima by default. Infima is a CSS framework designed to
* work well for content-centric websites.
*/
/* You can override the default Infima variables here. */
:root {
--ifm-color-primary: #67ea94;
--ifm-color-primary-dark: rgb(33, 175, 144);
--ifm-color-primary-darker: rgb(31, 165, 136);
--ifm-color-primary-darkest: rgb(26, 136, 112);
--ifm-color-primary-light: rgb(70, 203, 174);
--ifm-color-primary-lighter: rgb(102, 212, 189);
--ifm-color-primary-lightest: rgb(146, 224, 208);
--ifm-code-font-size: 95%;
}
.docusaurus-highlight-code-line {
background-color: rgb(72, 77, 91);
display: block;
margin: 0 calc(-1 * var(--ifm-pre-padding));
padding: 0 var(--ifm-pre-padding);
}
.header-github-link:hover {
opacity: 0.6;
}
.header-github-link:before {
content: "";
width: 24px;
height: 24px;
display: flex;
background: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12'/%3E%3C/svg%3E")
no-repeat;
}
html[data-theme="dark"] .header-github-link:before {
background: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill='white' d='M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12'/%3E%3C/svg%3E")
no-repeat;
}

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import React from 'react';
import clsx from 'clsx';
import useBaseUrl from '@docusaurus/useBaseUrl';
import useDocusaurusContext from '@docusaurus/useDocusaurusContext';
import Layout from '@theme/Layout';
import styles from './styles.module.css';
const features = [
{
title: "Easy to Use",
imageUrl: "img/undraw_docusaurus_mountain.svg",
description: (
<>
Docusaurus was designed from the ground up to be easily installed and
used to get your website up and running quickly.
</>
),
},
{
title: "Focus on What Matters",
imageUrl: "img/undraw_docusaurus_tree.svg",
description: (
<>
Docusaurus lets you focus on your docs, and we&apos;ll do the chores. Go
ahead and move your docs into the <code>docs</code> directory.
</>
),
},
{
title: "Powered by React",
imageUrl: "img/undraw_docusaurus_react.svg",
description: (
<>
Extend or customize your website layout by reusing React. Docusaurus can
be extended while reusing the same header and footer.
</>
),
},
];
function Feature({ imageUrl, title, description }) {
const imgUrl = useBaseUrl(imageUrl);
return (
<div className={clsx("col col--4", styles.feature)}>
{imgUrl && (
<div className="text--center">
<img className={styles.featureImage} src={imgUrl} alt={title} />
</div>
)}
<h3>{title}</h3>
<p>{description}</p>
</div>
);
}
function Home() {
const context = useDocusaurusContext();
const { siteConfig = {} } = context;
return (
<Layout
title=""
description="Description will go into a meta tag in <head />"
>
<header className={clsx("hero hero--primary", styles.heroBanner)}>
<div className="container">
<h1 className="hero__title">
<img
style={{ paddingTop: "2rem", paddingBottom: "2rem" }}
alt="Meshtastic Logo"
className="header__logo"
src={useBaseUrl("img/meshtastic-design/typelogo/typelogo.svg")}
/>
</h1>
<p className="hero__subtitle">{siteConfig.tagline}</p>
</div>
</header>
<main>
{features && features.length > 0 && (
<section className={styles.features}>
<div className="container">
<div className="row">
{features.map((props, idx) => (
<Feature key={idx} {...props} />
))}
</div>
</div>
</section>
)}
</main>
</Layout>
);
}
export default Home;

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/* stylelint-disable docusaurus/copyright-header */
/**
* CSS files with the .module.css suffix will be treated as CSS modules
* and scoped locally.
*/
.heroBanner {
padding: 4rem 0;
text-align: center;
position: relative;
overflow: hidden;
}
@media screen and (max-width: 966px) {
.heroBanner {
padding: 2rem;
}
}
.buttons {
display: flex;
align-items: center;
justify-content: center;
}
.features {
display: flex;
align-items: center;
padding: 2rem 0;
width: 100%;
}
.featureImage {
height: 200px;
width: 200px;
}

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Subproject commit d0339f0297c629f1bd6873b4abccfecb98443538

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