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46 lines
1.6 KiB
Plaintext
46 lines
1.6 KiB
Plaintext
---
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id: serial-module
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title: Serial communication module
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sidebar_label: Serial communication
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sidebar_position: 4
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---
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import PluginModule from '@site/docs/_blocks/_plugin_module.mdx';
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## About
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This is a simple interface to send messages over the mesh network by sending strings over a serial port.
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Default is to use RX GPIO 16 and TX GPIO 17.
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<PluginModule name="serial_plugin" rename="serial_module" />
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## Basic Usage:
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1. Enable the module by setting `serial_module_enabled` to `1`.
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2. Set the pins (`serial_module_rxd` / `serial_module_rxd`) for your preferred RX and TX GPIO pins. On tbeam boards it is recommended to use:
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- RXD 35
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- TXD 15
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3. Set `serial_module_timeout` to the amount of time to wait before we consider your packet as "done".
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4. (Optional) In serial_module.h set the port to `PortNum_TEXT_MESSAGE_APP`if you want to send messages to/from the general text message channel.
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5. Connect to your device over the serial interface at `38400 8N1`.
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6. Send a packet up to 240 bytes in length. This will get relayed over the mesh network.
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7. (Optional) Set `serial_module_echo` to `1` and any message you send out will be echoed back to your device.
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:::note
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The device must be restarted after the settings have been changed for the module to take effect.
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:::
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## TODO (in this order):
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- Define a verbose RX mode to report on mesh and packet information.
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:::note
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This won't happen any time soon.
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:::
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## Known Problems
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- Until the module is initialized by the startup sequence, the TX pin is in a floating state. Device connected to that pin may see this as "noise".
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- Will not work on NRF and the Linux device targets.
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