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meshtastic/website/docs/software/plugins/serial.md
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id title sidebar_label
serial-plugin Serial communication plugin Serial communication

About

This is a simple interface to send messages over the mesh network by sending strings over a serial port.

Default is to use RX GPIO 16 and TX GPIO 17.

Basic Usage:

  1. Enable the plugin by setting serialplugin_enabled to 1.
  2. Set the pins (serialplugin_rxd / serialplugin_rxd) for your preferred RX and TX GPIO pins. On tbeam boards it is recommend to use:
    • RXD 35
    • TXD 15
  3. Set serialplugin_timeout to the amount of time to wait before we consider your packet as "done".
  4. (Optional) In SerialPlugin.h set the port to PortNum_TEXT_MESSAGE_APPif you want to send messages to/from the general text message channel.
  5. Connect to your device over the serial interface at 38400 8N1.
  6. Send a packet up to 240 bytes in length. This will get relayed over the mesh network.
  7. (Optional) Set serialplugin_echo to 1 and any message you send out will be echoed back to your device.

TODO (in this order):

  • Define a verbose RX mode to report on mesh and packet infomration. :::note This won't happen any time soon. :::

Known Problems

* Until the plugin is initilized by the startup sequence, the TX pin is in a floating state. Device connected to that pin may see this as "noise".
* Will not work on NRF and the Linux device targets.

Need help?

Need help with this plugin? Post your question on the Meshtastic Discourse:

https://meshtastic.discourse.group