MeshTastic - unOrganized Source Material:

[last updated: 2025-12-05]
Disclaimers
MeshTastic home page
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Unorganized dumps, mostly from googleAI:

• disable message rebroadcast:
  To prevent a Meshtastic telemetry node from rebroadcasting messages, the "Rebroadcast Mode" setting needs to be configured. The appropriate setting for this purpose is NONE.
  This mode specifically inhibits all rebroadcasts. It is important to note that the NONE rebroadcast mode is only permitted for devices assigned the SENSOR, TRACKER, or TAK_TRACKER roles.
  To apply this setting, connect to the Meshtastic device using the Meshtastic Python API or the Meshtastic Android/iOS application and modify the device's configuration.
  Using the Meshtastic command-line interface (CLI), the command would resemble the following:
  Code
  meshtastic --set device.rebroadcast_mode NONE
  ---------------------------------------------------------

• program node to send message with sensor data:

  Programming a Meshtastic telemetry node to send sensor data involves configuring the Meshtastic device to read and transmit data from connected sensors. There are two primary methods for achieving this:
  1. Using Built-in Telemetry Features for Supported Sensors:

  Meshtastic firmware often includes built-in support for common environment sensors (e.g., BME280 for pressure, humidity, and temperature).

  Wiring the Sensor:
  Connect the supported sensor to the appropriate pins on your Meshtastic node (e.g., I2C pins for BME280). Ensure proper wiring and power connections.
  Enabling Telemetry in the Meshtastic App:

  Connect to your Meshtastic node using the Meshtastic Android, iOS, or Web UI application.
  Navigate to Settings > Telemetry (or Settings > Module Configuration > Telemetry (Sensors) on iOS/iPadOS/macOS).
  Enable the desired sensor type (e.g., "Environment metrics").
  Configure the update interval if needed.
  Save the settings. The node will likely reboot and begin reporting data from the detected sensor.

  ------------------------------

  2. Sending Custom Sensor Data via an External Microcontroller:

  For sensors not directly supported by Meshtastic's built-in telemetry or for more complex data processing, an external microcontroller can be used.

  Connect the External Microcontroller:
  Connect a second microcontroller (e.g., an ESP32, Arduino, or Raspberry Pi Pico) to your Meshtastic node via a serial interface (UART).
  Program the External Microcontroller:

  Write code on the external microcontroller to read data from your specific sensor.
  Format the sensor data into a string.
  Send the formatted string data to the Meshtastic node via the serial connection. You can control the data transmission frequency by adjusting delays in your code.
  Example (using MicroPython on a Pico to send data to a Meshtastic device):
  Python:
  import machine
  import time

  # Configure UART for communication with Meshtastic device
  uart = machine.UART(0, baudrate=9600, tx=machine.Pin(0), rx=machine.Pin(1))

  while True:

  # Read sensor data (replace with your sensor reading code)
  sensor_value = "MySensor: 25.5C"

  # Send data to Meshtastic device
  uart.write(sensor_value + "\n")

  time.sleep(600) # Send data every 10 minutes

  ------------------------------

  
  Configure the Meshtastic Node:
  Enable the serial module on your Meshtastic node and configure it for the correct transmit/receive pins and baud rate.
  Set the serial module mode to "text message" so it repeats any received UART messages over the mesh.
  ------------------------------

  Important Considerations:

  Antenna:
  Always ensure the LoRa antenna is connected before powering on your Meshtastic device to prevent damage to the transceiver.
  Power:
  Provide adequate power to both your Meshtastic node and any external microcontrollers and sensors.
  Data Format:
  When sending custom data, consider a consistent format for easy parsing on the receiving end.
  Frequency:
  Adjust the data transmission frequency based on your needs and battery life considerations.
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