ttgo-lorawan-probe's Introduction

ttgo-lorawan-probe

LoRaWAN Probe This is a simple LoRaWAN probe that sends multiple messages at different datarates to test the range of a LoRaWAN network. It uses the GPS to get a location and sends this in the message. Supports TTGO T-Beam with Pycom Firmware and OLED display.

Instructions

Create your app at TTN, use the following sample as payload formatter:

function decodeUplink(input) {
  var bytes = input.bytes;
  var port = input.fPort;
  var decoded = {};
  if(port == 1) {
    if(bytes.length == 10) {
      decoded.gpsfix = true;
      decoded.latitude = ((bytes[0]<<16)>>>0) + ((bytes[1]<<8)>>>0) + bytes[2];
      decoded.latitude = (decoded.latitude / 16777215.0 * 180) - 90;
      decoded.longitude = ((bytes[3]<<16)>>>0) + ((bytes[4]<<8)>>>0) + bytes[5];
      decoded.longitude = (decoded.longitude / 16777215.0 * 360) - 180;
      var altValue = ((bytes[6]<<8)>>>0) + bytes[7];
      var sign = bytes[6] & (1 << 7);
      if(sign){
        decoded.altitude = 0xFFFF0000 | altValue;
      }else{
        decoded.altitude = altValue;
      }
      decoded.hdop = bytes[8] / 10.0;
      decoded.sats = bytes[9];
    } 
  }
  if (decoded.latitude == -90) {
    decoded = {};
    decoded.gpsfix = false;
  }

  return {
      data: decoded
    };
}

Create a device in your app
Configure the device to use OTAA or ABP, ABP is better for testing range
Configure an integration to store your received data together with network metrics (rssi and snr)
Configure settings in lib/config.py, including your newly created device at TTN
Push everything to the TTGO
Wait for the messages to arrive at TTN
Check the data in your integration and push it to TTN Mapper
Use the data to create a map of the range of your network
Profit!

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