LoRaWAN-M5Stack

LoRaWAN library for M5Stack LoRaWAN Module, based on the Seeeduino LoRaWAN library. This version works with The Things Network (TTN).

Just replace the original files LoraWan.h and LoRaWan.cpp delivered by the M5Stack Library under M5Stack/src with the ones in the src directory.

The lora.receivePacket function now also informs about the SNR.

result = lora.transferPacketWithConfirmed(coords, sizeof(coords), 5);

if (result == true) {
  Seriel.println("ACK OK");

  short length;
  short rssi;
  float snr;
  char charsnr[5];
  short gwcnt;

  memset(buffer, 0, 256);
  length = lora.receivePacket(buffer, 256, &rssi, &snr, &gwcnt);

  dtostrf(snr, 5, 1, charsnr);

  Seriel.println(rssi);
  Seriel.println(charsnr);

} else {
  Seriel.println("Error");
}

The lora.transferPacketLinkCheckReq function uses the LinkCheckReq MAC command to inform about the number of LoRaWAN gateways which received the request.

result = lora.transferPacketLinkCheckReq(5);

if (result == true) {
  Seriel.println("LCR OK");

  short length;
  short rssi;
  float snr;
  char charsnr[5];
  short gwcnt;

  memset(buffer, 0, 256);
  length = lora.receivePacket(buffer, 256, &rssi, &snr, &gwcnt);

  dtostrf(snr, 5, 1, charsnr);

  Seriel.println(rssi);
  Seriel.println(charsnr);
  Seriel.println(gwcnt);

} else {
  Seriel.println("Error");
}

A bug in the for loop within the lora.transferPacket functions which made the loop run endlessly was fixed. Buffer overflow in sprintf() was fixed.

Used UART has to be configured in LoRaWan.cpp

Things to be aware of

• Firmware 2.1.19 is mandatory for OTAA to work. The RHF76-052 with Firmware 2.1.19 performs the first JOIN with SF12, which will fail, an then switches to SF7.

• setting the datarate with lora.setDataRate(DR5, EU868); will enable ADR and disable the DutyCycle check with firmware 2.1.19