Arduino library to communicate with the lorawan module Murata ST B-L072Z-LRWAN1 or the Miromico FMLR-72-U-STL0Z.

Wiring

• you need to connect power with the power on top or it won't work
• connect it then as follows to your Arduino Nano 33 BLE:

Type	Murata	Nano	Type
	GND	GND
COMMAND	PB8	D3	RTS
BUSY	PA8	D2	CTS
USART1_RX	PA10	TX	UART TX
USART1_TX	PA9	RX	UART RX

Type	Miromico	Nano	Type
	GND	GND
COMMAND	PA8	D3	RTS
BUSY	PB1	D2	CTS
UART2_RX	PA3	TX	UART TX
UART2_TX	PA2	RX	UART RX

Or you can define your own pins for RTS, CTS and define them as follows:

LoRaWANModem modem(uint8_t pin_cts, uint8_t pin_rts);

Usage

Register your device on the network

/*
 * Retrieve device information and use Dev EUI to register it on the network
 */

#include "loramodem.h"

LoRaWANModem modem;

void setup() {
  Serial.begin(9600);
  while (!Serial);

  modem.begin();
  modem.info();
}

void loop() {
}

Join the network using OTAA

/*
 * 1. use app EUI and app key from TTN and set it in the module
 * 2. join the network using OTAA
 */

#include "loramodem.h"

LoRaWANModem modem;

const uint8_t appeui[8]  = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
const uint8_t appkey[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

void setup() {
  Serial.begin(9600);
  while (!Serial);

  modem.begin();
  modem.info();
  modem.join(appeui, appkey);
}

Send packets

/*
 * 1. once the device has joined the network
 * 2. send uplink messages using send()
 */

#include "loramodem.h"

LoRaWANModem modem;

const uint8_t appeui[8]  = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
const uint8_t appkey[16] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

Status join_state;

void setup() {
  Serial.begin(9600);
  while (!Serial);

  modem.begin();
  modem.info();
  join_status = modem.join(appeui, appkey);
}


void loop() {
  delay(10000);
  Serial.println("sending");
  uint8_t payload[11] = { 0x6d, 0x61, 0x6b, 0x65, 0x20, 0x7a, 0x75, 0x72, 0x69, 0x63, 0x68 };
  if (join_state == OK) {
    modem.send(payload, 11);
  }
}