This is a demo MakerFabs Maduino LoRa Radio 868MHz client (based on one of the examples from Arduino-LoRa) that uploads telemetry data to my Windows 10 IoT Core on Raspberry PI AdaFruit.IO and Azure IoT Hub field gateways.

The code is available on Github

/*
Adapted from LoRa Duplex communication with Sync Word  Sends temperature & humidity data from Seeedstudio   https://www.seeedstudio.com/Grove-Temperature-Humidity-Sensor-High-Accuracy-Min-p-1921.html  To my Windows 10 IoT Core RFM 9X library  https://blog.devmobile.co.nz/2018/09/03/rfm9x-iotcore-payload-addressing/*/#include               // include libraries#include#includeconst int csPin = 10;          // LoRa radio chip selectconst int resetPin = 9;       // LoRa radio resetconst int irqPin = 2;         // change for your board; must be a hardware interrupt pin// Field gateway configurationconst char FieldGatewayAddress[] = "LoRaIoT1";const float FieldGatewayFrequency =  915000000.0;//const float FieldGatewayFrequency =  433000000.0;const byte FieldGatewaySyncWord = 0x12 ;// Payload configurationconst int PayloadSizeMaximum = 64 ;byte payload[PayloadSizeMaximum] = "";const byte SensorReadingSeperator = ',' ;// Manual serial number configurationconst char DeviceId[] = {"Maduino1"};const int LoopSleepDelaySeconds = 10 ;void setup() {  Serial.begin(9600);  while (!Serial);  Serial.println("LoRa Setup");  // override the default CS, reset, and IRQ pins (optional)  LoRa.setPins(csPin, resetPin, irqPin);// set CS, reset, IRQ pin  if (!LoRa.begin(FieldGatewayFrequency))  {    Serial.println("LoRa init failed. Check your connections.");    while (true);  }  // Need to do this so field gateways pays attention to messsages from this device  LoRa.enableCrc();  LoRa.setSyncWord(FieldGatewaySyncWord);    //LoRa.dumpRegisters(Serial);  Serial.println("LoRa Setup done.");  // Configure the Seeedstudio TH02 temperature & humidity sensor  Serial.println("TH02 setup");  TH02.begin();  delay(100);  Serial.println("TH02 Setup done");    Serial.println("Setup done");}void loop(){  int payloadLength = 0 ;  float temperature ;  float humidity ;  Serial.println("Loop called");  memset(payload, 0, sizeof(payload));  // prepare the payload header with "To" Address length (top nibble) and "From" address length (bottom nibble) << 4) | strlen( DeviceId ) ;  payloadLength += 1;  // Copy the "To" address into payload  memcpy(&payload[payloadLength], FieldGatewayAddress, strlen(FieldGatewayAddress));  payloadLength += strlen(FieldGatewayAddress) ;  // Copy the "From" into payload  memcpy(&payload[payloadLength], DeviceId, strlen(DeviceId));  payloadLength += strlen(DeviceId) ;  // Read the temperature and humidity values then display nicely  temperature = TH02.ReadTemperature();  humidity = TH02.ReadHumidity();  Serial.print("T:");  Serial.print( temperature, 1 ) ;  Serial.print( "C" ) ;  Serial.print(" H:");  Serial.print( humidity, 0 ) ;  Serial.println( "%" ) ;  // Copy the temperature into the payload  payload[ payloadLength] = 't';  payloadLength += 1 ;  payload[ payloadLength] = ' ';  payloadLength += 1 ;  payloadLength += strlen( dtostrf(temperature, -1, 1, (char*)&payload[payloadLength]));  payload[ payloadLength] = SensorReadingSeperator;  payloadLength += sizeof(SensorReadingSeperator) ;  // Copy the humidity into the payload  payload[ payloadLength] = 'h';  payloadLength += 1 ;  payload[ payloadLength] = ' ';  payloadLength += 1 ;  payloadLength += strlen( dtostrf(humidity, -1, 0, (char *)&[payloadLength]));    // display info about payload then send it (No ACK) with LoRa unlike nRF24L01  Serial.print( "RFM9X/SX127X Payload length:");  Serial.print( payloadLength );  Serial.println( " bytes" );  LoRa.beginPacket();  LoRa.write( payload, payloadLength );  LoRa.endPacket();        Serial.println("Loop done");  delay(LoopSleepDelaySeconds * 1000l);}

In the debugging output the data looked like this

13:40:28-RX From Maduino1 PacketSnr 9.8 Packet RSSI -65dBm RSSI -110dBm = 11 byte message "t 33.7,h 51"
 Sensor Maduino1t Value 33.7
 Sensor Maduino1h Value 51
 AzureIoTHubClient SendEventAsync start
 AzureIoTHubClient SendEventAsync finish
The thread 0x268 has exited with code 0 (0x0).
The thread 0xb28 has exited with code 0 (0x0).
13:40:38-RX From Maduino1 PacketSnr 9.5 Packet RSSI -66dBm RSSI -112dBm = 11 byte message "t 33.9,h 51"
 Sensor Maduino1t Value 33.9
 Sensor Maduino1h Value 51
 AzureIoTHubClient SendEventAsync start
 AzureIoTHubClient SendEventAsync finish
13:40:49-RX From Maduino1 PacketSnr 9.5 Packet RSSI -66dBm RSSI -110dBm = 11 byte message "t 34.0,h 51"
 Sensor Maduino1t Value 34.0
 Sensor Maduino1h Value 51
 AzureIoTHubClient SendEventAsync start
 AzureIoTHubClient SendEventAsync finish

Bill of materials (Prices Sep 2018)

• Maduino LoRa Radion (868MHz) USD14.10
• Seeedstudio Temperature&Humidity Sensor USD11.50
• 4 pin Female Jumper to Grove 4 pin Conversion Cable USD2.90
• 1 Watt solar panel with wires USD3.80
• 3000 mAh LI-Ion battery

There is also a 433MHz version available at the same price

The code is pretty basic, it shows how to pack the payload and set the necessary RFM9X/SX127X LoRa module configuration, has no power conservation, advanced wireless configuration etc.

The onboard sockets for battery and charging make the device easier to package and power in the field.

The Grove 4 pin Female Jumper to Grove 4 pin Conversion Cable was a quick & convenient way to get the I2C Grove temperature and humidity sensor connected up.

Then in my Azure IoT Hub monitoring software