IoT.Net LoRa Radio 915 MHz Payload Addressing client

This is a demo ingenuity micro IoT.Net client (based on one of the examples in my RFM9XLoRaNetMF library) that uploads telemetry data to my Windows 10 IoT Core on Raspberry PI field gateway. 

Thought the silk screen says RFM69 this is a prototype running an RFM95 module.


Bill of materials (Prices Sep 2018)

  • IoT.Net device (Beta tester will add price when available)

The device has an onboard MCP9808 temperature sensor which kept the BoM really short. I have had to make some modifications to my RFM9XLoRaNetMF library as the IoT.Net device uses a different SPI port. The code for this devices and the changes will be uploaded to GitHub in the next couple of days.

// Copyright (c) Sept 2018, devMobile Software
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
// git remote add origin
// git push -u origin master
namespace devMobile.IoT.IoTNet.FieldGateway
	using System;
	using System.Text;
	using System.Threading;
	using Microsoft.SPOT;
	using Microsoft.SPOT.Hardware;
	using devMobile.IoT.NetMF.ISM;
	using IngenuityMicro.Sensors;

	class IoTNetClient
		private readonly Rfm9XDevice rfm9XDevice;
		private readonly TimeSpan dueTime = new TimeSpan(0, 0, 10);
		private readonly TimeSpan periodTime = new TimeSpan(0, 0, 30);
		private readonly MCP9808 mcp9808 = new MCP9808();
		private readonly OutputPort _led = new OutputPort((Cpu.Pin)16 + 8, false);
		private readonly byte[] fieldGatewayAddress = Encoding.UTF8.GetBytes("LoRaIoT1");
		private readonly byte[] deviceAddress = Encoding.UTF8.GetBytes("IoTNet1");

		public IoTNetClient()
			rfm9XDevice = new Rfm9XDevice( SPI.SPI_module.SPI3, (Cpu.Pin)16 + 9, (Cpu.Pin)5, (Cpu.Pin)4);

		public void Run()
			rfm9XDevice.Initialise(frequency: 915000000, paBoost: true, rxPayloadCrcOn: true);

			rfm9XDevice.OnDataReceived += rfm9XDevice_OnDataReceived;
			rfm9XDevice.OnTransmit += rfm9XDevice_OnTransmit;

			Timer temperatureUpdates = new Timer(TemperatureTimerProc, null, dueTime, periodTime);


		private void TemperatureTimerProc(object state)

			double temperature = mcp9808.ReadTempInC();

			Debug.Print(DateTime.UtcNow.ToString("hh:mm:ss") + "  T:" + temperature.ToString("F1"));

			rfm9XDevice.Send(fieldGatewayAddress, Encoding.UTF8.GetBytes("t " + temperature.ToString("F1")));


		void rfm9XDevice_OnTransmit()

		void rfm9XDevice_OnDataReceived(byte[] address, float packetSnr, int packetRssi, int rssi, byte[] data)
				string messageText = new string(UTF8Encoding.UTF8.GetChars(data));
				string addressText = new string(UTF8Encoding.UTF8.GetChars(address));

				Debug.Print(DateTime.UtcNow.ToString("HH:MM:ss") + "-Rfm9X PacketSnr " + packetSnr.ToString("F1") + " Packet RSSI " + packetRssi + "dBm RSSI " + rssi + "dBm = " + data.Length + " byte message " + @"""" + messageText + @"""");
			catch (Exception ex)

.Net Framework debug output Field Gateway

22:55:39-RX From IoTNet1 PacketSnr 9.5 Packet RSSI -50dBm RSSI -110dBm = 6 byte message "t 23.6"
 Sensor IoTNet1t Value 23.6
 AzureIoTHubClient SendEventAsync start
 AzureIoTHubClient SendEventAsync finish
The thread 0xbec has exited with code 0 (0x0).
The thread 0xbb4 has exited with code 0 (0x0).
The thread 0xa0c has exited with code 0 (0x0).
The thread 0x13c has exited with code 0 (0x0).
22:56:09-RX From IoTNet1 PacketSnr 9.3 Packet RSSI -44dBm RSSI -102dBm = 6 byte message "t 23.8"
 Sensor IoTNet1t Value 23.8
 AzureIoTHubClient SendEventAsync start
 AzureIoTHubClient SendEventAsync finish

A small footprint, battery powered .NetMF 4.4 LoRa device designed and made in New Zealand with Visual Studio 2017 support is great.

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