https://github.com/djaus2/mqttnet_azureiothubapps
Send Telemetry to an Azure IOT Hub using MQTTnet API. Also send CD Messages as well.
https://github.com/djaus2/mqttnet_azureiothubapps
iot-hub mqtt
Last synced: about 1 month ago
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Send Telemetry to an Azure IOT Hub using MQTTnet API. Also send CD Messages as well.
- Host: GitHub
- URL: https://github.com/djaus2/mqttnet_azureiothubapps
- Owner: djaus2
- License: cc0-1.0
- Created: 2023-10-06T11:17:10.000Z (over 1 year ago)
- Default Branch: master
- Last Pushed: 2023-10-15T09:00:52.000Z (over 1 year ago)
- Last Synced: 2025-04-23T18:19:29.609Z (about 1 month ago)
- Topics: iot-hub, mqtt
- Language: C#
- Homepage:
- Size: 71.3 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE.txt
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README
# MQTTnet for Azure IoT Hub Apps
## About
Send Telemetry to an Azure IoT Hub using MQTTnet API. Also send CD Messages as well.
- .Net Core 3.1 Console **_Works_**
- - Autogenerates SasToken from Secrets.cs (Device Primary Key) and uses that
- GenerateSas **_Works_**
- Generate SasToken, as per Console app, and copies to clipbaord for Medow app.
- Meadow app. **_Works_**
- Now using Meadow.MQTTnet Nuget package rather than MQTTnet package..
- _Does not use MQTTnet.Extensions.ManagedClient (as does Console app) as not supported._
- _SasTokens generated here don't connect. So paste token from GenerateSas app in Secrets.cs_
> Nb: **Cloud to Device Messages** are implmented including **Message Properties**. But **Direct Method**s are not implemented.
Also, no Modelling/Twinning implemented.
## Monitoring
Suggest using Azure IoT Explorer to monitor telemetry and to send CD messages. [About Azure IoT Explorer](https://learn.microsoft.com/en-us/azure/iot/howto-use-iot-explorer)
## Links
- [Blog about Meadow Project Lab](https://davidjones.sportronics.com.au/med/WildernessLabs_Project_Lab-About_Project_Lab_V3-med.html)
- https://github.com/dotnet/MQTTnet _(MQTTnet repository)_
- [Communicate with an IoT hub using the MQTT protocol](https://learn.microsoft.com/en-us/azure/iot/iot-mqtt-connect-to-iot-hub)
- https://dev.to/eduardojuliao/basic-mqtt-with-c-1f88 _(Console Code was derived from this)_
- Meadow Apps Start here: [djaus2/Meadow.ProjectLab.Extensions](https://github.com/djaus2/Meadow.ProjectLab.Extensions)
## Update
Now includes method to generate Sas Token from Device Primary Key.
Fails on Meadow so for that use GenerateSas or Powershell script _(as below)_ on AzCli to get fixed value.
## Sample Secrets.cs
```cs
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Globalization;
using System.IO;
using System.Net.Sockets
using System.Text;
namespace MeadowApplication3
{
public static class Secrets
{
/* Run GenerateSas first which provides a SasToken on the ClipBoard, so paste here then.
Alternative: Powershell Command to get SAS Token
az iot hub generate-sas-token --hub-name HUBNAME --device-id DEVICEID --resource-group AZURERESOURCEGROUP --login IOTHUBCONNECTIONSTRING
Also -du optional parameter for duration: Valid token duration in seconds. Default: 3600, 1 hr
*/
public static bool useThisSasToken = true;
public static string SasToken = "";
public static bool UseMQTTnetAPI = true;
public static int TelemetryPeriod = 3333;
public static string WIFI_NAME = "";
public static string WIFI_PASSWORD = "";
public static string IOT_CONFIG_IOTHUB_FQDN = "HUBNAME.azure-devices.net";
public static string DeviceId = "";
public static string HubName = "";
public static string DevicePrimaryKey = "";
public static int MqttPort = 8883;
//INFO https://learn.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-messages-c2d
public static string subTopic = "devices/+/messages/devicebound/#";
//INFO https://learn.microsoft.com/en-us/azure/iot-hub/iot-hub-devguide-messages-d2c
public static string pubTopic = $"\"devices/{DeviceId}/messages/events/\"";
public static string methodTopic =$"\"$iothub/methods/POST/#\"";
}
}
```