Connecting Arduino MKR 1010 WiFi to Azure IoT Hub Device

mkgungor 

I appreciate your suggestion about posting on Youtube, however, I don't believe that code writing lends itself very well to video. I get weary of watching people correcting their typos.

Here is a very simple way to send MQTT data to an Azure IOT hub. The following uses a simplified ketch to connect to Wifi, connect to Azure using MQTT, and then send a packet of data to the hub, in this case it is sending the elapsed time in milliseconds.

Procedure:

1. Create an IOT Hub in Azure.

2. In the hub, create a device. The only entry needed is a name for the device, in this case I will use "MKRTest", but it can be anything.

3. Open the Azure terminal using the >_ icon at the top of the page. Add the CLI extension by entering "az extension add --name azure-cli-iot-ext" without the quotes.

4. To get a token for your device enter:

"az iot hub generate-sas-token -d <device name> -n <hub name> --du 63072000"

without the quotes. Use your names for the items marked with <>. Do not use the <>.

5. To monitor your device in the Azure terminal, enter:

"az iot hub monitor-events -n <hub name> -t 0 --output table", again no quotes.

6. Download and run the following sketch on your MKR Wifi 1010. Add your data in the values marked with the carets (<>). Do not use the carets.

Let me know how you make out.

// Sketch for Arduino MKR WiFi 1010

// Libraries
// Uses WiFiNINA https://www.arduino.cc/en/Reference/WiFiNINA
// Search on "Nina".
// Joël Gähwiler's MQTT Library https://github.com/256dpi/arduino-mqtt
// Search on "lwmqtt".
 #include <WiFiNINA.h>
 #include <MQTT.h>
 #include <Arduino.h>

// Azure hub connection info
const char server[] = "<YourHubName>.azure-devices.net";
const char clientId[] = "MKRTest"; //Device must be created in Azure IOT Hub.
const char username[] = "<YourHubName>.azure-devices.net/MKRTest/api-version=2016-11-14";
const char password[] = "SharedAccessSignature sr=<YourSASToken>"; //Get in Azure terminal.
String feedbackTopic = "devices/MKRTest/messages/events/";
String payload;

WiFiSSLClient net;
MQTTClient mqtt(1024); 

void setup() {
  //Start serial. Wait for it to start.
  Serial.begin(9600);
  while (!Serial) { } //This for interactive use only. Outside the IDE, it will loop forever.
  Serial.println();
  Serial.println("Serial started");
  
  //Connect WiFi
  Serial.println("Connecting WiFi");
  WiFi.begin("<YourWiFiSSID>","<YourWiFiPassword>");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(5000);
  }
  Serial.print("IP address = ");
  Serial.println( WiFi.localIP());

  //Connect MQTT
  Serial.println("Connecting MQTT");
  mqtt.begin(server, 8883, net);
  mqtt.loop();
  while (!mqtt.connect(clientId, username, password)){
    Serial.print(".");
    delay(5000);
  }
  Serial.print("mqtt.connected=");
  Serial.println(mqtt.connected());
}

void loop() {
  payload="Mkr1010 " + String(millis());
  Serial.println(payload);
  mqtt.publish(feedbackTopic, payload);   
  delay(10000);
}