Connecting Arduino MKR 1010 WiFi to Azure IoT Hub Device

Question

Hi Community fam,I am facing some issues connecting my Arduino MKR 1010 to Azure IoT Hub and I do not have any other options than open a discussion here. I really hope that someone will be able to help. So, what I did is:1. Create CA signed certificate, using ECC algorithm for signing, following this guide -&nbsp;https://github.com/Azure/azure-iot-sdk-c/blob/main/tools/CACertificates/CACertificateOverview.md2. Then, generated leaf certificate for my IoT Hub Device, again using the CACertificates scripts.3. I create IoT Hub where I created a device with authentication type: X509 CA Signed certificate.4. Afterwards, I created the Device Provisioning Service that is connect to the create IoT Hub.5. I added the Root certificate that was generated in the first step.6. Then, I used the following code:&nbsp;https://github.com/Vitomir2/Digital-Twins-Azure-IoT-Hub/blob/main/source/auth-x509-certs-arduino-sketches/authentication-x509-certificates-2/authentication-x509-certificates-2.ino7. After uploading the code on the board, it returns me: Connect Error: -2. I know this error comes from the MQTT and not exactly from the Azure, but I hope someone will have experience with that.Just tell me if you need more information about my setup, but basically, in summary that is it.Any help will be appreciated and also I am in a hurry a lot, because I have deadline to finish some measurements when connect successfully to the IoT Hub device.#iot-hub, #x509-certificate #arduinoBest regards,Vitomir

mgungor · Answer

VPavlov&nbsp;Have you found a solution for that?Have you seen this post:&nbsp;https://paul-bruffett.medium.com/iot-azure-pipeline-9725ac2b6a00&nbsp;

vpavlov · Answer

mgungor&nbsp;I have not, but I decided to proceed with just a self-signed X509 certificate just to finish my project, because my deadline was 30th of August.About the post you forwarded, I think I have seen it before, but it uses SAS token for the authentication, however, I had to use X509 CA signed certificate. Thanks for the highlight.I plan to create my own example and to push it to an Arduino Library, but not sure if I am going to have time for this. If you also need this, but you have time to wait, I raised a ticket on github for sample how the X509 CA Signed certificate authentication can be used with boards that use ATECC508/608 crypto chips.BR,Vitomir

henderjl · Answer

VPavlov&nbsp;Do you still need help with this? I have numerous Arduino devices connected to my Azure IOT Hub and I can show you an easy way to do this.

mkgungor · Answer

That would be great actually, why don't you make a video and post on youtube - then everyone else would benefit.

henderjl · Answer

mkgungor&nbsp;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.&nbsp;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.&nbsp;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 &gt;_ 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 &lt;device name&gt; -n &lt;hub name&gt; --du 63072000"without the quotes. Use your names for the items marked with &lt;&gt;. Do not use the &lt;&gt;.5. To monitor your device in the Azure terminal, enter:"az iot hub monitor-events -n &lt;hub name&gt; -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 (&lt;&gt;). Do not use the carets.Let me know how you make out.&nbsp;// 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 &lt;WiFiNINA.h&gt;
 #include &lt;MQTT.h&gt;
 #include &lt;Arduino.h&gt;

// Azure hub connection info
const char server[] = "&lt;YourHubName&gt;.azure-devices.net";
const char clientId[] = "MKRTest"; //Device must be created in Azure IOT Hub.
const char username[] = "&lt;YourHubName&gt;.azure-devices.net/MKRTest/api-version=2016-11-14";
const char password[] = "SharedAccessSignature sr=&lt;YourSASToken&gt;"; //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("&lt;YourWiFiSSID&gt;","&lt;YourWiFiPassword&gt;");
  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);
}&nbsp;&nbsp;

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Connecting Arduino MKR 1010 WiFi to Azure IoT Hub Device

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