Connect with azure iot hub with certificate based in react native.

[Shahanshah-TA]

Hi
I am trying to connect with azure iot hub using mqtt client, and it required to have certificate based connection.
I tried with mosquitto and its working fine.
But with certification when I am trying to connect, its not working.

What I have tried is

  const port = 8883;
  const protocolVersion = 3;
 const protocol = "mqtts";
const client = mqtt
      .connect(`${protocol}://${host}`, {
        port,
        protocolVersion,
        protocol,
        clientId: deviceId,
        reconnectPeriod: 5000,
        queueQoSZero: true,
        resubscribe: true,
       username: username,
       password: password,
        clean: true,
        keepalive: 30,
        ca: certificate_string_here,
        // tls:{
        //ca: certificate_string_here,
       //}
        properties:
          protocolVersion === 5
            ? {
                sessionExpiryInterval: 600,
              }
            : undefined,
      })
      .on('connect', () => {
        console.log('Connected to MQTT');
      })
      .on('error', error => {
        console.log('error to MQTT');
      })
      .on('disconnect', packet => {
        console.log('disconnect to MQTT');
      })
      .on('offline', () => {
        console.log('offline to MQTT');
      })
      .on('reconnect', () => {
        console.log('reconnect to MQTT');
      })
      .on('close', () => {
        console.log('close to MQTT');
      })
      .on('message', (topic, message, packet) => {
        console.log('message to MQTT');
      });

I want to have something like this, its in python just for reference.

client = mqtt.Client(client_id=device_id, protocol=mqtt.MQTTv311)

client.on_connect = on_connect
client.on_disconnect = on_disconnect
client.on_publish = on_publish

client.username_pw_set(username=iot_hub_name+".azure-devices.net/" +
                       device_id + "/?api-version=2021-04-12", password=sas_token)

client.tls_set(ca_certs=path_to_root_cert, certfile=None, keyfile=None,
               cert_reqs=ssl.CERT_REQUIRED, tls_version=ssl.PROTOCOL_TLSv1_2, ciphers=None)
client.tls_insecure_set(False)

client.connect(iot_hub_name+".azure-devices.net", port=8883)

client.publish("devices/" + device_id + "/messages/events/", '{"id":123}', qos=1)

Please help me with this
Thank you

[robertsLando]

What's the error? Is the cert/key self signed? If so you should add rejectUnhauthorized: false to the options

[Shahanshah-TA]

I have updated the code like this

mqtt
      .connect(`mqtts://${host}:8883`, {
        port,
        protocolVersion,
        protocol,
        clientId: deviceId,
        reconnectPeriod: 5000,
        queueQoSZero: true,
        resubscribe: true,
        clean: true,
        username: user,
        password: sasToken,
        ca: cert_file,
        rejectUnauthorized: false,
        keepalive: 100,
        properties:
          protocolVersion === 5
            ? {
                sessionExpiryInterval: 600,
              }
            : undefined,
      })

I am not getting error, its just getting offline, then close and then keep reconnecting. I checked Adb logcat also in Android, but got nothing there too.

[robertsLando]

without logs it's difficult to help you here, anyway I suggest to check if you get some logs on broker side that could help you with this.

Also ensure there is not another client with same clientId connected to the broker as this would lead to broker disconnecting the clients