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CONFIGURE THE DEVICE AS A MQTT CLIENT
In the Microsoft Azure Portal, go to IoT Hub menu and select:
Devices > myCreatedDevice > Shared access policies > iothubowner > Connection string - primary key.
User has to annotate the value of this field.
1. Get the connection string. Click the IoT Hub -> Shared access policies.
2. Click registryReadWrite -> copy the Connection string---Primary Key.