iothub-message-schema: twinChangeNotification

Question

Hi

I would like to know if there is a way to de-serialize data from the Azure function that is triggered when the reported property is updated in the IoT Hub Device Twin? Is there any schema or predefined class in EventData SDK that can be mapped to the EventData.Body?

// example code.
       [FunctionName("IotMessage")]
            public async void Run([IoTHubTrigger("messages/events", Connection = "iotConnection", ConsumerGroup = "functionapp")]EventData message, ILogger log)
      {
    // iothub-message-schema: twinChangeNotification?
      var JsonString1 = Encoding.UTF8.GetString(message.Body.Array);

    }

Answer 1

Hello @Chandra Mohan ,

There are many ways to de-serialize the dynamic Json object, below is one among them, please give a try and check if it works for you.

dynamic stuff = JsonConvert.DeserializeObject(JsonString1);

   [FunctionName("Function1")]  
        public static void Run([IoTHubTrigger("messages/events", Connection = "ConnectionString", ConsumerGroup = "funcgroup")]EventData message, ILogger log)  
        {  
            log.LogInformation($"C# IoT Hub trigger function processed a message: {Encoding.UTF8.GetString(message.Body.Array)}");  
  
            var JsonString1 = Encoding.UTF8.GetString(message.Body.Array);  
  
            dynamic stuff = JsonConvert.DeserializeObject(JsonString1);  
  
        }  

• Also Please do visit this document : Process reported properties

Please visit the Azure IoT Samples-C-sharp for more info