title: Routing Event Hub messages to Azure funtion by message type
body: <p>I've create an Azure Function to listen to an Azure IoT Hub instance. When I post message to the IoT Hub I set a property like so:</p>
  
  <pre><code>        Message iotMessage = new Message([myMessage]);
          iotMessage.Properties.Add("Type", [MessageType]);
  </code></pre>
  
  <p>At the Azure Function end I want the Azure function only to receive/process messages that have a Type property and where the Type property equals "MessageType1".</p>
  
  <p>I cannot see a way to do this in an Azure function. Can someone advise if this is possible?</p>