Azure IoT Development Cookbook

How to do it...

In this section we will send a cloud-to-device message. Upon receiving it, the IoT device will perform an action:

1. Send a cloud-to-device message from a cloud solution to an IoT device:

ServiceClient serviceClient;serviceClient = ServiceClient.CreateFromConnectionString(abc.GetConnectionString());abc.SendCloudToDeviceMessageAsync(deviceId, serviceClient);

2. Prepare and send messages:

var commandMessage = new Message(Encoding.ASCII.GetBytes("Close=100")); await serviceClient.SendAsync(deviceId, commandMessage);

3. The IoT device will reply by sending an acknowledgement message:

 while (true) { Message receivedMessage = await deviceClient.ReceiveAsync(); if (receivedMessage == null) continue; var cmdMessage = Encoding.ASCII.GetString(receivedMessage.GetBytes()); ...