Switch back to MQTT as default transport (#55)

Author: LazarusX

content/dotnet-template-azure-iot-edge-module/CSharp/Program.cs

@@ -9,6 +9,7 @@ namespace SampleModule
     using System.Threading;
     using System.Threading.Tasks;
     using Microsoft.Azure.Devices.Client;
+    using Microsoft.Azure.Devices.Client.Transport.Mqtt;
 
     class Program
     {
@@ -41,8 +42,8 @@ public static Task WhenCancelled(CancellationToken cancellationToken)
         /// </summary>
         static async Task Init()
         {
-            AmqpTransportSettings amqpSetting = new AmqpTransportSettings(TransportType.Amqp_Tcp_Only);
-            ITransportSettings[] settings = { amqpSetting };
+            MqttTransportSettings mqttSetting = new MqttTransportSettings(TransportType.Mqtt_Tcp_Only);
+            ITransportSettings[] settings = { mqttSetting };
 
             // Open a connection to the Edge runtime
             ModuleClient ioTHubModuleClient = await ModuleClient.CreateFromEnvironmentAsync(settings);