Hub mqtt fixes:

Pi.Hub.Api/Controllers/StatusController.cs

@@ -25,14 +25,10 @@ namespace Pi.Hub.Api.Controllers
         public object Write([FromBody]object obj)
         {
             string serialized = JsonConvert.SerializeObject(obj);
-            //System.IO.File.AppendAllLines("C:\\apps\\msgs.txt", new[] { $",{{\"object\":{serialized},\"timestamp\":\"{DateTime.Now:F}\"}}" });
-
             var client = new MqttClient("test.mosquitto.org");
-            string[] topic = { "e1s/iot.challange" };
-            byte[] qosLevels = { MqttMsgBase.QOS_LEVEL_AT_LEAST_ONCE };
-            client.Subscribe(topic, qosLevels);
+            string topic =  "e1s/iot.challange" ;
             client.Connect(Guid.NewGuid().ToString());
-            client.Publish("e1s/iot.challange", Encoding.UTF8.GetBytes(serialized));
+            client.Publish(topic, Encoding.UTF8.GetBytes(serialized),MqttMsgBase.QOS_LEVEL_AT_LEAST_ONCE, false);
             client.Disconnect();
   
             return new

Pi.Hub.Api/Pi.Hub.Api.csproj

@@ -4,7 +4,6 @@
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp2.0</TargetFramework>
     <RuntimeIdentifiers>win-arm;linux-arm;x86</RuntimeIdentifiers>
-    <PackageTargetFallback>portable-net45+win8</PackageTargetFallback>
   </PropertyGroup>
 
   <ItemGroup>

Pi.Hub.Api/Program.cs

@@ -29,7 +29,8 @@ namespace Pi.Hub.Api
             WebHost
                 .CreateDefaultBuilder(args)
                 .UseStartup<Startup>()
-                .UseKestrel(opt => opt.Listen(IPAddress.Parse(configuration["PiHub:Address"]), int.Parse(configuration["PiHub:Port"])))
+                // .UseKestrel(opt => opt.Listen(IPAddress.Parse(configuration["PiHub:Address"]), int.Parse(configuration["PiHub:Port"])))
+                .UseKestrel()
                 .Build();
     }
 }