Use static mqtt client in hub. Getting queue is empty excpetion

Pi.Hub.Api/Controllers/StatusController.cs

@@ -13,6 +13,14 @@ namespace Pi.Hub.Api.Controllers
     [Route("api/[controller]")]
     public class StatusController : Controller
     {
+
+        static StatusController(){
+            Client = new MqttClient("test.mosquitto.org");
+            Client.Connect(Guid.NewGuid().ToString());
+        }
+
+        static MqttClient Client;
+
         [HttpGet]
         [Route("[action]")]
         public object Now()
@@ -25,11 +33,11 @@ namespace Pi.Hub.Api.Controllers
         public object Write([FromBody]object obj)
         {
             string serialized = JsonConvert.SerializeObject(obj);
-            var client = new MqttClient("test.mosquitto.org");
+            // var client = 
             string topic =  "e1s/iot.challange" ;
-            client.Connect(Guid.NewGuid().ToString());
-            client.Publish(topic, Encoding.UTF8.GetBytes(serialized),MqttMsgBase.QOS_LEVEL_AT_LEAST_ONCE, false);
-            client.Disconnect();
+            // client.Connect(Guid.NewGuid().ToString());
+            Client.Publish(topic, Encoding.UTF8.GetBytes(serialized));
+            // client.Disconnect();
   
             return new
             {

Pi.Hub.Api/Program.cs

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

Pi.Hub.Api/appsettings.json

 {
     "PiHub": {
-        "Address": "10.0.200.22",
+        "Address": "10.0.100.8",
         "Port": 5000
     },
     "Logging": {