Implement returning the output of a method call in the status field of the broker message (similar to reads etc.).

Author: barnstee

KafkaClient.cs

@@ -105,7 +105,7 @@ private void HandleCommand()
                     // route this to the right handler
                     if (request.Command == "MethodCall")
                     {
-                        new UAClient().ExecuteUACommand(_appConfig, requestPayload);
+                        response.Status = new UAClient().ExecuteUACommand(_appConfig, requestPayload);
                         Log.Logger.Information($"Call succeeded, sending response to broker...");
                         response.Success = true;
                     }

MQTTClient.cs

@@ -269,7 +269,7 @@ private async Task HandleMessageAsync(MqttApplicationMessageReceivedEventArgs ar
                 // route this to the right handler
                 if (request.Command == "MethodCall")
                 {
-                    new UAClient().ExecuteUACommand(_uAApplication, requestPayload);
+                    response.Status = new UAClient().ExecuteUACommand(_uAApplication, requestPayload);
                     response.Success = true;
                 }
                 else if (request.Command == "Read")

UAClient.cs

@@ -9,7 +9,7 @@ namespace Opc.Ua.Cloud.Commander
 
     public class UAClient
     {
-        public void ExecuteUACommand(ApplicationConfiguration appConfiguration, string payload)
+        public string ExecuteUACommand(ApplicationConfiguration appConfiguration, string payload)
         {
             Session session = null;
 
@@ -66,6 +66,18 @@ public void ExecuteUACommand(ApplicationConfiguration appConfiguration, string p
                 {
                     throw new ServiceResultException(new ServiceResult(results[0].StatusCode, 0, diagnosticInfos, responseHeader.StringTable));
                 }
+
+                // put the results in a comma-seperated string
+                string result = string.Empty;
+                if ((results?.Count > 0) && (results[0].OutputArguments != null) && (results[0].OutputArguments.Count > 0))
+                {
+                    foreach (Variant argument in results[0].OutputArguments)
+                    {
+                        result += argument.ToString() + ',';
+                    }
+                }
+
+                return result.TrimEnd(',');
             }
             catch (Exception ex)
             {