//----------------------------------------------------------------


// EasyUA Client Sample Application


// ================================


// This Windows Console application uses the EasyUA methods to read/write data from an OPC UA server.


//


// Copyright 2017 Advosol Inc.


// All rights reserved.


// THIS CODE AND INFORMATION ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY


// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE


// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.


//----------------------------------------------------------------


using System;


using System.Collections.Generic;


using System.Linq;


using System.Text;


using Advosol.EasyUA;


using Opc.Ua;


namespace ConsoleAppSample


{


   class Program


   {


      static string appName = "EasyUA Sample";


      static string testServer = "opc.tcp://localhost:62849/Advosol/uaPLUSsim/discovery";


      static string readNode = "ns=2;s=SimulatedData.Ramp";


      static string writeNode = "ns=2;s=Static.Simple Types.Int";


 
      //---------------------------------------------------------------


      // The application connects to the UA server and creates a subscritpion for one item.


      // Data change notifications display the value and write the value to another item in the same server.


      static void Main(string[] args)


      {


         try


         {


            UaClient.UaAppConfigFileAutoCreate = appName; // auto create a default UA config file


            uaApp = new UaClient(null);


            uaApp.LoadConfiguration();


            session = uaApp.CreateSession(testServer, false, "test");


            //session.StatusChange += new OnStatusChange(onSessionStatusChange);


            session.Connect(null);


      

            writeNodeInfo = session.ReadNode(writeNode); // read the node details to get the datatype


            //--------------- add Subscription and MonitoredItem


            session.SubscriptionRequestKeepaliveCount = 5;


            subscr = session.AddSubscription("s1", 500);


            //subscr.DataChangeCallback += onSubscrDataChangeNotification; // notification on subscription level


            miRamp = subscr.AddItem(readNode);


            miRamp.Notification += new OnMonitoredItemNotification(miRamp_Notification); // notification for this MonitoredItem


            subscr.ApplyChanges(); // create in the server


      



            Console.WriteLine("UA server access working. Type RETURN to terminate.");


            Console.ReadLine();


            subscr.Dispose();


            session.Close();


            session.Dispose();


            //---------------- exit


         }


         catch (Exception ex)


         {


            Console.WriteLine("Accessing server failed: " + ex.Message);


            Console.ReadLine();


            return; // exit


         }


      }


      




      static UaClient uaApp;




      static Session session = null;





      static Subscription subscr = null;



      static MonitoredItem miRamp = null;
      static Node writeNodeInfo;


　

      //----------------------------------------------------------------------------------
      // Handler for data change notifications from MonitoredItems.
      // The method handles the data only if the handling on MonitoredItem level is selected.
      // The different handlers are implemented to demonstrate the handling options.


      static void miRamp_Notification(MonitoredItem monitoredItem, IEncodeable notification)
      {
         try
         {
            MonitoredItemNotification dataChange = notification as MonitoredItemNotification;

            if (dataChange != null)

            {

               object val = dataChange.Value.Value; // the changed value of the subscribed MonitoredItem


               WriteValue wval = session.MakeWriteValue((VariableNode)writeNodeInfo, val); // object with NodeId and type converted value
               session.WriteAttribute(wval); // write value to another node


               Console.Write(val.ToString() + " ");
            }

         }

         catch (Exception ex)
         {
            Console.WriteLine(monitoredItem.DisplayName + ": " + ex.Message);
         }
      }

   }


}