Develop the subscriber NetLogic and interface

Develop a NetLogic and integrate it with the interface.
  1. Develop the NetLogic
  2. Right-click
    MainWindow (type)
    and select
    New
    Runtime NetLogic
    .
  3. Hover-over the NetLogic, select
    Edit
    , and enter
    SubscriberLogic
    .
  4. Double-click the NetLogic.
    The external code editor opens.
  5. In the code editor, replace the existing code with the following code:
    #region StandardUsing using System; using FTOptix.CoreBase; using FTOptix.HMIProject; using UAManagedCore; using OpcUa = UAManagedCore.OpcUa; using FTOptix.NetLogic; using FTOptix.UI; using FTOptix.OPCUAServer; #endregion using uPLibrary.Networking.M2Mqtt; using uPLibrary.Networking.M2Mqtt.Messages; public class SubscriberLogic : BaseNetLogic { public override void Start() { var brokerIpAddressVariable = Project.Current.GetVariable("Model/BrokerIpAddress"); // Create a client connecting to the broker (default port is 1883) subscribeClient = new MqttClient(brokerIpAddressVariable.Value); // Connect to the broker subscribeClient.Connect("
    SubscriberClient
    "); // Assign a callback to be executed when a message is received from the broker subscribeClient.MqttMsgPublishReceived += SubscribeClientMqttMsgPublishReceived; // Subscribe to the "my_topic" topic with QoS 2 ushort msgId = subscribeClient.Subscribe(new string[] { "/my_topic" }, // topic new byte[] { MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE }); // QoS level messageVariable = Project.Current.GetVariable("Model/Message"); } public override void Stop() { subscribeClient.Unsubscribe(new string[] { "/my_topic" }); subscribeClient.Disconnect(); } private void SubscribeClientMqttMsgPublishReceived(object sender, MqttMsgPublishEventArgs e) { messageVariable.Value = "Message received: " + System.Text.Encoding.UTF8.GetString(e.Message); } private MqttClient subscribeClient; private IUAVariable messageVariable; }
  6. Save the code.
  7. Create the interface elements
  8. Create the message variable:
    1. In
      Project view
      , right-click
      Model
      and select
      New
      Variable
      .
    2. Hover-over the variable, select
      Edit
      , and enter
      Message
      .
    3. In
      Properties
      , select
      Int32
      and select
      String
      .
  9. Create the Subscribe label:
    1. In
      Project view
      , right-click
      MainWindow (type)
      and select
      New
      Base controls
      Label
      .
    2. Hover-over the label, select
      Edit
      , and enter
      SubscribeLabel
      .
    3. In
      Properties
      , create a dynamic link between
      Text
      and the
      Message
      variable.
      For more information about dynamic links, see Create dynamic links.
  10. Arrange the interface elements.
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