Develop the publisher NetLogic and interface

Develop a NetLogic and integrate it with the interface.
  1. Develop the NetLogic
  2. In
    Project view
    , expand
    UI
    .
  3. Right-click
    MainWindow (type)
     and select
    New
    Runtime NetLogic
    .
  4. Hover-over the NetLogic, select
    Edit
    , and enter
    PublisherLogic
    .
  5. Double-click the NetLogic.
    The external code editor opens.
  6. 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 PublisherLogic : BaseNetLogic
{
    public override void Start()
    {
        var brokerIpAddressVariable = Project.Current.GetVariable("Model/BrokerIpAddress");

        // Create a client connecting to the broker (default port is 1883)
        publishClient = new MqttClient(brokerIpAddressVariable.Value);
        // Connect to the broker
        publishClient.Connect("
    PublisherClient
    ");
        // Assign a callback to be executed when a message is published to the broker
        publishClient.MqttMsgPublished += PublishClientMqttMsgPublished;
    }

    public override void Stop()
    {
        publishClient.Disconnect();
        publishClient.MqttMsgPublished -= PublishClientMqttMsgPublished;
    }

    private void PublishClientMqttMsgPublished(object sender, MqttMsgPublishedEventArgs e)
    {
        Log.Info("Message " + e.MessageId + " - published = " + e.IsPublished);
    }

    [ExportMethod]
    public void PublishMessage()
    {
        var variable1 = Project.Current.GetVariable("Model/Variable1");
        variable1.Value = new Random().Next(0, 101);

        // Publish a message
        ushort msgId = publishClient.Publish("/my_topic", // topic
            System.Text.Encoding.UTF8.GetBytes(((int)variable1.Value).ToString()), // message body
            MqttMsgBase.QOS_LEVEL_EXACTLY_ONCE, // QoS level
            false); // retained
    }

    private MqttClient publishClient;
}
    NOTE: The code retrieves the value to publish from the
    Model
    Variable1
     variable that you will create later on.
  7. Save the code.
  8. Create the interface elements
  9. In
    Project view
    , right-click
    Model
     and select
    New
    Variable
    .
    If needed, rename the variable to
    Variable1
    .
    Variable1
     is created. The variable value is retrieved by the
    PublisherLogic
     script.
  10. Add the publish button by performing the following actions:
    1. In
      Project view
      , right-click
      MainWindow (type)
       and select
      New
      Base controls
      Button
      .
    2. Hover-over the button, select
      Edit
      , and enter
      PublishButton
      .
    3. In
      Properties
      , set
      Text
       to
      Publish
    4. In
      Events
      , next to
      MouseClick event
      , select
      Add
       and select
      ProjectName
      UI
      MainWindow (type)
      PublisherLogic
      PublishMessage
      .
Provide Feedback
Have questions or feedback about this documentation? Please submit your feedback here.