IPWorks MQ 2020 ActiveX Edition

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Connect Method

Connects to the remote host.

Syntax

mqttcontrol.Connect Host, Port

Remarks

This method connects to the remote host. Calling this method is equivalent to setting the RemoteHost property to Host, setting RemotePort to Port, and then setting the Connected property to True.

By default the control will connect in plaintext. To enable SSL set SSLEnabled to True.

In addition, WebSocket connections are supported. To connect using WebSockets specify a hostname beginning with ws:// (plaintext) or wss:// (SSL). For instance, ws://test.mosquitto.org.

When connecting to an MQTT server, the control sends the following information:

If CleanSession is True, check the SessionPresent configuration setting once connected to determine whether the server actually had any session state saved.

Refer to CleanSession, SaveSession, and RestoreSession for more information about MQTT sessions and session state persistence; refer to WillTopic, WillMessage, WillQOS, and WillRetain for more information about MQTT Wills.

Basic Connection Example

mqtt1.ClientId = "testClient";
mqtt1.CleanSession = true;
mqtt1.KeepAliveInterval = 30;
mqtt1.WillTopic = "wills/" + mqtt1.ClientId;
mqtt1.WillMessage = mqtt1.ClientId + " was disconnected ungracefully!";
mqtt1.Connect("mqtt.test-server.com", 1883);

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IPWorks MQ 2020 ActiveX Edition - Version 20.0 [Build 8162]