Fired when a connection is closed.
Sub mqttcontrol_Disconnected(StatusCode As Integer, Description As String)
If the connection is broken normally, StatusCode is 0 and Description is "OK".
If the connection is broken for any other reason, StatusCode has the error code returned by the TCP/IP subsystem. Description contains a description of this code. The value of StatusCode is equal to the value of the TCP/IP error. The corresponding Visual Basic error code can be obtained by adding 15001 to this value.
Please refer to the Error Codes section for more information.