SetWillMessage
SetWillMessage(topic AS String[, payload AS String[, qos AS Integer [, retain AS Boolean]]]) As Integer
Set Last Will and Testament (LWT) to use for the connection.
Parameters:
- Topic: the topic that the message should be published on
- Payload: the message to send.
- Qos: the quality of service level to use (possible values: 0, 1 or 2).
- Retain: if set to True, the message will be set as the retained message for the topic.
Returns 0 if success, otherwise the error code.