trigger MQTT broker to publish will message with Paho Java client

Question

I'm using Paho Java client currently, is it possible to trigger the broker to send the will message in code? since using disconnect() will not result in a will message being sent by the broker

Answer 1

Try to kill client pid form terminal. This should trigger LWT after standard MQTT timeouts.

Answer 2

No, that's not how the LWT works.

The broker will only publish the LWT if the client times out (or the socket drops) without the client sending a disconnect message.

There is nothing to stop you manually publishing the same message before calling disconnect()