from  https://github.com/theforeman/smart_proxy_remote_execution_ssh/pull/103#issuecomment-1764715852

Prerequisites:

1. have rex with pull mode
2. set time to pickup to something reasonable (a couple of minutes)
3. set mqtt_resend_interval to something low (~15 seconds)

Steps to reproduce:

1. Stop mosquitto
2. Run a REX job
3. Watch for traceback in proxy logs when it fails to connect to mosquitto
4. Start mosquitto
5. Wait

Actual results: The job eventually fails due to not being able to deal with the failure observed in 3 and then times out because of prerequisite 2

Expected results: The job tries to publish to mqtt every mqtt_resend_interval seconds until it succeeds, the whole job eventually succeeds