SMPPEX.Session.handle_timeout

You're seeing just the callback handle_timeout, go back to SMPPEX.Session module for more information.
Link to this callback

handle_timeout(arg1, state)

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Specs

handle_timeout(SMPPEX.SMPPTimers.stop_reason(), state()) ::
  exit_reason :: term()

Invoked when the session is about to be stopped due to a timeout.

The return value will be used as the exit reason of the session process. The default implementation returns {:timers, reason}.