MLLP.EchoDispatcher.dispatch

You're seeing just the function dispatch, go back to MLLP.EchoDispatcher module for more information.
Link to this function

dispatch(atom, message, state)

Specs

dispatch(:mllp_hl7 | :mllp_unknown, binary(), MLLP.FramingContext.t()) ::
  {:ok, MLLP.FramingContext.t()}

Callback implementation for MLLP.Dispatcher.dispatch/3.