code: def start_app_and_connect(self):
          
          try:
              self._start_app_and_connect()
          except AppStartPreCheckError:
              # Precheck errors don't need cleanup, directly raise.
              raise
          except Exception as e:
              # Log the stacktrace of `e` as re-raising doesn't preserve trace.
              self._ad.log.exception('Failed to start app and connect.')
              # If errors happen, make sure we clean up before raising.
              try:
                  self.stop_app()
              except:
                  self._ad.log.exception(
                      'Failed to stop app after failure to start and connect.')
              # Explicitly raise the original error from starting app.
              raise e
docs: Starts snippet apk on the device and connects to it.
  
          This wraps the main logic with safe handling
  
          Raises:
              AppStartPreCheckError, when pre-launch checks fail.