code: def ping(awsclient, function_name, alias_name=ALIAS_NAME, version=None):
      
      log.debug('sending ping to lambda function: %s', function_name)
      payload = '{"ramuda_action": "ping"}'  # default to ping event
      # reuse invoke
      return invoke(awsclient, function_name, payload, invocation_type=None,
                    alias_name=alias_name, version=version)
docs: Send a ping request to a lambda function.
  
      :param awsclient:
      :param function_name:
      :param alias_name:
      :param version:
      :return: ping response payload