Converts Zebra protocol message instance to Zebra protocol service
    event instance.

    If corresponding event class is not defined, returns None.

    :param zclient: Zebra client instance.
    :param msg: Zebra protocol message.
    :return: Zebra protocol service event.

def message_to_event(zclient, msg):
    """
    Converts Zebra protocol message instance to Zebra protocol service
    event instance.

    If corresponding event class is not defined, returns None.

    :param zclient: Zebra client instance.
    :param msg: Zebra protocol message.
    :return: Zebra protocol service event.
    """
    if not isinstance(msg, zebra.ZebraMessage):
        return None

    body_cls = msg.get_body_class(msg.version, msg.command)
    ev_cls = getattr(MOD, _event_name(body_cls), None)
    if ev_cls is None:
        return None

    return ev_cls(zclient, msg)