Distibuted payload (message) to one connection
    :param conn: connection
    :param payload: payload(json dumpable)
    :return:

def target_message(conn, payload):
    """
    Distibuted payload (message) to one connection
    :param conn: connection
    :param payload: payload(json dumpable)
    :return:
    """
    try:
        yield from conn.send(json.dumps(payload))
    except Exception as e:
        logger.debug('could not send', e)