"ID_UNCONNECTED_PING_OPEN_CONNECTIONS", 0x05 => "ID_OPEN_CONNECTION_REQUEST_1", 0x06 => "ID_OPEN_CONNECTION_REPLY_1", 0x07 => "ID_OPEN_CONNECTION_REQUEST_2", 0x08 => "ID_OPEN_CONNECTION_REPLY_2", 0x1c => "ID_UNCONNECTED_PONG", 0x1d => "ID_ADVERTISE_SYSTEM", );