Metachannel

Bayeux contains three types of channels: metachannels, service, and normal channels. Metachannels are created by the Bayeux server. Metachannels give information about events, such as handshake errors, connection, disconnection, and reconnection.

The cipher_ID and digest_ID are the OpenSSL cipher and digest types—Blowfish and SHA1 by default—that this node will use for the data channel and also to encrypt the metachannel.