gbp-protocol

The Group Broadcast Protocol base layer: the framing, control plane and error object that the three sub-protocols (gtp-protocol, gap-protocol, gsp-protocol) build on top of, the same way TCP and UDP build on top of IP.

This crate provides:

• [GbpFrame] — the CBOR-encoded transport frame with version, group_id, epoch, transition_id, stream_type, stream_id, flags, sequence_no and the encrypted payload.
• [ControlMessage] — the CBOR-encoded control plane message format.
• [ErrorObject] — the wire-serialisable error object referenced by the registry in gbp-core.
• [CodecError] — a unified codec error type used by every codec in the stack.

Wire format

Frames are encoded with deterministic CBOR (RFC 8949). Every frame is self-describing and validated up-front against the constraints in §6.2 of the GBP specification (version, group_id length, epoch, payload_size).

License

Licensed under Apache License, Version 2.0.