blind-relay

Blind relay for UDX over Protomux channels. By acting as a blind relay, a host may accept pairing requests from other hosts and relay UDX stream messages between them, similar to Traversal Using Relays around NAT (TURN).

``sh
npm i blind-relay
`

Protocol

`mermaid
sequenceDiagram
actor a as peer a
actor r as relay
actor b as peer b

par
a ->> r: pair { isInitiator: true, token, id, seq }
and
b ->> r: pair { isInitiator: false, token, id, seq }
end

note over r: The relay pairs peers a and b based on the token, allocates a new stream for both peers, and sends back the stream info

par
r -->> a: pair { isInitiator: true, token, id, seq }
and
r -->> b: pair { isInitiator: false, token, id, seq }
end

par
a ->> r: unpair { token }

note left of r: The relay deallocates the stream previously allocated to peer a
and
b ->> r: unpair { token }

note right of r: The relay deallocates the stream previously allocated to peer b
end
`

$3

All types are specified as their corresponding compact-encoding codec.

#### pair (0)

1. bitfield(1) Flags.
1. isInitiator
2. fixed32 Preexchanged token.
3. uint Stream ID of the sender.
4. uint Initial stream sequence no. of the sender.

#### unpair (1)

1. bitfield(0) Flags, reserved.
2. fixed32` Preexchanged token.

License

Apache-2.0