convert normal Matrix HTTPS+JSON traffic into an ultra-low-bandwidth CoAP+CBOR+Flate+Noise+UDP network transport
Brendan Abolivier and the Matrix.org Team
coap-proxy is a proof of concept experiment for converting normal Matrix HTTPS+JSON traffic into an ultra-low-bandwidth CoAP+CBOR+Flate+Noise+UDP network transport. The resulting transport typically uses 35x-70x less bandwidth than HTTPS+JSON, and attempts to fit typical Matrix transactions into a single roundtrip on a 100bps network link.
coap-proxy depends heavily on our experimental fork of go-ocf/go-coap, which implements Noise-based encryption, compression hooks and retry semantics.
More details on the transport can be found in our "Breaking the 100 bits per second barrier with Matrix" FOSDEM 2019 talk: https://matrix.org/blog/2019/03/12/breaking-the-100bps-barrier-with-matrix-meshsim-coap-proxy/
The typical way to run coap-proxy is via docker using the meshsim network simulator, which fires up docker containers in a simulated bad network environment containing both synapse and coap-proxy configured such that coap-proxy intercepts both client-server and server-server traffic.