The CoMatrix project enables the usage of the Matrix protocol (more precisely Matrix Client-Server API [0]) for constrained IoT devices via CoAP [1] and CBOR [2] in a constrained network (e.g. a 802.15.4/6LoWPAN network [3]).

The architecture of the Matrix protocol is based on HTTP/REST/JSON/TLS and is therefore not suitable for constrained devices. CoMatrix provides a gateway, which ports Matrix to CoAP/CBOR/(DTLS). This gateway communicates with constrained IoT devices on one side via CoAP+CBOR and translates to the Matrix protocol on the other side (i.e. HTTP+JSON). We also provide a CoMatrix client library (for RIOT-OS [4]) which provides a starting point to implement CoAP clients (for constrained devices) which are able to interact with Matrix homeservers via the gateway.