A minimal CoAP (RFC 7252) server built on coap-lite for message encoding
and a tokio UdpSocket for transport. The socket, read loop and routing are
kept in src/main.rs rather than behind a framework.
Routes:
GET /hello[?name=X] -> 2.05 "Hello, X!" (defaults to World)
POST /hello -> 2.01, name from a raw text or JSON body
GET /health -> 2.05 status + uptime
Unknown paths return 4.04, known paths with the wrong method 4.05.
Includes a CLI client (src/bin/client.rs) for smoke tests and unit tests
covering the greeting, payload parsing and query decoding. Verified against
node-coap as an independent implementation to confirm wire compatibility.
The earlier Node.js prototype is kept under nodejs/ for reference.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
