One thing I particularly like about CoAP is the /.well-known URI support (http://tools.ietf.org/html/rfc7252#section-7 http://tools.ietf.org/html/rfc7252#sectio

One thing I particularly like about CoAP is the /.well-known URI support (http://tools.ietf.org/html/rfc7252#section-7 http://tools.ietf.org/html/rfc7252#section-7). It lets you implement services with easily discoverable data endpoints. E.g. IoT sensor devices can be made self-documenting in a lightweight manner.