In the Constrained RESTful Environments (CoRE) working group at the Internet Engineering Task Force (IETF) a Representational State Transfer (REST) architecture is being defined for constrained nodes and networks, e.g. Wireless Sensor Networks (WSN). The CoRE working group has already proposed a standard called Constrained Application Protocol (CoAP) which can easily be translated to HTTP to foster pervasive integration of constrained nodes and networks with the 'regular' web.