Tools are becoming available for implementing IoT systems based on IETF standards.
Access CoAP nodes via HTTP, analyze pcaps (tcpdump/wireshark packet capture files) and run the ETSI interoperability tests against your server on this simple interactive website.
Additional resources are available at vs0.inf.ethz.ch including DTLS support.
A protocol dissector for CoAP has been part of Wireshark for quite some time, supporting the development of CoAP. The final CoAP protocol is supported by Wireshark 1.12, the stable version of Wireshark.
A number of interoperability tests have been defined by the ETSI plugtest organization. Californium contains support for this test suite. Access tester implementations via coap.me and read more details at:
ETSI is also periodically running interoperability testing events (“plugtests”). A next date for one has not yet been set; to keep up to date send mail to the ETSI plugtests people.
Carsten Bormann occasionally writes about 6LoWPAN and the Internet of Things.
Zach Shelby has made available a CoAP overview and tutorial. Slides here; watch at: