What is this about?

  ☞   We have updated to the final CoAP standard^*) — and you should do so, too!

^*) RFC 7252 (previously known as coap-18) was approved on 2013-07-11 and published on 2014-06-26 (and is identical to coap-13...-17 except that the Accept Option is now critical and no longer repeatable)

CoAP crawler client

• Crawl CoAP Server on IP Address on port preferring NON:
• Or maybe crawl CoAP Server on URI preferring NON:

ETSI CoAP#4 test client

• Run specific ETSI CoAP plugtest 4 tests on Server on IP Address on port
• Or maybe run specific ETSI CoAP plugtest 4 tests on Server on URI

CoAP pcap interpreter

• Analyze a pcap (tcpdump or wireshark packet capture file)

Most recent packet encoding error seen

• 2026-04-09 15:35:52 UTC: ["I\xFBG\xE4\xFA\x90nn\x81[\xD6\xE6\xC8\xFE>n\x94\xCEz\x851j\x95\xAF\xFE>\x11\xA75\xE2\xFAs\x06L\x93\x9Ae \x9A;y\x87"] Bad delta/length nibble 15 at 14

Other CoAP test servers you may want to talk to:

• http://vs0.inf.ethz.ch (ETH Zürich)
• (add your server here)