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

• 2026-02-10 06:01:40 UTC: ["PUT /sensor/data\n\xD0\xA2\xD0\xB5\xD0\xBC\xD0\xBF\xD0\xB5\xD1\x80\xD0\xB0\xD1\x82\xD1\x83\xD1\x80\xD0\xB0 = 40.00 \xC2\xB0C"] Bad delta/length nibble 15 at 5

Other CoAP test servers you may want to talk to:

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