RFC 7252 Tier 1 compliance: critical options, NSTART#36
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March 15, 2026 17:03
Server checks all packet options after parse, before handler dispatch. Critical (odd-numbered) options not in coapz.OptionKind or Config.recognized_options return 4.02 Bad Option. Both plain CoAP and DTLS paths covered. Response cached for CON dedup.
Client tracks peer_confirmed flag, set on first response via poll(), waitForResponse(), or routeObserve(). submit() returns NstartExceeded when unconfirmed and count_active >= nstart. Full pipelining resumes after first successful exchange.
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Summary
Config.recognized_optionsfor app-specific extensions.submit()andobserve().Test plan