RFC 7252, "The Constrained Application Protocol (CoAP)", June 2014

Errata ID: 4949
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Klaus Hartke
Date Reported: 2017-02-22
Verifier Name: Francesca Palombini
Date Verified: 2023-01-18

Section 5.10.7 says:

If any
of these reserved option numbers occurs in addition to Location-Path
and/or Location-Query and are not supported, then a 4.02 (Bad Option)
error MUST be returned.

It should say:

If any
of these reserved option numbers occurs in addition to Location-Path
and/or Location-Query and are not supported, then the response MUST
be rejected (Sections 4.2 and 4.3).

Notes:

The Location-* options are used in responses. A client cannot return a 4.02 (Bad Option) response in reply to a response. The correct behavior is to reject the response.

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