Document: draft-ietf-core-coap-tcp-tls-07
Reviewer: Yoshifumi Nishida
Reviewer: Yoshifumi Nishida
I've reviewed this document as part of TSV-ART's ongoing effort to review key IETF documents. These comments were written primarily for the transport area directors, but are copied to the document's authors for their information and to allow them to address any issues raised.When done at the time of IETF Last Call, the authors should consider this review together with any other last-call comments they receive. Please always CC tsv-art@xxxxxxxx if you reply to or forward this review.
Summary: This document is well-written. It is almost ready to be published as a PS draft once the following points are addressed.
1: It is not clear how the protocol reacts the errors from transport layers (e.g. connection failure).
The protocol will just inform apps of the events and the app will decide what to do or the protocol itself will do something?
2: There will be situations where the app layer is freezing while the transport layer is still working. Since transport layers cannot detect this type of failures, there should be some mechanisms for it somewhere in the protocol or in the app layer. The doc needs to address this point. For example, what will happen when a PONG message is not returned for a certain amount of time?
3: Since this draft defines new SZX value, I think the doc needs to update RFC7959. This point should be clarified more in the doc.
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Yoshi