Question about error handling for in-session requests when TerminationPolicy = 0 after FW update

[yqt2000]

Hi,

According to the SPDM 1.4.1 specification, if TerminationPolicy is set to 0, the Responder must terminate the session when a firmware/measurement update takes effect.
My question is regarding the expected behavior if the Requester subsequently sends an in-session request. Which of the following should the Responder do?

1. Silently discard the request?
2. Return RequestSessionTerminated (0x46)? (Note: The error code table specifically mentions this is used when TerminationPolicy is set to 1)
3. Return RequestResynch (0x43)?

Any clarification on the standard expected behavior would be appreciated!

[steven-bellock]

It can do all three of those, although I would think most Responders would opt for RequestResynch after a firmware update.