'unknown' is updated by coap_option_check_critical if there is a critical
option, but as it is not passed in by reference, any caller does not see
any change to 'unknown'.
Pass in 'unknown' by reference.
Issue got missed in change e2e7830
The original requesting PDU is now kept with the Observe request along with
its data and used whenever an additional response needs to be generated.
Abstracted information from the requesting PDU is no longer kept in
coap_subscription_t as it can be obtained from the kept PDU.
No longer any need to check for request PDU in request handlers as it is now
always provided.
coap_resource_notify_observers() now ignores the query parameter, as a
cache_key is now used for request matching.
As the uthash macros have been moved to coap_resource_internal.h by
PR #582 [1], see commit da18643, the convenience macros and uthash.h
inclusion can be removed from resource.h
[1] https://github.com/obgm/libcoap/pull/582
Jon Shallow