Document return value can be 0 for both being valid and returning on error.
Same is true for coap_encode_var_safe().
[Error should assert() by default]
doc/module_api_wrap.h: New
Used to split modules into Application and Internal only.
include/coap/*.h:
Module (@defgroup) description put into group application_api or internal_api
as appropriate.
Add in @file information if missing.
src/*.c
Add in @file information.
This change adds 'SPDX-License-Identifier: BSD-2-Clause' [1] to
the source code files that originate in the libcoap project.
Note that not all files are tagged because they are pulled in
from other sources and thus may fall under a different license.
More information about these is contained in the LICENSE file.
[1] https://spdx.org/licenses/BSD-2-Clause.html
Jon Shallow