As some unit tests are currently broken, --disable-tests now is
the default. You can switch on unit tests by passing --enable-tests
to configure.

With option -H, no valid host certificate is required for the AM.
This option is intended only for testing.

With commit 38d66cc6, num_segments may be uninitialized if no query is
written. This change ensures that num_segments is always initialized
to 0.

When called with COAP_OPTION_URI_QUERY, set_uri_options() creates
Uri-Query options only for non-empty query strings.

Hugo Damer has pointed out that the assertion in make_ticket_request()
fails when buf is not cleared before calling coap_get_resource_uri().

Fix commit 3459435c that failed to include libdcaf.h in
libdcaf_include_HEADERS.

Received CoAP responses may contain SAM information messages in case
the sender is not authorized. Therefore, a response is checked for the
Content-Format DCAF_MEDIATYPE_DCAF_CBOR. If no Content-Format is set,
the response is treated as non-DCAF message.

This reverts commit e15d960f.

Commit 3a3d8331 has used a wrong package name for libyaml-cpp.

The AM configuration file now is parsed asYAML document, using
yaml-cpp [1]. The following paths are now searched in order if
option '-C' is not given on the command line:

1. $HOME/.amrc
2. $HOME/.local/dcaf/amrc
3. /etc/amrc

[1] https://github.com/jbeder/yaml-cpp

* Improve reporting which library has been detected.
* Call PKG_CHECK_MODULES where a .pc file is known to exist.

The PSK callback for a CoAP server now is setup with
coap_context_set_psk2().

PR 613 [1] changed the name of the message id field in coap_pdu_t
to mid and its type to coap_mid_t. This change updates their use
in DCAF.

[1] https://github.com/obgm/libcoap/pull/613

From version 4.3, libcoap has an enum coap_response_code with
symbolic response code names. This change defines the used symbols
for libcoap versions prior to 4.3.

This change reflects the API changes that will be introduced with
libcoap version 4.3.0 and that are already availabe in libcoap's
develop branch.

The function coap_check_notify() has become obsolete and was removed
from libcoap's external API in commit da186437.

Use coap_run_once() on for older versions of libcoap.

As version 4.2.1 of libcoap has the addr_info field in coap_session_t it
is being used here.

Although raw_identity is not used for libcoap prior version 4.3, it
must be defined as it is set in the PSK decode logic.

The dcaf_ticket_request_t structure now contains a flags parameter to
convey control options contained in requests. This field is currently
used only for ACE implementations.