Make coap_pdu-t independent of the header style.
Use C99 sized types when applicable.
Use transaction ids in host byte order in the library.
Make coap_pdu_t payload storage grow on demand.
Add parsing and encoding of PDUs with UDP or TCP style headers.
Adapt examples and unit tests to the new PDU format.
The message id in the CoAP header is used for reliability when
transferring a CoAP PDU over a non-reliable transport protocol
such as UDP. For message de-duplication, it is useful to have
a monotonously increasing number space within a session. Therefore,
the context-global value has been moved to coap_session_t.
The function coap_new_message_id() now takes a coap_session_t
object as its argument.
Compact coap_address_t.
Use coap_queue_t for all queues.
OpenSSL warning for close alert should be info level.
Fix OpenSSL log level not working.
Use the application defined MTU in OpenSSL.
coap_log() optimization to avoid generating the log message text before testing the log level.
coap_can_exit() should check the new retransmit queues.
Fix retransmit time sometimes not correctly computed relative to sendqueue_basetime.
Add coap_write() API call for applications with their own main loop.
jcmichelou