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A CoAP (RFC 7252) implementation in C

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I have some question about service obs notify; In my usage scenario: - in client; multi client obs servcie resource; - in service; add a resource that can be observed;...

Add in new event COAP_EVENT_XMIT_BLOCK_FAIL which gets triggered on detecting transmission failure of large body using BlockX. Track the last time a lg_xmit was sent, so it can be timed...

**Is your feature request related to a problem? Please describe.** Block1 and 2 option needs ACK for every block, which slows transmission **Describe the solution you'd like** As described here,...

examples/client.c: examples/coap-server.c: Add in Q-Block intelligence. include/coap2/block.h include/coap2/coap_block_internal.h include/coap2/coap_event.h Add in Q-Block references. Add in new functions coap_block_check_q_block1_xmit() coap_block_check_q_block2_xmit() coap_send_q_blocks() coap_send_q_block1() coap_send_q_block2() coap_block_drop_resp_q_block_xmit() coap_block_drop_resp_q_block2_crcv() include/coap2/coap_session.h: Add in new Congestion Control...

Track usage and timeout after COAP_MAX_TRANSMIT_WAIT seconds if not everything has been received. See inferred issue in #892.

## Environment - libcoap version (run ``git describe --tags`` to find it): v4.3.0-rc3-41-g25fe796 - Build System: [CMake] - Operating System: [Other ] - Operating System Version: [ ] - Hosted...

## Environment - libcoap version (run ``git describe --tags`` to find it): 4.3.0 // v4.3.0-rc3-41-g25fe796 - Build System: CMake - Operating System: [Windows|Linux|macOS|FreeBSD|Cygwin|Solaris|RIOT|Other (which?)] Linux - Operating System Version: [...

This PR updates libcoap to the latest version of Contiki: Contiki-NG. I tested some basic scenarios without DTLS. Three remaining issues I am aware of are: - ~~It is not...

## Environment - libcoap version: v4.3. something (not so sure, because is a precompiled lib but has the coap3 folder) - Build System: platformio - Operating System: Windows - Operating...

Set up coap_log_t as an enum, using syslog variable names prefixed by COAP_. Add function coap_dtls_log() for logging information from (D)TLS libraries. Update the log output to have a prefix...