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File net.h is present in both libcoap and st-node repository. To avoid name conflict, file in libcoap is moved to subdirectory libcoap/ . All #include statements are changed accordingly.
This commit contains temporary fix for name conflict between st-node logging.h and libcoap debug.h. To be reverted when better solution is agreed upon.
Original libcoap functions operate on array of chars. New functions use mbuf_write.
This function uses mbuf supplied by net_receive to create a coap_pdu_t structure. It is based on LWIP port, but with significant change - LWIP stores coap_pdu_t structure inside mbuf (which seems to be pointless).
Function coap_read is modified to work with mbuf instead of array of chars. There is a possible problem with net_receive function - it is a blocking function, and it might cause errors with retransmissions.
This commit is an intermediate step towards replacement of libcoap log and debug system with st-node's.
Change necessary because of non-standard network handling of st-node.
Bug existed for messages with empty token.
Modify coap_new_context, coap_read and coap_send to work with new st-node network functions: - net_create - net_send_to - net_recv_from
Allows to create servers.
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