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Wojtek's changes#2

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franc0is wants to merge 74 commits intofranc0is:fbofrom
sastrion:fbo-merge
Open

Wojtek's changes#2
franc0is wants to merge 74 commits intofranc0is:fbofrom
sastrion:fbo-merge

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mwasilak added 30 commits May 8, 2014 21:11
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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