As the libcoap sources have been moved to the sub-directory src it must be added to the vpath. The header files now reside in include/coap, so we need an additional -I compiler flag for this. The root path for libcoap is derived from the variable APPDS which is set by $(CONTIKI)/Makefile.include. This is a bit fragile but the best we have...
libcoap: A C implementation of IETF Constrained Application Protocol (RFC 7252)
Copyright (C) 2010--2015 by Olaf Bergmann bergmann@tzi.org
ABOUT LIBCOAP
libcoap is a C implementation of a lightweight application-protocol for devices that are constrained their resources such as computing power, RF range, memory, bandwith, or network packet sizes. This protocol, CoAP, is standardized by the IETF as RFC 7252. For further information related to CoAP, see http://coap.technology.
PACKAGE CONTENTS
This directory contains a protocol parser and basic networking functions for platform with support for malloc() and BSD-style sockets. The examples directory contains a client and a server to demonstrate the use of this library.
LICENSE INFORMATION
This library is published as open-source software without any warranty of any kind. Use is permitted under the terms of the GNU General Public License (GPL), Version 2 or higher, OR the revised BSD license. Please refer to LICENSE.GPL oder LICENSE.BSD for further details.