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chrysn
e32a0f3497
the coap_add_option_later works like coap_add_option, but does not take data. instead, it allocates the option empty, and returns an address the application has to fill with data later. this is especially useful for the etag and block options; the application can write out its variable data, generate a checksum while writing, and fill the etag when the data is already written to the pdu. with the block options, the more flag can be set at the last moment.
libcoap: A C implementation of IETF Core Application protocol Copyright (C) 2010--2013 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 developed in the IETF working group "Constrained RESTful Environments (core)", see <http://6lowapp.net>. 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.