Basic CoAP library for arduino.
Communication based on XbeeRadio https://github.com/mksense/mac/tree/master/xbee/arduino

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* This branch is working as an implementation of the 8th version of the CoAP protocol.
* In this branch many things have changed:
   - resource class revamped
   - resources are now internal to coap object using vector type
   - but they can be added / updated / deleted externally
   - buffers are also internal, causing changes to many functions
   - callback function prototypes and usage
   - uri queries are now closer to the standar and allow multiple queries per request
   - apps are now easier to use coap library, with less code needed
* Not fully tested
   - uri queries are not tested
* Current TODO list:
   - Make retransmit and observe arrays of vector type
   - Reduce code size
   - Implement random factor for retransmit interval
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/********************************************************************************
 ** The Arduino-CoAP is free software: you can redistribute it and/or modify   **
 ** it under the terms of the GNU Lesser General Public License as             **
 ** published by the Free Software Foundation, either version 3 of the         **
 ** License, or (at your option) any later version.                            **
 **                                                                            **
 ** The Arduino-CoAP is distributed in the hope that it will be useful,        **
 ** but WITHOUT ANY WARRANTY; without even the implied warranty of             **
 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              **
 ** GNU Lesser General Public License for more details.                        **
 **                                                                            **
 ** You should have received a copy of the GNU Lesser General Public           **
 ** License along with the Arduino-CoAP.                                       **
 ** If not, see <http://www.gnu.org/licenses/>.                                **
 *******************************************************************************/


Current code has been tested and woking on Arduino UNO, and Arduino Pro Mini