text: /*
   * Copyright (c) 2017, RISE SICS.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. Neither the name of the Institute nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * This file is part of the Contiki operating system.
   *
   */
  
  /**
   * \file
   *         NullNet, a minimal network layer.
   * \author
   *         Simon Duquennoy <simon.duquennoy@ri.se>
   *
   */
  
  /**
   * \ingroup net-layer
   * \addtogroup nullnet
  A network layer that does nothing. Useful for lower-layer testing and
  for non-IPv6 scenarios.
   * @{
   */
  
  #ifndef NULLNET_H_
  #define NULLNET_H_
  
  #include "contiki.h"
  #include "net/linkaddr.h"
  
  /**
   * Buffer used by the output function
  */
  extern uint8_t *nullnet_buf;
  extern uint16_t nullnet_len;
  
  /**
   * Function prototype for NullNet input callback
  */
  typedef void (* nullnet_input_callback)(const void *data, uint16_t len,
    const linkaddr_t *src, const linkaddr_t *dest);
  
  /**
   * Set input callback for NullNet
   *
   * \param callback The input callback
  */
  void nullnet_set_input_callback(nullnet_input_callback callback);
  
  #endif /* NULLNET_H_ */
  /** @} */
  