text: /*
  * Copyright (c) 2015 NXP B.V.
  * 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 NXP B.V. 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 NXP B.V. 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 NXP B.V. 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.
  *
  * Author: Theo van Daele <theo.van.daele@nxp.com>
  *
  */
  #include "contiki.h"
  #include "contiki-lib.h"
  #include "contiki-net.h"
  #include "net/ip/uip.h"
  #include "net/ipv6/uip-ds6.h"
  #include "net/rpl/rpl.h"
  #include "simple-udp.h"
  #include "net/mac/tsch/tsch.h"
  #include "net/mac/tsch/tsch-schedule.h"
  #include "net/netstack.h"
  #include "dev/slip.h"
  #include "rest-engine.h"
  #include "rpl-tools.h"
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <ctype.h>
  
  #define DEBUG DEBUG_NONE
  #include "net/ip/uip-debug.h"
  
  static uip_ipaddr_t prefix;
  static uint8_t prefix_set;
  
  static void get_rssi_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
  static void get_last_rssi_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
  
  static char content[REST_MAX_CHUNK_SIZE];
  static int content_len = 0;
  
  #define CONTENT_PRINTF(...) { if(content_len < sizeof(content)) content_len += snprintf(content+content_len, sizeof(content)-content_len, __VA_ARGS__); }
  
  PROCESS(border_router_process, "Border router process");
  AUTOSTART_PROCESSES(&border_router_process);
  
  RESOURCE(resource_get_rssi, 
           "title=\"Get RSSI\"",
           get_rssi_handler,
           NULL,
           NULL,
           NULL);
  static void
  get_rssi_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
  {
    int rssi_level;
    unsigned int accept = -1;
    REST.get_header_accept(request, &accept);
    if(accept == -1 || accept == REST.type.TEXT_PLAIN) {
      content_len = 0;
      NETSTACK_RADIO.get_value(RADIO_PARAM_RSSI, &rssi_level);
      CONTENT_PRINTF("%d", rssi_level);
      REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
      REST.set_response_payload(response, (uint8_t *)content, content_len);
    }
  }
  
  RESOURCE(resource_get_last_rssi, 
           "title=\"Get last RSSI\"",
           get_last_rssi_handler,
           NULL,
           NULL,
           NULL);
  static void
  get_last_rssi_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
  {
    int last_rssi_level;
    unsigned int accept = -1;
    REST.get_header_accept(request, &accept);
    if(accept == -1 || accept == REST.type.TEXT_PLAIN) {
      content_len = 0;
      NETSTACK_RADIO.get_value(RADIO_PARAM_LAST_RSSI, &last_rssi_level);
      CONTENT_PRINTF("%d", last_rssi_level);
      REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
      REST.set_response_payload(response, (uint8_t *)content, content_len);
    }
  }
  
  /*---------------------------------------------------------------------------*/
  void
  request_prefix(void)
  {
    /* mess up uip_buf with a dirty request... */
    uip_buf[0] = '?';
    uip_buf[1] = 'P';
    uip_len = 2;
    slip_send();
    uip_len = 0;
  }
  /*---------------------------------------------------------------------------*/
  void
  set_prefix_64(uip_ipaddr_t *prefix_64)
  {
    memcpy(&prefix, prefix_64, 16);
    prefix_set = 1;
  }
  /*---------------------------------------------------------------------------*/
  PROCESS_THREAD(border_router_process, ev, data)
  {
    static struct etimer et;
  
    PROCESS_BEGIN();
  
  /* While waiting for the prefix to be sent through the SLIP connection, the future
   * border router can join an existing DAG as a parent or child, or acquire a default
   * router that will later take precedence over the SLIP fallback interface.
   * Prevent that by turning the radio off until we are initialized as a DAG root.
   */
    prefix_set = 0;
  
    PROCESS_PAUSE();
  
    PRINTF("RPL-Border router started\n");
  
    /* Request prefix until it has been received */
    while(!prefix_set) {
      etimer_set(&et, CLOCK_SECOND);
      request_prefix();
      PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
      PRINTF("Waiting for prefix\n");
    }
  
    PRINTF("Obtained prefix: ");
    uip_debug_ipaddr_print(&prefix);
    PRINTF("\n");
  
    rpl_tools_init(&prefix);
  
    rest_init_engine();
    rest_activate_resource(&resource_get_rssi, "Get-RSSI");
    rest_activate_resource(&resource_get_last_rssi, "Get-Last-RSSI");
  
  
    PROCESS_END();
  }
  /*---------------------------------------------------------------------------*/
  