/*
 * Copyright (c) 2017, Graz University of Technology
 * 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 copyright holder 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 COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDER 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.
 */

/**
 * \file
 *    A simple IPv6-over-BLE UDP-client.
 *
 * \author
 *    Michael Spoerk <michael.spoerk@tugraz.at>
 */
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "contiki-lib.h"
#include "contiki-net.h"

#include "net/ipv6/uip-icmp6.h"

#include <string.h>
#include <stdio.h>

#include "os/dev/ble-hal.h"
/*---------------------------------------------------------------------------*/
#define SERVER_IP               "::"
#define CLIENT_PORT           61617
#define SERVER_PORT           61616

#define PING_TIMEOUT              (CLOCK_SECOND / 4)
#define CLIENT_SEND_INTERVAL      (CLOCK_SECOND * 1)

#define UDP_LEN_MAX           255
/*---------------------------------------------------------------------------*/
static uip_ipaddr_t server_addr;
static struct uip_icmp6_echo_reply_notification icmp_notification;
static uint8_t echo_received;
static struct uip_udp_conn *conn;

static struct etimer timer;
static char buf[UDP_LEN_MAX];
static uint16_t packet_counter;
/*---------------------------------------------------------------------------*/
PROCESS(ipv6_ble_client_process, "IPv6 over BLE - client process");
AUTOSTART_PROCESSES(&ipv6_ble_client_process);
/*---------------------------------------------------------------------------*/
void
icmp_reply_handler(uip_ipaddr_t *source, uint8_t ttl,
                   uint8_t *data, uint16_t datalen)
{
  if(uip_ip6addr_cmp(source, &server_addr)) {
    printf("echo response received\n");
    echo_received = 1;
  }
}
/*---------------------------------------------------------------------------*/
static void
tcpip_handler(void)
{
  char data[UDP_LEN_MAX];
  if(uip_newdata()) {
    strncpy(data, uip_appdata, uip_datalen());
    data[uip_datalen()] = '\0';
    printf("rec. message: <%s>\n", data);
  }
}
/*---------------------------------------------------------------------------*/
static void
timeout_handler(void)
{
  sprintf(buf, "Hello server %04u!", packet_counter);
  printf("send message: <%s>\n", buf);
  uip_udp_packet_send(conn, buf, strlen(buf));
  packet_counter++;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(ipv6_ble_client_process, ev, data)
{
  PROCESS_BEGIN();
  printf("IPv6-over-BLE client started\n");

  uiplib_ipaddrconv(SERVER_IP, &server_addr);
  uip_icmp6_echo_reply_callback_add(&icmp_notification, icmp_reply_handler);

  printf("pinging the IPv6-over-BLE server\n");

  do {
    etimer_set(&timer, PING_TIMEOUT);
    PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&timer));
    uip_icmp6_send(&server_addr, ICMP6_ECHO_REQUEST, 0, 20);
  } while(!echo_received);

  conn = udp_new(&server_addr, UIP_HTONS(SERVER_PORT), NULL);
  udp_bind(conn, UIP_HTONS(CLIENT_PORT));

  etimer_set(&timer, CLIENT_SEND_INTERVAL);

  while(1) {
    PROCESS_YIELD();
    if((ev == PROCESS_EVENT_TIMER) && (data == &timer)) {
      timeout_handler();
      etimer_set(&timer, CLIENT_SEND_INTERVAL);
    } else if(ev == tcpip_event) {
      tcpip_handler();
    }
  }

  PROCESS_END();
}
/*---------------------------------------------------------------------------*/