osd-contiki/examples/osd/pwm-example/er-example-server.c

/*
 * Copyright (C) 2011, Matthias Kovatsch and other contributors.
 * 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
 *      Erbium (Er) PWM REST Engine example (with CoAP-specific code)
 * \author
 *      Matthias Kovatsch <kovatsch@inf.ethz.ch>
 *      Ralf Schlatterbeck <rsc@runtux.com>
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "contiki.h"
#include "contiki-net.h"
#include "jsonparse.h"

#include "erbium.h"
#include "er-coap-13.h"

#include "led_pwm.h"

#define DEBUG 1
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif

/******************************************************************************/

/*
 * Resources are defined by the RESOURCE macro.
 * Signature: resource name, the RESTful methods it handles, and its URI
 * path (omitting the leading slash).
 */
RESOURCE(info, METHOD_GET, "info", "title=\"Info\";rt=\"text\"");

/*
 * A handler function named [resource name]_handler must be implemented
 * for each RESOURCE.  A buffer for the response payload is provided
 * through the buffer pointer. Simple resources can ignore
 * preferred_size and offset, but must respect the REST_MAX_CHUNK_SIZE
 * limit for the buffer.  If a smaller block size is requested for CoAP,
 * the REST framework automatically splits the data.
 */
void
info_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
  char message[100];
  int index = 0;
  int length = 0; /*           |<-------->| */

  /*
   * Some data that has the length up to REST_MAX_CHUNK_SIZE. For more,
   * see the chunk resource.
   */
  // jSON Format
  index += sprintf(message + index,"{\n \"Version\" : \"V1.0pre1\",\n");
  index += sprintf(message + index," \"name\" : \"PWM\"\n");
  index += sprintf(message + index,"}\n");

  length = strlen(message);
  memcpy(buffer, message,length );

  REST.set_header_content_type(response, REST.type.APPLICATION_JSON);
  REST.set_response_payload(response, buffer, length);
}

void 
hw_init()
{
    led_pwm_init ();
}

PROCESS(rest_server_example, "Erbium Example Server");

AUTOSTART_PROCESSES(&rest_server_example);

PROCESS_THREAD(rest_server_example, ev, data)
{
  PROCESS_BEGIN();
  PRINTF("Starting Erbium Example Server\n");

#ifdef RF_CHANNEL
  PRINTF("RF channel: %u\n", RF_CHANNEL);
#endif
#ifdef IEEE802154_PANID
  PRINTF("PAN ID: 0x%04X\n", IEEE802154_PANID);
#endif

  PRINTF("uIP buffer: %u\n", UIP_BUFSIZE);
  PRINTF("LL header: %u\n", UIP_LLH_LEN);
  PRINTF("IP+UDP header: %u\n", UIP_IPUDPH_LEN);
  PRINTF("REST max chunk: %u\n", REST_MAX_CHUNK_SIZE);

/* if static routes are used rather than RPL */
#if !UIP_CONF_IPV6_RPL \
 && !defined (CONTIKI_TARGET_MINIMAL_NET) \
 && !defined (CONTIKI_TARGET_NATIVE)
  set_global_address();
  configure_routing();
#endif

  /* Initialize the OSD Hardware. */
  hw_init();
  /* Initialize the REST engine. */
  rest_init_engine();

  /* Activate the application-specific resources. */
  rest_activate_resource(&resource_info);
  rest_activate_resource(&resource_led_pwm);

  /* Define application-specific events here. */
  while(1) {
    PROCESS_WAIT_EVENT();
  } /* while (1) */

  PROCESS_END();
}