100 lines
3.6 KiB
C
100 lines
3.6 KiB
C
/*
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* Copyright (c) 2013, Institute for Pervasive Computing, ETH Zurich
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*/
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/**
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* \file
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* Example resource
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* \author
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* Matthias Kovatsch <kovatsch@inf.ethz.ch>
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*/
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#include "contiki.h"
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#if PLATFORM_HAS_RADIO
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#include <string.h>
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#include "rest-engine.h"
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#include "net/netstack.h"
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static void res_get_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
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/* A simple getter example. Returns the reading of the rssi/lqi from radio sensor */
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RESOURCE(res_radio,
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"title=\"RADIO: ?p=rssi\";rt=\"RadioSensor\"",
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res_get_handler,
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NULL,
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NULL,
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NULL);
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static void
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res_get_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
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{
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size_t len = 0;
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const char *p = NULL;
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radio_value_t value;
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int8_t rssi = 0;
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int success = 0;
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unsigned int accept = -1;
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REST.get_header_accept(request, &accept);
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if((len = REST.get_query_variable(request, "p", &p))) {
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if(strncmp(p, "rssi", len) == 0) {
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if(NETSTACK_RADIO.get_value(RADIO_PARAM_RSSI, &value) ==
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RADIO_RESULT_OK) {
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success = 1;
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rssi = (int8_t)value;
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}
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}
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}
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if(success) {
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if(accept == -1 || accept == REST.type.TEXT_PLAIN) {
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REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
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snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "%d", rssi);
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REST.set_response_payload(response, (uint8_t *)buffer, strlen((char *)buffer));
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} else if(accept == REST.type.APPLICATION_JSON) {
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REST.set_header_content_type(response, REST.type.APPLICATION_JSON);
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snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "{'rssi':%d}", rssi);
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REST.set_response_payload(response, buffer, strlen((char *)buffer));
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} else {
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REST.set_response_status(response, REST.status.NOT_ACCEPTABLE);
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const char *msg = "Supporting content-types text/plain and application/json";
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REST.set_response_payload(response, msg, strlen(msg));
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}
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} else {
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REST.set_response_status(response, REST.status.BAD_REQUEST);
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}
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}
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#endif /* PLATFORM_HAS_RADIO */
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