Add SHT11 CoAP Resource and Activate Sensors for several CoAP Resources.

examples/er-rest-example/er-example-server.c

@@ -76,8 +76,23 @@ extern resource_t
 extern resource_t res_leds, res_toggle;
 #endif
 #if PLATFORM_HAS_LIGHT
+#include "dev/light-sensor.h"
 extern resource_t res_light;
 #endif
+/*
+#if PLATFORM_HAS_BATTERY
+#include "dev/battery-sensor.h"
+extern resource_t res_battery;
+#endif
+#if PLATFORM_HAS_RADIO
+#include "dev/radio-sensor.h"
+extern resource_t res_radio;
+#endif
+#if PLATFORM_HAS_SHT11
+#include "dev/sht11/sht11-sensor.h"
+extern resource_t res_sht11;
+#endif
+*/
 
 PROCESS(er_example_server, "Erbium Example Server");
 AUTOSTART_PROCESSES(&er_example_server);
@@ -123,8 +138,23 @@ PROCESS_THREAD(er_example_server, ev, data)
   rest_activate_resource(&res_toggle, "actuators/toggle");
 #endif
 #if PLATFORM_HAS_LIGHT
-/*  rest_activate_resource(&res_light, "sensors/light"); */
+  rest_activate_resource(&res_light, "sensors/light"); 
+  SENSORS_ACTIVATE(light_sensor);  
 #endif
+/*
+#if PLATFORM_HAS_BATTERY
+  rest_activate_resource(&res_battery, "sensors/battery");  
+  SENSORS_ACTIVATE(battery_sensor);  
+#endif
+#if PLATFORM_HAS_RADIO
+  rest_activate_resource(&res_radio, "sensors/radio");  
+  SENSORS_ACTIVATE(radio_sensor);  
+#endif
+#if PLATFORM_HAS_SHT11
+  rest_activate_resource(&res_sht11, "sensors/sht11");  
+  SENSORS_ACTIVATE(sht11_sensor);  
+#endif
+*/
 
   /* Define application-specific events here. */
   while(1) {

examples/er-rest-example/resources/res-battery.c

@@ -47,7 +47,7 @@
 static void res_get_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
 
 /* A simple getter example. Returns the reading from light sensor with a simple etag */
-RESOURCE(battery,
+RESOURCE(res_battery,
          "title=\"Battery status\";rt=\"Battery\"",
          res_get_handler,
          NULL,

examples/er-rest-example/resources/res-sht11.c

@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2014, Nimbus Centre for Embedded Systems Research, Cork Institute 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 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
+ *      SHT11 Sensor Resource
+ *
+ *      This is a simple GET resource that returns the temperature in Celsius
+ *      and the humidity reading from the SHT11.
+ * \author
+ *      Pablo Corbalan <paul.corbalan@gmail.com>
+ */
+
+#include "contiki.h"
+
+#if PLATFORM_HAS_SHT11
+
+#include <string.h>
+#include "rest-engine.h"
+#include "dev/sht11/sht11-sensor.h"
+
+static void res_get_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset);
+
+/* Get Method Example. Returns the reading from temperature and humidity sensors. */
+RESOURCE(res_sht11,
+         "title=\"Temperature and Humidity\";rt=\"Sht11\"",
+         res_get_handler,
+         NULL,
+         NULL,
+         NULL);
+
+static void
+res_get_handler(void *request, void *response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
+{
+  /* Temperature in Celsius (t in 14 bits resolution at 3 Volts)
+   * T = -39.60 + 0.01*t
+   */
+  uint16_t temperature = ((sht11_sensor.value(SHT11_SENSOR_TEMP) / 10) - 396) / 10;
+  /* Relative Humidity in percent (h in 12 bits resolution)
+   * RH = -4 + 0.0405*h - 2.8e-6*(h*h)
+   */
+  uint16_t rh = sht11_sensor.value(SHT11_SENSOR_HUMIDITY);
+
+  unsigned int accept = -1;
+  REST.get_header_accept(request, &accept);
+
+  if(accept == -1 || accept == REST.type.TEXT_PLAIN) {
+    REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
+    snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "%u;%u", temperature, rh);
+
+    REST.set_response_payload(response, (uint8_t *)buffer, strlen((char *)buffer));
+  } else if(accept == REST.type.APPLICATION_XML) {
+    REST.set_header_content_type(response, REST.type.APPLICATION_XML);
+    snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "<Temperature =\"%u\" Humidity=\"%u\"/>", temperature, rh);
+
+    REST.set_response_payload(response, buffer, strlen((char *)buffer));
+  } else if(accept == REST.type.APPLICATION_JSON) {
+    REST.set_header_content_type(response, REST.type.APPLICATION_JSON);
+    snprintf((char *)buffer, REST_MAX_CHUNK_SIZE, "{'Sht11':{'Temperature':%u,'Humidity':%u}}", temperature, rh);
+
+    REST.set_response_payload(response, buffer, strlen((char *)buffer));
+  } else {
+    REST.set_response_status(response, REST.status.NOT_ACCEPTABLE);
+    const char *msg = "Supporting content-types text/plain, application/xml, and application/json";
+    REST.set_response_payload(response, msg, strlen(msg));
+  }
+}
+#endif /* PLATFORM_HAS_SHT11 */