LocationResource.h

00001 /**
00002  * @file    LocationResource.h
00003  * @brief   mbed CoAP Endpoint Location resource supporting CoAP GET
00004  * @author  Doug Anson
00005  * @version 1.0
00006  * @see
00007  *
00008  * Copyright (c) 2014
00009  *
00010  * Licensed under the Apache License, Version 2.0 (the "License");
00011  * you may not use this file except in compliance with the License.
00012  * You may obtain a copy of the License at
00013  *
00014  *     http://www.apache.org/licenses/LICENSE-2.0
00015  *
00016  * Unless required by applicable law or agreed to in writing, software
00017  * distributed under the License is distributed on an "AS IS" BASIS,
00018  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00019  * See the License for the specific language governing permissions and
00020  * limitations under the License.
00021  */
00022 
00023 #ifndef __LOCATION_RESOURCE_H__
00024 #define __LOCATION_RESOURCE_H__
00025 
00026 // Base class
00027 #include "DynamicResource.h"
00028 
00029 // main.cpp can enable/disable the experimental location source 
00030 #if ENABLE_BLE_LOCATION
00031     // our BLE Location source
00032     #include "BLELocation.h"
00033     extern RawSerial pc;               // main.cpp
00034     BLELocation _ble_location(&pc);    // BLE Location from the UART Proxy application
00035 #endif
00036 
00037 // We have a static location by default - Moscone West - 37.783879,-122.4012538, altitude 30m msl
00038 #define DEF_LATITUDE          37.783879
00039 #define DEF_LONGITUDE        -122.4012538
00040 #define DEF_ALTITUDE          30.0
00041 #define DEF_SPEED             0.0
00042 
00043 // Maximum Location JSON Length : {"latitude":XXX.YYYYYY, "longitude":XXX.YYYYYY, "msl":XXXXXX, "speed":XXXXXX}
00044 #define LOCATION_JSON_LENGTH  256
00045 char __location_json[LOCATION_JSON_LENGTH+1];
00046 
00047 /** LocationResource class
00048  */
00049 class LocationResource : public DynamicResource
00050 {
00051 public:
00052     /**
00053     Default constructor
00054     @param logger input logger instance for this resource
00055     @param name input the Location resource name
00056     @param observable input the resource is Observable (default: FALSE)
00057     */
00058     LocationResource(const Logger *logger,const char *name,const bool observable = false) : DynamicResource(logger,name,"Location",SN_GRS_GET_ALLOWED,observable) {
00059         memset(__location_json,0,LOCATION_JSON_LENGTH+1);
00060 #if ENABLE_BLE_LOCATION 
00061         _ble_location.setDefault(DEF_LATITUDE,DEF_LONGITUDE,DEF_ALTITUDE,DEF_SPEED);
00062 #endif
00063     }
00064 
00065     /**
00066     Get the value of the Location sensor
00067     @returns string containing the location value
00068     */
00069     virtual string get() {
00070         //_ble_location.updateLocation();
00071         memset(__location_json,0,LOCATION_JSON_LENGTH);
00072 #if ENABLE_BLE_LOCATION
00073         sprintf(__location_json,"{\"latitude\":%s,\"longitude\":%s,\"msl\":%s,\"speed\":%s,\"src\":\"proxy\"}",
00074                     _ble_location.getLatitude(),
00075                     _ble_location.getLongitude(),
00076                     _ble_location.getMSLAltitude(),    // in meters
00077                     _ble_location.getSpeed());         // in meters/second
00078 #else
00079         sprintf(__location_json,"{\"latitude\":%.6f,\"longitude\":%.6f,\"msl\":%.1f,\"speed\":%.1f,\"src\":\"static\"}",
00080                     DEF_LATITUDE,
00081                     DEF_LONGITUDE,
00082                     DEF_ALTITUDE,       // in meters
00083                     DEF_SPEED);         // in meters/second
00084 #endif
00085         return string(__location_json);
00086     }
00087 };
00088 
00089 #endif // __LOCATION_RESOURCE_H__