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/*
* Author: Petre Eftime <petre.p.eftime@intel.com>
* Copyright (c) 2015 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <tinyb.hpp>
#include <vector>
#include <iostream>
#include <thread>
#include <atomic>
#include <csignal>
using namespace tinyb;
/** Converts a raw temperature read from the sensor to a Celsius value.
* @param[in] raw_temp The temperature read from the sensor (two bytes)
* @return The Celsius value of the temperature
*/
static float celsius_temp(uint16_t raw_temp)
{
const float SCALE_LSB = 0.03125;
return ((float)(raw_temp >> 2)) * SCALE_LSB;
}
std::atomic<bool> running(true);
void signal_handler(int signum)
{
if (signum == SIGINT) {
running = false;
}
}
/** This program reads the temperature from a
* TI Sensor Tag(http://www.ti.com/ww/en/wireless_connectivity/sensortag2015/?INTC=SensorTag&HQS=sensortag)
* Pass the MAC address of the sensor as the first parameter of the program.
*/
int main(int argc, char **argv)
{
if (argc < 2) {
std::cerr << "Run as: " << argv[0] << " <device_address>" << std::endl;
exit(1);
}
BluetoothManager *manager = nullptr;
try {
manager = BluetoothManager::get_bluetooth_manager();
} catch(const std::runtime_error& e) {
std::cerr << "Error while initializing libtinyb: " << e.what() << std::endl;
exit(1);
}
/* Start the discovery of devices */
bool ret = manager->start_discovery();
std::cout << "Started = " << (ret ? "true" : "false") << std::endl;
std::unique_ptr<BluetoothGattService> temperature_service;
std::string device_mac(argv[1]);
auto sensor_tag = manager->find<BluetoothDevice>(nullptr, &device_mac, nullptr, std::chrono::seconds(10));
if (sensor_tag == nullptr) {
std::cout << "Device not found" << std::endl;
return 1;
}
if (sensor_tag == nullptr) {
ret = manager->stop_discovery();
std::cerr << "SensorTag not found after 30 seconds, exiting" << std::endl;
return 1;
}
/* Connect to the device and get the list of services exposed by it */
sensor_tag->connect();
std::string service_uuid("f000aa00-0451-4000-b000-000000000000");
std::cout << "Waiting for service " << service_uuid << " to be discovered" << std::endl;
temperature_service = sensor_tag->find(&service_uuid);
/* Stop the discovery (the device was found or timeout was over) */
ret = manager->stop_discovery();
std::cout << "Stopped = " << (ret ? "true" : "false") << std::endl;
auto value_uuid = std::string("f000aa01-0451-4000-b000-000000000000");
auto temp_value = temperature_service->find(&value_uuid);
auto config_uuid = std::string("f000aa02-0451-4000-b000-000000000000");
auto temp_config = temperature_service->find(&config_uuid);
auto period_uuid = std::string("f000aa03-0451-4000-b000-000000000000");
auto temp_period = temperature_service->find(&period_uuid);
/* Activate the temperature measurements */
try {
std::vector<unsigned char> config_on {0x01};
temp_config->write_value(config_on);
std::signal(SIGINT, signal_handler);
} catch (std::exception &e) {
std::cout << "Error: " << e.what() << std::endl;
running = false;
}
while (running) {
/* Read temperature data and display it */
try {
std::vector<unsigned char> response = temp_value->read_value();
unsigned char *data;
unsigned int size = response.size();
if (size > 0) {
data = response.data();
std::cout << "Raw data=[";
for (unsigned i = 0; i < response.size(); i++)
std::cout << std::hex << static_cast<int>(data[i]) << ", ";
std::cout << "] ";
uint16_t ambient_temp, object_temp;
object_temp = data[0] | (data[1] << 8);
ambient_temp = data[2] | (data[3] << 8);
std::cout << "Ambient temp: " << celsius_temp(ambient_temp) << "C ";
std::cout << "Object temp: " << celsius_temp(object_temp) << "C ";
std::cout << std::endl;
}
std::this_thread::sleep_for(std::chrono::seconds(1));
} catch (std::exception &e) {
std::cout << "Error: " << e.what() << std::endl;
break;
}
}
/* Disconnect from the device */
try {
sensor_tag->disconnect();
} catch (std::exception &e) {
std::cout << "Error: " << e.what() << std::endl;
}
return 0;
}
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