tinyb/examples/notifications.cpp at master · intel-iot-devkit/tinyb · GitHub

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* Author: Petre Eftime <petre.p.eftime@intel.com>

* 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 <csignal>

#include <condition_variable>

using namespace tinyb;

std::condition_variable cv;

/** 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;

}

void data_callback(BluetoothGattCharacteristic &c, std::vector<unsigned char> &data, void *userdata)

{

/* Read temperature data and display it */

unsigned char *data_c;

unsigned int size = data.size();

if (size > 0) {

data_c = data.data();

std::cout << "Raw data=[";

for (unsigned i = 0; i < size; i++)

std::cout << std::hex << static_cast<int>(data_c[i]) << ", ";

std::cout << "] ";

uint16_t ambient_temp, object_temp;

object_temp = data_c[0] | (data_c[1] << 8);

ambient_temp = data_c[2] | (data_c[3] << 8);

std::cout << "Ambient temp: " << celsius_temp(ambient_temp) << "C ";

std::cout << "Object temp: " << celsius_temp(object_temp) << "C ";

std::cout << std::endl;

}

void signal_handler(int signum)

{

if (signum == SIGINT) {

cv.notify_all();

}

/** 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;

}

sensor_tag->enable_connected_notifications([] (BluetoothDevice &d, bool connected, void *usedata)

{ if (connected) std::cout << "Connected " << d.get_name() << std::endl; }, NULL);

if (sensor_tag != nullptr) {

/* 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);

} else {

ret = manager->stop_discovery();

std::cerr << "SensorTag not found after 30 seconds, exiting" << std::endl;

return 1;

}

/* 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 */

std::vector<unsigned char> config_on {0x01};

temp_config->write_value(config_on);

temp_period->write_value({100});

temp_value->enable_value_notifications(data_callback, nullptr);

std::mutex m;

std::unique_lock<std::mutex> lock(m);

std::signal(SIGINT, signal_handler);

cv.wait(lock);

/* Disconnect from the device */

if (sensor_tag != nullptr)

sensor_tag->disconnect();

}

tinyb/examples/notifications.cpp at master · intel-iot-devkit/tinyb · GitHub

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