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/*
* Author: Henry Bruce <henry.bruce@intel.com>
* Copyright (c) 2016 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 <tinyb/BluetoothException.hpp>
#include <vector>
#include <iostream>
#include <iomanip>
#include <thread>
#include <signal.h>
using namespace tinyb;
const std::string BT_UUID_ESS = "0000181a-0000-1000-8000-00805f9b34fb";
const std::string BT_UUID_TEMPERATURE = "00002a6e-0000-1000-8000-00805f9b34fb";
static bool interrupted = false;
static void signal_handler(int signal_value)
{
interrupted = true;
}
static void add_signal_handler()
{
struct sigaction action;
action.sa_handler = signal_handler;
action.sa_flags = 0;
sigemptyset (&action.sa_mask);
sigaction (SIGINT, &action, NULL);
}
/** This program reads the temperature from a device running the Environmental Sensing Senvice.
*/
int main(int argc, char **argv)
{
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);
}
std::unique_ptr<BluetoothAdapter> adapter = manager->get_default_adapter();
BluetoothDevice *ess_device = NULL;
// Start the discovery of devices */
bool ret = manager->start_discovery();
if (!ret) {
std::cout << "Failed to start discovery" << std::endl;
return 1;
}
std::cout << "Discovering BLE devices";
int num_devices = 0;
bool no_new_devices = false;
std::vector<std::unique_ptr<BluetoothDevice>> list_devices;
while (ess_device == NULL && !no_new_devices) {
list_devices = manager->get_devices();
std::cout << "." << std::flush;
if (list_devices.size() > 0 && list_devices.size() == num_devices)
no_new_devices = true;
num_devices = list_devices.size();
// Look for active ESS device
for (auto it = list_devices.begin(); it != list_devices.end(); ++it) {
if ((*it)->get_rssi() != 0) {
auto list_uuids = (*it)->get_uuids();
for (auto uuit = list_uuids.begin(); uuit != list_uuids.end(); ++uuit) {
if (*(uuit) == BT_UUID_ESS) {
ess_device = (*it).release();
break;
}
}
}
}
if (ess_device == NULL)
std::this_thread::sleep_for(std::chrono::seconds(4));
}
ret = manager->stop_discovery();
std::cout << std::endl;
// Now try to connect
if (ess_device != NULL) {
std::cout << "Connecting to " << ess_device->get_name() << " with addr " << ess_device->get_address() << std::flush;
try {
if (ess_device->connect()) {
std::cout << ". Connected" << std::endl;
}
else
std::cout << ". Failed" << std::endl;
} catch (BluetoothException& e) {
std::cout << std::endl << e.what() << std::endl;
return 1;
}
} else {
std::cout << "ESS device not found." << std::endl;
delete ess_device;
return 1;
}
if (!ess_device->get_connected()) {
delete ess_device;
return 1;
}
std::cout << "Getting environmental service" << std::endl;
std::unique_ptr<BluetoothGattService> environmental_service = ess_device->find(const_cast<std::string*>(&BT_UUID_ESS));
std::cout << "Getting temperature characteristic" << std::endl;
BluetoothGattCharacteristic *temp_characteristic = environmental_service->find(const_cast<std::string*>(&BT_UUID_TEMPERATURE)).release();
if (temp_characteristic != NULL) {
std::cout << "Starting temperature readings" << std::endl;
bool bt_error = false;
/* Activate the temperature measurements by enabling notifications */
add_signal_handler();
while (!bt_error && !interrupted) {
/* Read temperature data and display it */
try {
std::vector<unsigned char> response = temp_characteristic->read_value();
unsigned int size = response.size();
if (size == 2) {
int16_t* data = reinterpret_cast<int16_t*>(response.data());
std::cout << "Raw data = " << std::hex << std::setfill('0') << std::setw(4) << *data << ". ";
uint16_t ambient_temp = (*data + 50) / 100;
std::cout << "Temperature = " << std::dec << ambient_temp << "C " << std::endl;
}
std::this_thread::sleep_for(std::chrono::seconds(1));
} catch (BluetoothException& e) {
std::cout << "Read_value failed. " << e.what() << std::endl;
bt_error = true;
}
}
delete temp_characteristic;
}
/* Disconnect from the device */
ess_device->disconnect();
delete ess_device;
return 0;
}
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