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import java.util.concurrent.locks.*;
import org.direct_bt.BTDevice;
import org.direct_bt.BTException;
import org.direct_bt.BTFactory;
import org.direct_bt.BTGattChar;
import org.direct_bt.BTGattService;
import org.direct_bt.BTManager;
import org.direct_bt.HCIStatusCode;
import java.lang.reflect.InvocationTargetException;
import java.util.concurrent.TimeUnit;
public class AsyncTinyB {
// private static final float SCALE_LSB = 0.03125f;
static boolean running = true;
static void printDevice(final BTDevice device) {
System.out.print("Address = " + device.getAddressAndType());
System.out.print(" Name = " + device.getName());
System.out.print(" Connected = " + device.getConnected());
System.out.println();
}
static float convertCelsius(final int raw) {
return raw / 128f;
}
/*
* This program connects to a TI SensorTag 2.0 and reads the temperature characteristic exposed by the device over
* Bluetooth Low Energy. The parameter provided to the program should be the MAC address of the device.
*
* A wiki describing the sensor is found here: http://processors.wiki.ti.com/index.php/CC2650_SensorTag_User's_Guide
*
* The API used in this example is based on TinyB v0.3, which only supports polling, but v0.4 will introduce a
* simplied API for discovering devices and services.
*/
public static void main(final String[] args) throws InterruptedException {
if (args.length < 1) {
System.err.println("Run with <device_address> argument");
System.exit(-1);
}
/*
* To start looking of the device, we first must initialize the TinyB library. The way of interacting with the
* library is through the BluetoothManager. There can be only one BluetoothManager at one time, and the
* reference to it is obtained through the getBluetoothManager method.
*/
final BTManager manager;
try {
manager = BTFactory.getDBusBTManager();
} catch (BTException | NoSuchMethodException | SecurityException
| IllegalAccessException | IllegalArgumentException
| InvocationTargetException | ClassNotFoundException e) {
System.err.println("Failed to initialized "+BTFactory.DBusImplementationID);
throw new RuntimeException(e);
}
/*
* The manager will try to initialize a BluetoothAdapter if any adapter is present in the system. To initialize
* discovery we can call startDiscovery, which will put the default adapter in discovery mode.
*/
@SuppressWarnings("deprecation")
final boolean discoveryStarted = manager.startDiscovery();
System.out.println("The discovery started: " + (discoveryStarted ? "true" : "false"));
/*
* After discovery is started, new devices will be detected. We can find the device we are interested in
* through the manager's find method.
*/
final BTDevice sensor = manager.find(null, args[0], null, 10000);
/*
* After we find the device we can stop looking for other devices.
*/
try {
manager.stopDiscovery();
} catch (final BTException e) {
System.err.println("Discovery could not be stopped right now");
}
if (sensor == null) {
System.err.println("No sensor found with the provided address.");
System.exit(-1);
}
System.out.print("Found device: ");
printDevice(sensor);
if ( HCIStatusCode.SUCCESS == sensor.connect() )
System.out.println("Sensor with the provided address connected");
else {
System.out.println("Could not connect device.");
System.exit(-1);
}
final Lock lock = new ReentrantLock();
final Condition cv = lock.newCondition();
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
running = false;
lock.lock();
try {
cv.signalAll();
} finally {
lock.unlock();
}
}
});
/*
* Our device should expose a temperature service, which has a UUID we can find out from the data sheet. The service
* description of the SensorTag can be found here:
* http://processors.wiki.ti.com/images/a/a8/BLE_SensorTag_GATT_Server.pdf. The service we are looking for has the
* short UUID AA00 which we insert into the TI Base UUID: f000XXXX-0451-4000-b000-000000000000
*/
final BTGattService tempService = sensor.find( "f000aa00-0451-4000-b000-000000000000");
if (tempService == null) {
System.err.println("This device does not have the temperature service we are looking for.");
sensor.disconnect();
System.exit(-1);
}
System.out.println("Found service " + tempService.getUUID());
final BTGattChar tempValue = tempService.find("f000aa01-0451-4000-b000-000000000000");
final BTGattChar tempConfig = tempService.find("f000aa02-0451-4000-b000-000000000000");
final BTGattChar tempPeriod = tempService.find("f000aa03-0451-4000-b000-000000000000");
if (tempValue == null || tempConfig == null || tempPeriod == null) {
System.err.println("Could not find the correct characteristics.");
sensor.disconnect();
System.exit(-1);
}
System.out.println("Found the temperature characteristics");
/*
* Turn on the Temperature Service by writing 1 in the configuration characteristic, as mentioned in the PDF
* mentioned above. We could also modify the update interval, by writing in the period characteristic, but the
* default 1s is good enough for our purposes.
*/
final byte[] config = { 0x01 };
tempConfig.writeValue(config, false /* withResponse */);
/*
* Each second read the value characteristic and display it in a human readable format.
*/
while (running) {
final byte[] tempRaw = tempValue.readValue();
System.out.print("Temp raw = {");
for (final byte b : tempRaw) {
System.out.print(String.format("%02x,", b));
}
System.out.print("}");
/*
* The temperature service returns the data in an encoded format which can be found in the wiki. Convert the
* raw temperature format to celsius and print it. Conversion for object temperature depends on ambient
* according to wiki, but assume result is good enough for our purposes without conversion.
*/
final int objectTempRaw = (tempRaw[0] & 0xff) | (tempRaw[1] << 8);
final int ambientTempRaw = (tempRaw[2] & 0xff) | (tempRaw[3] << 8);
final float objectTempCelsius = convertCelsius(objectTempRaw);
final float ambientTempCelsius = convertCelsius(ambientTempRaw);
System.out.println(
String.format(" Temp: Object = %fC, Ambient = %fC", objectTempCelsius, ambientTempCelsius));
lock.lock();
try {
cv.await(1, TimeUnit.SECONDS);
} finally {
lock.unlock();
}
}
sensor.disconnect();
}
}
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