Bluetooth Low energy silently appeared in all Apple hardware in the course of last two years, Android followed suit with API level 18. The session reviews the technology, the APIs and potential use cases.

1. Bluetooth Low Energy
Uncovered
Gabe Gindele
@barbazoo
Friday, October 18, 13

2. Tech Overview
• “A Better Bluetooth” - Power and Cost
• 4.0 - Single and Dual Mode
• 3 Advertising, 37 Data Channels
• Advertiser vs. Scanner
• Master vs. Slave
Friday, October 18, 13

3. Classic vs. Low Energy
• 100mW vs. 10mW power
• Connection Oriented vs. Connectionless
• Streaming Data vs. Small Data Bursts
• HCI API stays intact
Friday, October 18, 13

4. Tech Overview Cont.
Total Transaction Time: 3ms
Friday, October 18, 13

5. Apple and Bluetooth LE
• First to Introduce
• iPhone 4S, MBA, Mac Mini since 2011
• WWDC 2012 Sessions
• All Products Today - Apple TV
• Classic remains under MFA
• Opens new era of Sensors and IOT
Friday, October 18, 13

6. Devices Today
• Fitbit Flex
• Heart Rate monitors
• SmartWatches
• Proximity
• iBeacons
• Sensors
Friday, October 18, 13

7. GATT
• Service
• Characteristic
• Value
• Descriptors
• Notifications
• APIs are Asynchronous
Friday, October 18, 13

8. iOS: Discovery
central
=
[[CBCentralManagernager
alloc]
initWithDelegate:self
queue:nil];
[central
scanForPeripheralsWithServices:nil
options:nil];
-­‐
(void)centralManager:(CBCentralManager
*)central
didDiscoverPeripheral:(CBPeripheral
*)peripheral
advertisementData:(NSDictionary
*)advertisementData
RSSI:(NSNumber
*)RSSI
{}
[myCentralManager
stopScan];
Friday, October 18, 13

9. iOS: Connection
[myCentralManager
connectPeripheral:peripheral
options:nil];
-­‐
(void)centralManager:(CBCentralManager
*)central
didConnectPeripheral:(CBPeripheral
*)peripheral
{}
peripheral.delegate
=
self;
[peripheral
discoverServices:nil];
[peripheral
discoverCharacteristics:nil
forService:...];
[peripheral
readValueForCharacteristic:...];
[peripheral
setNotifyValue:YES
forCharacteristic:...;
[peripheral
writeValue:...
type:CBCharacteristicWriteWithResponse]
Friday, October 18, 13

10. Android: BluetoothGatt
• Since 4.3 - API 18 - Most of new devices
• A new profile
• GATT Server is missing
Friday, October 18, 13

11. Android: Discovery
mBluetoothAdapter.startLeScan(mLeScanCallback);
public
void
onLeScan(final
BluetoothDevice
device,
int
rssi,
byte[]
scanRecord)
{};
mBluetoothAdapter.stopLeScan(mLeScanCallback);
Friday, October 18, 13

12. Android: Connection
BluetoothGatt
mBtGatt
=
device.connectGatt(...
callback);
BluetoothGattCallback
callback
=
new
BluetoothGattCallback()
{
public
void
onConnectionStateChange(...)
{}
public
void
onServicesDiscovered(...)
{}
public
void
onCharacteristicRead(...)
{}
public
void
onCharacteristicChanged(...)
{}
};
mBtGatt.setCharacteristicNotification(characteristic,
enabled);
onCharacteristicChanged(BluetoothGatt
gatt,
BluetoothGattCharacteristic)
{}
Friday, October 18, 13

13. iBeacon
• Best Kept Secret of iOS7
• Micro Locations Made Simple
• API extends CoreLocation - CLBeacon
• Broadcast only - UUID, Major, Minor
• Geofence, Passbook
Friday, October 18, 13

14. Development Tools
• TI CC2541 Sensor Tag
• BlueGiga BGScript and API
• Nordic nRF51922 with Cortex M0
• RadiusNetworks Android iBeacons SDK
Friday, October 18, 13

15. Questions?
Friday, October 18, 13