Core BluetoothCocoaHeads Sthlm 2014

Edward Patel

teaser

Me

• I work at

• Love programming

• Love gadgets

• Love programming gadgets

Bluetooth Low Energy

WWDC’13 Keynote• Anki DRIVE

Bluetooth Low Energy

• Invented by researchers at Nokia

• For small things

• Run a long time on a coin-cell battery

• Look for “Internet-of-Things”

iOS

• Introduced in iOS 5

• Extended in iOS 6 (can become a “Peripheral”)

• Cleaning API in iOS 7 + better caching andhandling including backgrounding.

Framework

Core Bluetooth Framework ReferenceThe Core Bluetooth framework provides the classes needed for your iOS and Mac apps to communicate with devices that are equipped with Bluetooth low energy wireless technology.

 

Protocol ReferencesCBCentralManagerDelegateCBPeripheralDelegateCBPeripheralManagerDelegate

Class ReferencesCBATTRequestCBCentralCBCentralManagerCBCharacteristicCBDescriptorCBMutableCharacteristicCBMutableDescriptorCBMutableServiceCBPeripheralCBPeripheralManagerCBServiceCBUUID

Other ReferencesCore Bluetooth Constants

There are only two hard things in Computer Science:

cache invalidation naming things

off-by-one errors

PeripheralCentral

has datawants data

(server)(client)

Naming things...

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Service

Characteristic

Characteristic

Service

Characteristic

Characteristic

Peripheral

Characteristic

• Can be read, and writable

• Can be integers, strings etc

• Can be “Notifiable”

GATT

• A kind of contract known in advance

• Defines a number of UUID’s for Services and Characteristics and value types.

• There are standardized ones,i.e Heart rate monitors

• You can define your own

Service

Characteristic

Characteristic

Service

Characteristic

Characteristic

Generic Attribute Profile

https://developer.bluetooth.org/gatt/

Find the standardized?

UUID’s

• Standardized by Bluetooth SIG are short, 16 bit

• Free are long, 128 bits

“0CDA25F083E54CBCB7C97FB2AC3DC476”

“180D”

Heart rate monitor service

Your own message service

Discover Peripherals with Services

Connect to Peripheral

Discover Services for Peripheral

Discover Characteristics for Service

Workflow of a Central in iOS

Create a CBCentralManager

Where to start?

• LightBlue - Bluetooth Low Energy

• TI BLE Multitool

Download some apps from App Store

Do it now!

Get some hardware?

• SensorTag (6 sensors)

• Arduino Shields, i.e. Tinyduino or BLE Shield

• BLE Mini by RedBearLabs

• BLE-112 Evaluation board

• Gimbal iBeacon

• Or just use two iPhones

Get some sample code?

• HiBeacons by Nick Toumpelis (a Spotifier)

• Temperature Sensor by Apple

• Also, checkout WWDC videos

Thanks!