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現實⽣生活中的經驗使⽤用 BLE
David Chu

Monday, November 18, 13
core bluetooth timeLINE

WWDC 2013

Monday, November 18, 13

開始

讀書

睡好

現在
core bluetooth timeLINE

WWDC 2013

Monday, November 18, 13

開始

讀書

睡好

現在
BT4.0 Not Backwards
Compatible
1.0

Monday, November 18, 13

2.0

3.0

4.0
Streaming @ Max 30 mA

Classic
Packets @ Max 15 mA

4.0
Monday, November 18, 13
Hardware

Monday, November 18, 13
BLE Specs
Range
Data

1 Mbps

Power

1 year

Proximity

Monday, November 18, 13

50 m

RSSI
Power
1 year?

Monday, November 18, 13
Monday, November 18, 13
Monday, November 18, 13
CR2032
225 mAh

Data Transaction Time

3s

Max Antenna Power

15 mA

225 mAh / 15mA = 15 hours
15 hours = 54,000,000 ms
54M ms / 3 ms = 18M transactions
1 transaction every second = ~7 months
Monday, November 18, 13
Data
1 Mbps?

Monday, November 18, 13
Bluetooth
HW
Bluetooth
SW

270 kbps

Streaming Music
120 - 320 kps

Real Life

Monday, November 18, 13

1 Mbps

Streaming Video
720x486

Max 56 kbps

?
Monday, November 18, 13
Monday, November 18, 13
Range
50 m?

Monday, November 18, 13
Monday, November 18, 13
Monday, November 18, 13
Monday, November 18, 13
Actual Range
Bluetooth Spec Range
50 m

Our Tested Range
30 m

Monday, November 18, 13
Still Need Testing

Monday, November 18, 13
Proximity
RSSI Accuracy?

Monday, November 18, 13
Standing Still

Monday, November 18, 13
Software

Monday, November 18, 13
Core Bluetooth
App States and Multitasking
State Preservation and Restoration

Monday, November 18, 13
iOS as bluetooth-central
• Scan
• Connect
• Read
• Write
• Subscribe
Monday, November 18, 13
Monday, November 18, 13
Monday, November 18, 13
Monday, November 18, 13
Monday, November 18, 13
[centralManager scanForPeripheralsWithServices:serviceUUIDs options:options];

Core Bluetooth

peripheral
Bluetooth Device Address
00:22:D0:00:AC:92

BDA

NSUUID
Your App

(NSUUID *) peripheral.identifier =
68753A44-4D6F-1226-9C60-0050E4C00067

// CBCentralManagerDelegate
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral
advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
// peripheral.services is empty until you call [peripheral discoverServices:];
NSArray *serviceUUIDs = [advertismentData objectForKey: CBAdvertisementDataServiceUUIDsKey];
}
Monday, November 18, 13
(NSDictionary *)advertisementData
CBAdvertisementDataLocalNameKey

Name of Device

CBAdvertisementDataManufacturerDataKey

ID for Manufacturer

CBAdvertisementDataServiceDataKey

Dictionary with serviceUUIDs and data

CBAdvertisementDataServiceUUIDsKey

Array of serviceUUIDs

CBAdvertisementDataTxPowerLevelKey

Power Level of Transmission (optional)

CBAdvertisementDataIsConnectable

If Device data is connectable

Monday, November 18, 13
[centralManager connectPeripheral:peripheral options:options];

iOS Keychain

peripheral
Bluetooth Device Address
00:22:D0:00:AC:92

BDA
NSUUID

Your App

Monday, November 18, 13

(NSUUID *) peripheral.identifier =
68753A44-4D6F-1226-9C60-0050E4C00067
// Check Peripherals That Your App Has Connected To Before
- (NSArray *)retrievePeripheralsWithIdentifiers:(NSArray *)identifiers

// Check Peripherals Already Connected To iPhone
// Peripherals may be connected to other apps, but not yours
- (NSArray *)retrieveConnectedPeripheralsWithServices:(NSArray *)serviceUUIDs

// Scan For New Peripherals
- (void)scanForPeripheralsWithServices:(NSArray *)serviceUUIDs options:(NSDictionary *)options
// Callback in CBCentralManagerDelegate
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral
advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI

-connectPeripheral:options:
Monday, November 18, 13
CBCentralManager
Scan for all peripherals

Foreground

Can have multiple peripheral
discoveries
Scan frequency normal

CBPeripheralManager

Service UUIDs are advertised
Device Name advertised
Advertising frequency highest

Can only scan for service UUID

Monday, November 18, 13

Peripheral discovered only once

Device Name is hidden

Scan frequency 55x less

Background

ServiceUUIDs are hidden

Advertising frequency decreased
Reconnecting Peripheral
Foreground
Active - Visible

Background
Active - Not Visible

Suspended
Inactive - In Memory

Terminated
Not in Memory

Monday, November 18, 13

// CBCentralMangerDelegateProtocol
- centralManager:central didDisconnectPeripheral:peripheral error:error
{
if (error) {
// User did not cancel connection. Reconnect.
// Connection Requests DO NOT TIME OUT
[central connectPeripheral:peripheral options:nil];
}
}
// CBCentralMangerDelegateProtocol
- centralManager:central didConnectPeripheral:peripheral
{
// App will be brought back to background state
}

State Preservation and Restore
Scanning For Peripherals
Foreground
Active - Visible

Background
Active - Not Visible

Suspended
Inactive - In Memory

Terminated
Not in Memory

Monday, November 18, 13

// CBCentralMangerDelegateProtocol
- (void)centralManager:(CBCentralManager *)central
didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:
(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
// Device can connect to BLE Peripheral and run task
// In Background, you have 10s to complete task.
// Background scanning also runs 55X slower or more.
}

Scanning is not possible
iOS cannot guarantee that you will not be
suspended or that you will be brought back to
background once suspended.
Your
App

Monday, November 18, 13

If the user removes your app
in the multi-tasking window,
then all your background
operations stop.
Resources

Monday, November 18, 13
LightBlue

Monday, November 18, 13
https://github.com/ddaddy/BackgroundKill

Monday, November 18, 13
https://lists.apple.com/mailman/listinfo/bluetooth-dev

Monday, November 18, 13
Monday, November 18, 13

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