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POIs there a way to discover BLE peripheral service faster?
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copied!<p>I find that my implementation of the BLE protocol in iOS7 to be very slow in the start up phase. The startup sequence amounts to ~68% of the whole execution time in my app.</p> <p>What can I do to make it faster?</p> <p>I've timed it, and here's what I get.</p> <pre><code> t dt 37.598 [BLE] Discovered peripheral at RSSI -27 with UUID:XYZ 37.599 0.001 [BLE] Connecting to peripheral 37.602 0.003 [BLE] Scanning stopped 37.685 0.083 [BLE] Peripheral connected 38.48 0.795 [BLE] Discovered service 38.599 0.119 [BLE] Discovered characteristic </code></pre> <p>As you can see there's a huge bottle neck before discovering the service.</p> <p>My startup code simplified:</p> <pre><code>- (void)centralManagerDidUpdateState:(CBCentralManager *)central { switch (central.state) { case CBCentralManagerStatePoweredOn: [central scanForPeripheralsWithServices:@[[CBUUID UUIDWithString:kServiceUuid]] options:@{CBCentralManagerScanOptionAllowDuplicatesKey : @YES}]; break; case CBCentralManagerStatePoweredOff: [central stopScan]; break; default: break; } } - (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI { if (self.discoveredPeripheral != peripheral) { self.discoveredPeripheral = peripheral; // Save a local copy of the peripheral, so CoreBluetooth doesn't get rid of it [central connectPeripheral:peripheral options:nil]; [central stopScan]; } } - (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral { [peripheral discoverServices:@[[CBUUID UUIDWithString:kServiceUuid]]]; } - (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error { for (CBService *service in peripheral.services) { [peripheral discoverCharacteristics:@[array of characteristics] forService:service]; } } - (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error { ... } </code></pre> <p><strong>EDIT</strong></p> <p>I've learned that similar apps on Android does this ten times faster (making the Android app feel snappier -> better user experience) so I'm curious if it's my implementation, BLE layer or hardware that's the bottleneck. It's tested on an iPhone 4S.</p>

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