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POCorebluetooth central manager callback didDiscoverPeripheral twice
 

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  1. POCorebluetooth central manager callback didDiscoverPeripheral twice
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    <p>I scan for my peripheral like this:</p> <pre><code>NSDictionary *scanOptions = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:CBCentralManagerScanOptionAllowDuplicatesKey]; // Scan for peripherals with given UUID [cm scanForPeripheralsWithServices:[NSArray arrayWithObject:HeliController.serviceUUID] options:scanOptions] </code></pre> <p>No problem there, I find the peripheral and are able to connect to it. As you can see I give it <code>CBCentralManagerScanOptionAllowDuplicatesKey</code> with <code>bool NO</code> to not allow for more than one peripheral, but sometimes the <code>didDiscoverPeripheral</code>callback fires twice. </p> <pre><code>- (void) centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI { if(!discovered){ discovered = YES; NSLog(@"Discovered"); [cm stopScan]; [scanButton setTitle:@"Connect" forState:UIControlStateNormal]; } else if(discovered){ discovered = YES NSLog(@"Already discovered"); } } </code></pre> <p>Some times I get </p> <pre><code>Discovered Already discovered </code></pre> <p>as output in my console, and most of the times only the <code>Discovered</code>message shows. </p> <p>In my peripheral delegate I first discover services, which then call <code>[peripheral discoverCharacteristics</code> and the callback always occurs:</p> <pre><code>- (void) peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error{ NSLog(@"Did discover characteristic for service %@", [service.peripheral UUID]); for(CBCharacteristic *c in [service characteristics]){ // We never get here when peripheral is discovered twice if([[c UUID] isEqual:myCharacteristicUUID]){ NSLog(@"Found characteristic"); self.throttleCharacteristic = c; } } </code></pre> <p>When <code>didDiscoverPeripheral</code> occur twice, <code>service</code> becomes <code>nil</code>in this method, even though <code>peripheral</code> is not (UUID, name is still correct). </p> <p>Rebooting the phone or resetting the network settings fixes the problem temporarily. </p> <p>I really need to get this fixed! Thank you</p>
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    1. COWhat was the "no more than one device" parameter you gave?
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    2. COfalse on CBCentralManagerScanOptionAllowDuplicatesKey
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    3. COMy guess is that it's getting called twice when the signal strength is poor.
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