When I use: CBUUID * uuid = [CBUUID UUIDWithString:@"1800"]; // GAP DEBUG_LOG(@"CBUUID: %@",uuid); // CBUUID: Generic Access Profile _centralMan = [[CBCentralManager alloc] initWithDelegate:self queue:nil]; [_centralMan scanForPeripheralsWithServices:[NSArray arrayWithObject:uuid] options:nil]; I cannot find my peripheral, but when I use: _centralMan = [[CBCentralManager alloc] initWithDelegate:self queue:nil]; [_centralMan scanForPeripheralsWithServices:nil options:nil]; …it shows up immediately. When I connect, I am able to discover/read/write to all the services I am expecting. My understanding is that GAP makes this possible. I have also tried CBUUID's for other services that I know are running (specifically "1804", TX power service), to no avail; the scan never discovers anything. Even though the services are running (I can communicate w/ them upon connecting), when I scan passing the service UUID array as `nil` and this delegate method is called... -(void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI { DEBUG_LOG(@"Found peripheral w/ UUID: %@ RSSI: %@ \n AdvData: %@",peripheral.UUID,RSSI,advertisementData); DEBUG_LOG(@"Services found: %d",peripheral.services.count); for (CBService * service in peripheral.services) { DEBUG_LOG(@"Found service: %@ w/ UUID %@",service, service.UUID); } } …it always reports "Services found: 0". Should I expect the `services` array to be populated w/ services found during the scan? (I assume this is at least partially possible, based on `scanForPeripheralsWithServices:[NSArray arrayWithObject:uuid] options:nil`.) Could this be a problem w/ my peripheral's service advertisements? Am I using the API incorrectly? Any guidance is much appreciated! :-) --Ben Mosher PS: I'm pretty green w/ Bluetooth. PPS: I control the source to the peripheral (it's a CC2540DK). So I'd be as likely to believe the problem is there as it is here. _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists.... This email sent to site_archiver@lists.apple.com