Apple

You need to make sure that your device is including the service in the advertisement data or iOS won’t be able to find it when scanning for a specific service.

Cheers,

Mike

From: bluetooth-dev-bounces+michael.mallinson=email@hidden [mailto:bluetooth-dev-bounces+michael.mallinson=email@hidden] On Behalf Of Ed
Sent: Friday, May 17, 2013 9:55 AM
To: email@hidden
Subject: device scanning only finds devices when using NIL for UUID list

In all my attempts to build BTLE apps I never was able to get scan results when filtering specific services. Several examples from apple show the way that filtering should work but those did not help me. This means that the approach did not work for the hardware I have.

I'm testing with a ConnectBlue OLP425i-ES, a device equipped with 3D sensor, temperature and LED control. CBCentralManager scanning with no filtering (NIL) finds the device and enables me to access all sensors.

The peripheral name is shows OBP425-D7FD.

Next fragment shows some logging of all kinds of code that were retrieved from hardware.

2013-05-16 08:28:54.418 BtCoreTest[173:907] Service found with UUID: Generic Access Profile

2013-05-16 08:28:54.419 BtCoreTest[173:907] Service found with UUID: Generic Attribute Profile

2013-05-16 08:28:54.421 BtCoreTest[173:907] Service found with UUID: Unknown (<180a>)

2013-05-16 08:28:54.422 BtCoreTest[173:907] Service found with UUID: Unknown (<180f>)

2013-05-16 08:28:54.423 BtCoreTest[173:907] Service found with UUID: Unknown (<ffa0>)

2013-05-16 08:28:54.425 BtCoreTest[173:907] call discoverCharacteristics for Unknown (<ffa0>)

2013-05-16 08:28:54.428 BtCoreTest[173:907] Service found with UUID: Unknown (<ffe0>)

2013-05-16 08:28:54.432 BtCoreTest[173:907] Service found with UUID: Unknown (<ffd0>)

2013-05-16 08:28:54.434 BtCoreTest[173:907] call discoverCharacteristics for Unknown (<ffd0>)

2013-05-16 08:28:54.438 BtCoreTest[173:907] Service found with UUID: Unknown (<2456e1b9 26e28f83 e744f34f 01e9d701>)

2013-05-16 08:28:54.443 BtCoreTest[173:907] found characteristic for Unknown (<ffa0>) Unknown (<ffa2>)

2013-05-16 08:28:54.445 BtCoreTest[173:907] found characteristic for Unknown (<ffa0>) Unknown (<ffa3>)

2013-05-16 08:28:54.446 BtCoreTest[173:907] Setting notify

2013-05-16 08:28:54.449 BtCoreTest[173:907] found characteristic for Unknown (<ffa0>) Unknown (<ffa4>)

2013-05-16 08:28:54.451 BtCoreTest[173:907] Setting notify

2013-05-16 08:28:54.454 BtCoreTest[173:907] found characteristic for Unknown (<ffa0>) Unknown (<ffa5>)

2013-05-16 08:28:54.455 BtCoreTest[173:907] Setting notify

2013-05-16 08:28:54.457 BtCoreTest[173:907] found characteristic for Unknown (<ffd0>) Unknown (<ffd1>)

2013-05-16 08:28:54.459 BtCoreTest[173:907] found characteristic for Unknown (<ffd0>) Unknown (<ffd2>)

Example code like the following never resulted in calls to didDiscoverPeripheral:

NSArray *uuidArray = [NSArray arrayWithObjects:[CBUUID UUIDWithString:"180A"], nil];

NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:CBCentralManagerScanOptionAllowDuplicatesKey];

[centralManager scanForPeripheralsWithServices:uuidArray options:options];

Example code uses UUID strings like:

NSString *kTemperatureServiceUUIDString = @"DEADF154-0000-0000-0000-0000DEADF154";

How can I convert the 4 nibble codes that where captured in the log data ( i.e. ffe0 or 180a) to the 128 bit UUID? Or is that not the cause of the problem?

Thanks in advance,

Eddy