I am working on to scan BLE in Background mode.
Issue is not working in Background scan. Its working very fine in Foreground mode.
Below is few code lines.
dispatch_queue_t centralQueue = dispatch_queue_create("com.XXXXX.BLEback", DISPATCH_QUEUE_SERIAL);// or however you want to create your dispatch_queue_t
manager = [[CBCentralManager alloc] initWithDelegate:self queue:centralQueue options:nil];
- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
if (central.state == CBCentralManagerStatePoweredOn) {
[self startScan];
}
if (![self supportLEHardware])
{
@throw ([NSError errorWithDomain:@"Bluetooth LE not supported"
code:999
userInfo:nil]);
}
}
- (void)startScan
{
NSDictionary * options = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:false] forKey:CBCentralManagerScanOptionAllowDuplicatesKey];
[manager scanForPeripheralsWithServices:nil options:options];
}
here i am passing nil as a services.
I receive log in Devices section in Xcode. But not in application.
Notice>: (Error) Discovered unknown type for scan: {
kCBAdvDataChannel = 37;
kCBAdvDataIsConnectable = 1;
kCBAdvDataManufacturerData = <00003962 6708f4c1 00000000 00d02b00 20d03300 20d03300 20>;
kCBAdvDataWSaturated = 0;
kCBAdvDataWlanRSSI = 0;
}, -51, puck type: 57
You cannot scan for nil
services in the background - you must specify the service(s) that you are interested in. From the documentation
Apps that have specified the bluetooth-central background mode are allowed to scan while in the background. That said, they must explicitly scan for one or more services by specifying them in the serviceUUIDs parameter.