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.
为了让您的应用程序继续在后台接收蓝牙更新,您需要在Info.plist
添加UIBackgroundModes
条目,并在列表中包含值bluetooth-central
。
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