蓝牙LE设备从iOS后台扫描 [英] Bluetooth LE Device scan in background from iOS

问题描述

我正在以背景模式扫描BLE。

I am working on to scan BLE in Background mode.

问题在后台扫描中无效。它在前景模式下工作得非常好。

下面是几行代码。

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];
}

这里我将nil作为服务传递。

我在Xcode中收到登录设备部分。但不是在申请中。

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

推荐答案

您无法在后台扫描 nil 服务 - 您必须指定您感兴趣的服务。来自 documentation

You cannot scan for nil services in the background - you must specify the service(s) that you are interested in. From the documentation

指定蓝牙中央后台模式的应用程序是允许在后台扫描的
。也就是说，他们必须通过在
serviceUUIDs参数中指定
来明确扫描一个或多个服务。

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.

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