iOS 核心蓝牙 : Advertised service is not discovered on peripheral

Question

连接到广播我感兴趣的特定服务的 BLE 设备后，为了发现此服务，我正在调用:

[self.peripheral discoverServices:@[[self.class serviceUUID]]];

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error 委托(delegate)方法被调用且没有错误，但为外围设备返回的服务数量为 0，并且因此没有进一步发现特征。有谁知道为什么会这样？提前致谢!

下面是委托(delegate)方法的完整主体。

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error {
    if (error) {
        NSLog(@"didDiscoverServices failed: %@", error);
        return;
    }

    NSLog(@"didDiscoverServices succeeded for peripheral: %@.", peripheral.name);
    NSLog(@"Number of services: %d", peripheral.services.count);

    for (CBService *s in peripheral.services) {
        NSLog (@"Discovered service UUID: %@", s.UUID);
        if ([s.UUID isEqual:[self.class serviceUUID]]) {
            NSLog(@"Discover characteristics...");
            [self.peripheral discoverCharacteristics:@[[self.class controlPointCharacteristicUUID], [self.class packetCharacteristicUUID]] forService:s];
        }
    }
}

控制台显示:

2014-11-27 15:54:51.933 k[197:13362] didDiscoverServices succeeded for peripheral: BootK
2014-11-27 15:54:51.934 k[197:13362] Number of services: 0

Answer 1

我唯一能想到的是 [self.class serviceUUID] 与您要查找的服务的 UUID 不匹配。启动扫描时，是否按服务 UUID 进行过滤？

[self.centralManager scanForPeripheralsWithServices:[self.class serviceUUID] options:nil];

如果没有，这可能可以解释为什么您能够发现并连接到它，但不能发现该特定服务。