从 iOS 设备上的 BLE 获取制造商数据

Question

In my Xamarin.Android app, I can read Manufacturer Data from BLE with the following code:

public class CustomScanCallback : ScanCallback
{
    public override void OnScanResult([GeneratedEnum] ScanCallbackType callbackType, ScanResult result)
    {
        base.OnScanResult(callbackType, result);

        if (result.ScanRecord.ManufacturerSpecificData != null)
        {
            var dataByteResult = result.ScanRecord.GetManufacturerSpecificData(0xFFFE);

            if (dataByteResult != null)
            {
                Guid dataResult = new Guid(dataByteResult);

                if (dataResult.ToString() == "myUuid")
                {
                    // found the uuid from my UWP app
                }
            }
        }
    }
}

How can I do the same on Xamarin.iOS? I have a callback for when peripherals are discovered:

_cbCentralManager.DiscoveredPeripheral += CBCentralManager_DiscoveredPeripheral;

private void CBCentralManager_DiscoveredPeripheral(object sender, CBDiscoveredPeripheralEventArgs e)
{
    // how to find "myUuid" ?
}

And have tried many things to find it, but couldn't. An answer in Swift/Obective-C would help too as I can translate it to C#.

EDIT

I looked through the advertisement data parameter with the key CBAdvertisementDataManufacturerDataKey and found the value:

<06000109 2002aa4e 7e54b91f 2212c398 74eb0fe9 9fc3ecce 4ce76d8f aa>

It looks like it's encoded in hex format, but don't think it's my uuid that I am looking for...

Answer 1

Hex code is the NSData which you can see it is from these docs. To get that into a string I would use the following.

     NSData data = NSData.FromData(theValueFromDictionary);
     string uuidString = data.ToString();
     //Try this if the other line doesn't work. But string encoding should be UTF-16 (the default) or UTF-8
     //string uuidString = data.ToString(NSStringEncoding.UTF8);

If that isn't your desired string then you could play around with the type of encoding you are using, but in my experience apple usually goes between data and strings with UTF-8 .

Perhaps the UUID is another key in this dictionary. Take a look a look at all the available keys here

Answer 2

You can get the manufacturer info in the advertisementData. Following this code .

#pragma mark - CBCentralManagerDelegate
- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *,id> *)advertisementData RSSI:(NSNumber *)RSSI {
    NSString *manufacturer = [advertisementData objectForKey:CBAdvertisementDataManufacturerDataKey];
    NSLog(@"manufacturer:%@", manufacturer); 
}