Get advertisement data for BLE in iOS

问题:

I'm creating an app that gets the UUID of all BLE devices within range. I've gotten it working fine in Android, where it gives me the advertisement data as a byte array. Now I'm trying to do the same in iOS.

I'm running a scan and it's detecting the device, and in the callback there's an NSDictionary called advertisementData. But the only information in it is as follows:

kCBAdvDataChannel = 39;
kCBAdvDataIsConnectable = 1;
kCBAdvDataLocalName = jaalee;
kCBAdvDataTxPowerLevel = 0;

Am I right in thinking I should be getting the entirety of the advertising packet? If not, how can I get it?

回答1:

Unfortunately, iOS does not allow you to access the raw advertisement data. I wrote a blog post demonstrating this. While the post is specifically about iBeacons, it applies to any BLE advertisement.

EDIT: To clarify, you can read the raw bytes of non-iBeacon advertisements. It is only the iBeacon advertisements that have their bytes hidden by CoreLocation. See here: Obtaining Bluetooth LE scan response data with iOS

The equivalent OSX CoreLocation methods do allow this, so it is probably an intentional security or power saving restriction on iOS.

回答2:

Based on official documentation from Apple iOS and my personal experience:

YES, iOS does not allow you to access the RAW advertisement data.

BUT

If your intention is to put information in advertising packet and read them from the iOS app without connect with the peripheral, this is possible to do. Here is described how:

1) in the peripheral firmware you have to insert your manufacturer specifica data in the advertising packet, with the data type GAP_ADTYPE_MANUFACTURER_SPECIFIC (0xFF) Remember that in the Manufacturer Specific Data, first 2 octets contain the Company Identifier Code followed by the additional manufacturer specific data

2) in the iOS

- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI

You can see the manufacturer specific data in advertisementData dictionary with key:

CBAdvertisementDataManufacturerDataKey

3) if you want that in your App receive a callback notification every advertising packet sent by peripheral to iOS, remember to change the scan option to YES. Look at this post about that: Core Bluetooth - constant RSSI updates of in-range devices

In my blog post will be soon a tutorial: http://www.megabri.com/