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    <p>After some digging around, here's what I discovered:</p> <p>The advertisement data passed as a parameter to the centralManager:didDiscoverPeripheral:advertisementData:RSSI is an NSDictionary that always seems to contain at least one key called kCBAdvDataServiceUUIDs. The value associated with this key is an NSArray of objects of type CBUUID.</p> <p>CBUUID is not documented in the iOS 5 documentation, despite the fact that it is used in many places, including every Apple sample for Bluetooth LE I've seen. Among it's methods is one called <code>data</code> that returns an NSData object. This NSData object has the UUID encoded as a series of bytes.</p> <p>So, to get and, in this case, view the bytes in the UUIDs of a BLE advertisement, you can use code such as the following:</p> <pre><code>- (void) centralManager: (CBCentralManager *) central didDiscoverPeripheral: (CBPeripheral *) aPeripheral advertisementData: (NSDictionary *) advertisementData RSSI: (NSNumber *) RSSI { printf("Discovered %s\n", [[aPeripheral name] cStringUsingEncoding: NSUTF8StringEncoding]); // TODO: Remove printfs printf(" RSSI: %s\n", [[RSSI stringValue] cStringUsingEncoding: NSUTF8StringEncoding]); NSArray *keys = [advertisementData allKeys]; for (int i = 0; i &lt; [keys count]; ++i) { id key = [keys objectAtIndex: i]; NSString *keyName = (NSString *) key; NSObject *value = [advertisementData objectForKey: key]; if ([value isKindOfClass: [NSArray class]]) { printf(" key: %s\n", [keyName cStringUsingEncoding: NSUTF8StringEncoding]); NSArray *values = (NSArray *) value; for (int j = 0; j &lt; [values count]; ++j) { if ([[values objectAtIndex: j] isKindOfClass: [CBUUID class]]) { CBUUID *uuid = [values objectAtIndex: j]; NSData *data = uuid.data; printf(" uuid(%d):", j); for (int j = 0; j &lt; data.length; ++j) printf(" %2X", ((UInt8 *) data.bytes)[j]); printf("\n"); } else { const char *valueString = [[value description] cStringUsingEncoding: NSUTF8StringEncoding]; printf(" value(%d): %s\n", j, valueString); } } } else { const char *valueString = [[value description] cStringUsingEncoding: NSUTF8StringEncoding]; printf(" key: %s, value: %s\n", [keyName cStringUsingEncoding: NSUTF8StringEncoding], valueString); } } } </code></pre>
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