private IBeaconAdModel TryParseAppleIBeacon(AdStructure adStruct, string bluetoothAddress)
{
try {
// Check length of struct
// (AD_APPLE_IBEACON_SIZE - 1 additional ad struct, size & struct ID bytes from this struct)
if (adStruct.Data.Length != AD_APPLE_IBEACON_SIZE - 5)
{
return(null);
}
var data = adStruct.Data;
var id = data.Take(2).ToHexString(true);
if (!string.Equals(id, APPLE_ID, StringComparison.OrdinalIgnoreCase))
{
return(null);
}
if (data[2] != 0x02)
{
return(null);
}
if (data[3] != 0x15)
{
return(null); // length
}
var proximityUUID = data.Skip(4).Take(16).ToHexString();
var major = BitConverter.ToUInt16(data.Skip(20).Take(2).Reverse().ToArray(), 0);
var minor = BitConverter.ToUInt16(data.Skip(22).Take(2).Reverse().ToArray(), 0);
var measuredPower = (sbyte)data.Last();
var appleIBeaconData = new IBeaconAdModel {
Major = major,
Minor = minor,
ProximityUUID = proximityUUID,
MeasuredPower = measuredPower,
BluetoothAddress = bluetoothAddress
};
Debug.WriteLine(
$"Parsed AppleIBeaconAdData: " +
$"maj={appleIBeaconData.Major} " +
$"min={appleIBeaconData.Minor} " +
$"prox={appleIBeaconData.ProximityUUID} " +
$"txpwr={appleIBeaconData.MeasuredPower}"
);
return(appleIBeaconData);
} catch (Exception ex) {
Debug.WriteLine($"Error while parsing AppleIBeacon ad: {ex.GetBaseException().Message}");
return(null);
}
}
public static Dictionary <GAPAdType, AdStructure> ParseAdData(byte[] ad)
{
if (ad == null || ad.Length == 0)
{
return(null);
}
var adStructDict = new Dictionary <GAPAdType, AdStructure>();
var i = ad.ToList().GetEnumerator();
try {
while (i.MoveNext())
{
byte len = i.Current;
i.MoveNext();
byte type = i.Current; // len includes type and data
var data = new List <byte>();
for (var idx = 0; idx < len - 1; idx++)
{
i.MoveNext();
data.Add(i.Current);
}
var adStruct = new AdStructure {
Type = (GAPAdType)Enum.ToObject(typeof(GAPAdType), type),
Data = data.ToArray()
};
adStructDict.Add(adStruct.Type, adStruct);
}
} catch (Exception) {
Debug.WriteLine("Warning: Silenced an exception while parsing BLE ad - ill formatted BLE packet");
return(adStructDict);
}
finally {
i.Dispose();
}
return(adStructDict);
}
