public void Beacon_ParseDataWithoutFlags()
{
var data = new byte[] {
0x00, 0x00, 0x28, 0xEA, 0x6B, 0xB8, 0x5F, 0xD0, 0x1B, 0x1A, 0xFF, 0x4C, 0x00, 0x02, 0x15,
0xA4, 0x95, 0x00, 0x00, 0xC5, 0xB1, 0x4B, 0x44, 0xB5, 0x12, 0x13, 0x70, 0xF0, 0x2D, 0x74,
0xDE, 0x00, 0x02, 0x6D, 0x65, 0xC5, 0xBC
};
var queue = new Queue <byte>(data);
var beacon = Beacon.Parse(LeAdvertisingEvent.Parse(queue));
Assert.NotNull(beacon);
Assert.AreEqual(0x4C00, beacon.CompanyId);
Assert.AreEqual(-59, beacon.CalibratedTxPower);
}
/// <summary>
/// Parse low energy advertising event to a beacon instance.
/// </summary>
/// <param name="e">The event.</param>
/// <returns>The beacon or null in case of failure.</returns>
internal static Beacon Parse(LeAdvertisingEvent e)
{
if (e.EventType == LeAdvertisingEventType.ScanRsp)
{
return(null);
}
var payload = new Queue <byte>(e.Payload);
while (payload.Count > 0)
{
var adLength = payload.Dequeue();
if (payload.Count < adLength)
{
break;
}
var adType = payload.Dequeue();
if (adType == 0xFF && adLength >= 26)
{
var companyId = (ushort)((payload.Dequeue() << 8) + payload.Dequeue());
var b0advInd = payload.Dequeue();
var b1advInd = payload.Dequeue();
var uuid = payload.Dequeue(16);
var major = (ushort)((payload.Dequeue() << 8) + payload.Dequeue());
var minor = (ushort)((payload.Dequeue() << 8) + payload.Dequeue());
var txPower = (sbyte)payload.Dequeue();
return(new Beacon
{
Uuid = uuid.ToLittleEndianFormattedUuidString(),
Address = e.Address,
Major = major,
Minor = minor,
Rssi = e.Rssi,
CalibratedTxPower = txPower,
CompanyId = companyId
});
}
else
{
if (adLength > 0)
{
payload.Dequeue(adLength - 1);
}
}
}
return(null);
}
public void Beacon_ParseDataWithFlags()
{
var data = new byte[] {
0x00, 0x00, 0xBC, 0x9A, 0x78, 0x56, 0x34, 0x12, 0x1E, 0x02, 0x01, 0x1A, 0x1A, 0xFF, 0xAA,
0xBB, 0x02, 0x15, 0x4F, 0xE5, 0xD5, 0xF6, 0xAB, 0xCE, 0xDD, 0xFE, 0x15, 0x87, 0x12, 0x3D,
0x1A, 0x4B, 0x56, 0x7F, 0x04, 0xD2, 0x16, 0x2E, 0xD0, 0xCC
};
var queue = new Queue <byte>(data);
var beacon = Beacon.Parse(LeAdvertisingEvent.Parse(queue));
Assert.AreEqual(new byte[] { 0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC }, beacon.Address);
Assert.AreEqual("4fe5d5f6-abce-ddfe-1587-123d1a4b567f", beacon.Uuid);
Assert.AreEqual(1234, beacon.Major);
Assert.AreEqual(5678, beacon.Minor);
Assert.AreEqual(-48, beacon.CalibratedTxPower);
Assert.AreEqual(0xAABB, beacon.CompanyId);
Assert.AreEqual(-52, beacon.Rssi);
Assert.IsFalse(beacon.IsAppleIBeacon);
}
/// <summary>
/// Parse low energy advertising event to a beacon instance.
/// </summary>
/// <param name="e">The event.</param>
/// <returns>The beacon or null in case of failure.</returns>
internal static Beacon Parse(LeAdvertisingEvent e)
{
if (e.EventType == LeAdvertisingEventType.ScanRsp)
{
return(null);
}
if (e.Payload.Length < 9)
{
return(null);
}
var payload = new Queue <byte>(e.Payload);
var ad1Length = payload.Dequeue();
var ad1Type = payload.Dequeue();
var flags = payload.Dequeue();
var ad2Length = payload.Dequeue();
var ad2Type = payload.Dequeue();
var companyId = (ushort)((payload.Dequeue() << 8) + payload.Dequeue());
var b0advInd = payload.Dequeue();
var b1advInd = payload.Dequeue();
if (ad1Length != 2 || ad1Type != 0x01 || ad2Length < 26 || ad2Type != 0xFF)
{
return(null);
}
var uuid = payload.Dequeue(16);
var major = (ushort)((payload.Dequeue() << 8) + payload.Dequeue());
var minor = (ushort)((payload.Dequeue() << 8) + payload.Dequeue());
var txPower = (sbyte)payload.Dequeue();
return(new Beacon
{
Uuid = uuid.ToLittleEndianFormattedUuidString(),
Address = e.Address,
Major = major,
Minor = minor,
Rssi = e.Rssi,
CalibratedTxPower = txPower,
CompanyId = companyId
});
}
public void Beacon_Parse()
{
var address = new byte[] { 0x12, 0x34, 0x56, 0x78, 0x9A, 0xBC };
var queue = new Queue <byte>();
queue.Enqueue(0x00);
queue.Enqueue(0x00);
queue.Enqueue(address.Reverse());
queue.Enqueue((byte)data.Length);
queue.Enqueue(data);
unchecked { queue.Enqueue((byte)-52); }
var beacon = Beacon.Parse(LeAdvertisingEvent.Parse(queue));
Assert.AreEqual(address, beacon.Address);
Assert.AreEqual("4fe5d5f6-abce-ddfe-1587-123d1a4b567f", beacon.Uuid);
Assert.AreEqual(1234, beacon.Major);
Assert.AreEqual(5678, beacon.Minor);
Assert.AreEqual(-48, beacon.CalibratedTxPower);
Assert.AreEqual(0xAABB, beacon.CompanyId);
Assert.AreEqual(-52, beacon.Rssi);
Assert.IsFalse(beacon.IsAppleIBeacon);
}
/// <summary>
/// Parses an incoming <see cref="LeAdvertisingEvent"/> for Eddystone frames.
/// </summary>
/// <param name="e">The incoming event frame.</param>
/// <returns>An <see cref="Eddystone"/> instance or null in case the event could not be parsed as an Eddystone event.</returns>
/// <remarks>Implemented according to https://github.com/google/eddystone/blob/master/protocol-specification.md </remarks>
internal static Eddystone Parse(LeAdvertisingEvent e)
{
if (e.EventType == LeAdvertisingEventType.ScanRsp)
{
return(null);
}
var payload = new Queue <byte>(e.Payload);
// Skip flags
var flagsLength = payload.Dequeue();
payload.Dequeue(flagsLength);
// Extract and verify Eddystone UUID
// The Complete List of 16-bit Service UUIDs as defined in The Bluetooth Core Specification Supplement (CSS) v5, Part A, § 1.1.
// The Complete List of 16-bit Service UUIDs must contain the Eddystone Service UUID of 0xFEAA. This is included to allow background scanning on iOS devices.
var eddystoneUuidLength = payload.Dequeue();
if (eddystoneUuidLength != 3)
{
return(null);
}
payload.Dequeue();
var eddystoneUuid = (ushort)((payload.Dequeue() << 8) + payload.Dequeue());
if (eddystoneUuid != 0xAAFE)
{
return(null);
}
// Extract service data
// The Service Data data type, Ibid., § 1.11.
// The Service Data - 16 bit UUID data type must be the Eddystone Service UUID of 0xFEAA
var serviceDataLength = payload.Dequeue();
var serviceDataTypeValue = payload.Dequeue();
eddystoneUuid = (ushort)((payload.Dequeue() << 8) + payload.Dequeue());
if (eddystoneUuid != 0xAAFE)
{
return(null);
}
var eddystoneFrameType = (EddystoneFrameType)payload.Dequeue();
Eddystone result = null;
switch (eddystoneFrameType)
{
case EddystoneFrameType.Uid:
result = EddystoneUid.ParseFrame(payload);
break;
case EddystoneFrameType.Url:
result = EddystoneUrl.ParseFrame(payload);
break;
case EddystoneFrameType.Tlm:
result = EddystoneTlm.ParseFrame(payload);
break;
case EddystoneFrameType.Eid:
result = EddystoneEid.ParseFrame(payload);
break;
}
if (result != null)
{
result.Address = e.Address;
result.Rssi = e.Rssi;
}
return(result);
}
