private void controller_LeMetaEventReceived(object sender, LeMetaEventReceivedEventArgs e)
{
if (e.LeMetaEvent == null)
{
return;
}
if (e.LeMetaEvent.SubEvent != LeMetaEvent.LeMetaSubEvent.AdvertisingReport)
{
return;
}
if (e.LeMetaEvent.AdvertisingEvents == null)
{
return;
}
foreach (var advertisingEvent in e.LeMetaEvent.AdvertisingEvents)
{
var beacon = Beacon.Parse(advertisingEvent);
if (beacon != null)
{
BeaconDetected?.Invoke(this, new BeaconEventArgs(beacon));
continue;
}
var eddystone = Eddystone.Parse(advertisingEvent);
if (eddystone != null)
{
EddystoneDetected?.Invoke(this, new EddystoneEventArgs(eddystone));
continue;
}
}
}
/// <summary>
/// Enable advertising as an Eddystone.
/// </summary>
/// <param name="eddystone">The Eddystone to emulate.</param>
/// <param name="advertisingInterval">The advertising interval. Interval should be between 20 ms and 10.24 seconds. Defaults to 1.28 seconds.</param>
public void EnableAdvertising(Eddystone eddystone, TimeSpan?advertisingInterval = null)
{
throw new NotImplementedException();
}
/// <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);
}
internal EddystoneEventArgs(Eddystone eddystone)
{
Eddystone = eddystone;
}