public static async Task <IEnumerable <RestDevice> > Discover(int timeout = 7)
{
var tcs = new TaskCompletionSource <IEnumerable <RestDevice> >();
var rests = new Dictionary <ulong, RestDevice>();
var advertisements = new Dictionary <ulong, BluetoothLEAdvertisementReceivedEventArgs>();
var ble_watcher = new BluetoothLEAdvertisementWatcher
{
ScanningMode = BluetoothLEScanningMode.Active
};
ble_watcher.Received += (obj, adv) =>
{
// name is received in one advertisement, manufacturer data in a different one
if (!advertisements.ContainsKey(adv.BluetoothAddress))
{
advertisements[adv.BluetoothAddress] = adv;
}
// accumulate the required info in the cache
var cached = advertisements[adv.BluetoothAddress];
if (cached.Advertisement.LocalName == "" && adv.Advertisement.LocalName != "")
{
cached.Advertisement.LocalName = adv.Advertisement.LocalName;
}
if (cached.Advertisement.ManufacturerData.Count == 0 &&
adv.Advertisement.ManufacturerData.Count == 1)
{
cached.Advertisement.ManufacturerData.Add(adv.Advertisement.ManufacturerData[0]);
}
// check if the device is a Rest
if (IsRestAdvertisement(cached.Advertisement) && !rests.ContainsKey(cached.BluetoothAddress))
{
Dbg("discovered rest device: " + cached.BluetoothAddress.ToString("X"));
var rest = new RestDevice(cached.Advertisement.LocalName, cached.BluetoothAddress);
rests.Add(cached.BluetoothAddress, rest);
}
};
ble_watcher.Stopped += (obj, e) =>
{
Dbg("discovery complete");
tcs.SetResult(rests.Values);
};
ble_watcher.Start();
Dbg("starting discovery");
// wait until timeout
await Task.Delay(timeout * 1000);
ble_watcher.Stop();
return(await tcs.Task);
}
public static RestDeviceData FromBuffer(IBuffer buffer)
{
var retval = new RestDeviceData();
var data = new byte[buffer.Length];
DataReader.FromBuffer(buffer).ReadBytes(data);
//RestDevice.Dbg("manufacturer data: " + BitConverter.ToString(data));
int i = 0; // data index
while (i < data.Length)
{
switch (data[i])
{
case B_HEADER1:
case B_HEADER2:
// TODO: verify header
i += 3;
break;
case B_COLOR:
retval.Color = Color.FromArgb(data[i + 4], data[i + 1], data[i + 2], data[i + 3]);
i += 5;
break;
case B_EVENT_NEXT:
// TODO: parse next event
i += 6;
break;
case B_PRESET_POWER:
// TODO: parse preset
retval.Power = (data[i + 1] & 0b1100_0000) != 0b1100_0000;
i += 2;
break;
case B_AUDIO:
retval.AudioTrack = (AudioTrack)data[i + 1];
retval.Volume = data[i + 2];
i += 3;
break;
case B_TIME:
// TODO: parse time
i += 5;
break;
case B_EVENT_ACTIVE:
// TODO: parse active event
i += 2;
break;
case 0:
i += 1;
break;
default:
RestDevice.Dbg("unknown data id: " + data[i].ToString("X"));
i += 1;
break;
}
}
RestDevice.Dbg($"power:{retval.Power}, color:{retval.Color}, vol:{retval.Volume}, trk: {retval.AudioTrack}");
return(retval);
}
