public void Scan(CancellationToken scanToken, CancellationToken appToken, int scanTimeoutInMilliseconds,
Action <BgBleDevice> processDevices)
{
try
{
var lockTaken = false;
Monitor.TryEnter(ThreadLock, 150, ref lockTaken);
if (lockTaken)
{
if (_busy)
{
return;
}
_busy = true;
Monitor.Exit(ThreadLock);
}
_deviceNotifications = processDevices;
_bglib.SendCommand(_serialPort, _bglib.BLECommandGAPSetScanParameters(0xC8, 0xC8, 1));
_bglib.SendCommand(_serialPort, _bglib.BLECommandGAPDiscover(1));
WaitHandle.WaitAny(new[] { scanToken.WaitHandle }, scanTimeoutInMilliseconds);
// cleanup takes 125ms
_bglib.SendCommand(_serialPort, _bglib.BLECommandGAPEndProcedure());
_deviceNotifications = null;
WaitHandle.WaitAny(new[] { appToken.WaitHandle }, 130);
}
catch (Exception exception)
{
_logger.LogWarning(exception,
$"ControlPlus Repository: Unable to scan via Com port {_serialPort.PortName}");
}
_busy = false;
}
/// <summary>
/// Start device discovery
/// </summary>
public void StartDeviceDiscovery()
{
_logger?.LogDebug("Start device discovery");
_bgLib.BLEEventGAPScanResponse += OnScanResponse;
_bgLib.SendCommand(_bleModuleConnection.SerialPort, _bgLib.BLECommandGAPSetScanParameters(0xC8, 0xC8, 1));
_bgLib.SendCommand(_bleModuleConnection.SerialPort, _bgLib.BLECommandGAPDiscover(1));
}
public async Task GAPSetScanParametersAsync(int scanIntervalMs, int scanWindowMs, bool activeScanningEnabled)
{
const int TIMEOUT_MS = 6000;
var scanInt = (ushort)ConvertMsTo625UsUnits(scanIntervalMs);
var scanWin = (ushort)ConvertMsTo625UsUnits(scanWindowMs);
byte activeScan = activeScanningEnabled ? (byte)1 : (byte)0;
var cmd = _bglib.BLECommandGAPSetScanParameters(scanInt, scanWin, activeScan);
await _bglib.SendCommandAsync(cmd).ConfigureAwait(false);
using (var cts = new CancellationTokenSource(TIMEOUT_MS)) {
bool didTimeout = false;
try { await _cmdRespWaitHandle.WaitAsync(cts.Token).ConfigureAwait(false); }
catch (OperationCanceledException) { didTimeout = true; }
if (didTimeout)
{
throw new TimeoutException();
}
}
if (_lastResult == 0)
{
return;
}
var error = (BGErrorCode)Enum.ToObject(typeof(BGErrorCode), _lastResult);
// Continue on if this error is received. Happens at times but not critical error
if (error == BGErrorCode.DeviceInWrongState)
{
Debug.WriteLine($"Warning: GAPSetScanParameters returned: error={error}");
return;
}
string errMsg = $"GAPSetScanParameters returned: error={error} code={_lastResult:X4}";
throw new Exception(errMsg);
}
