private TimeSpan SCAN_INTERVAL_PRESENT = new TimeSpan(0, 30, 1); // Keep a multiple of this slightly longer than AWAY_TIMEOUT to prevent evaulating 1sec before the timeout.
#endregion Fields
#region Constructors
public BluetoothService(ServiceCreationInfo info)
: base("bluetooth", info)
{
mBluetooth = new BluetoothHelper();
// Refresh available devices
mBluetooth.RefreshDevices();
mDeviceNames = mBluetooth.GetDevices();
Log.Info("Bluetooth devices: {0}", mDeviceNames);
// Set up scan thread.
mEvents = new EventWaitHandle[] { mStopEvent, mDeviceEvent };
mThread = new Thread(_searchThread);
mThread.Start();
}
public BluetoothService(ServiceCreationInfo info)
: base("bluetooth", info)
{
mBluetooth = new BluetoothHelper();
// Refresh available devices
mBluetooth.RefreshDevices();
mDeviceNames = mBluetooth.GetDevices();
if (mDeviceNames != null)
{
Log.Info("Bluetooth devices: {0}", mDeviceNames);
}
// Set up scan thread.
mEvents = new EventWaitHandle[] { mStopEvent, mDeviceEvent };
mThread = new Thread(_searchThread);
mThread.Start();
}
private void _searchThread()
{
Log.Info("Starting Bluetooth search thread");
// Avoid the initial lock contestion for mDevices
Thread.Sleep(5000);
DateTime intensiveScanTime = DateTime.Now;
while (mRunning)
{
try
{
mBluetooth.RefreshDevices();
DateTime currTime = DateTime.Now;
DateTime nextScan = currTime + new TimeSpan(10, 0, 0); // Just some high dummy value to diff against
if (mIntensiveScan)
{
Log.Debug("Starting intensive scan");
mIntensiveScan = false;
intensiveScanTime = currTime + INTENSIVE_SCAN_DURATION;
}
lock (mDevices)
{
foreach (var info in mDevices)
{
string btName = info.Device.BtName;
BluetoothDevice device = info.Device;
// Scan for device
mBluetooth.UpdateDevice(btName);
bool inRange = mBluetooth.InRange(btName);
// Update last time device was seen.
if (inRange)
{
info.LastTime = currTime;
}
// Initial notify to set up device state properly, but don't notify it's listeners
if (info.FirstScan)
{
info.FirstScan = false;
// Notify device of it's initial state.
if (inRange)
{
Log.Info("Bluetooth: device {0} initially present", btName);
}
else
{
Log.Info("Bluetooth: device {0} initially away", btName);
}
device.OnStatusUpdate(inRange, true);
}
else if (device.InRange && !inRange && (currTime - info.LastTime) >= AWAY_TIMEOUT)
{
// Lost device
Log.Debug("Lost device: {0}", btName);
info.Device.OnStatusUpdate(inRange);
}
else if (!device.InRange && inRange)
{
// Found device
Log.Debug("Found device: {0}", btName);
info.Device.OnStatusUpdate(inRange);
}
TimeSpan delayTime;
// Delay dependent on current state
if (device.InRange)
{
delayTime = SCAN_INTERVAL_PRESENT;
}
else
{
delayTime = SCAN_INTERVAL_AWAY;
}
info.NextScan = currTime + delayTime;
if (info.NextScan < nextScan)
{
nextScan = info.NextScan;
}
}
}
// Running intensive scan so don't sleep just yet.
if (currTime < intensiveScanTime)
{
continue;
}
EventWaitHandle.WaitAny(mEvents, nextScan - currTime);
}
catch (Exception e)
{
Logging.Log.Exception(e);
}
}
}