/// <summary>
/// Ensures connection status. Connects device if necessary.
/// </summary>
public override void EnsureConnection()
{
// Stop scan if device gets connected
EEDeviceManagerFactory.DeviceManager.StopScan();
if (_bleDevice != null && !_bleDevice.IsConnected())
{
bool success = Task.Run(async() =>
{
_bleDevice.Connect(new ConnectionConfig {
AutoConnect = true, AndroidConnectionPriority = ConnectionPriority.High
});
// Change MTU size to at least 256 bytes otherwise protocol might not work
int mtu = await _bleDevice.RequestMtu(256);
if (mtu < 256)
{
Diagnostic.Msg(1, "EnsureConnection", "Unable to set MTU size to 256. Communication might not work correctly.");
}
else
{
Diagnostic.Msg(1, "EnsureConnection", "Set MTU size to " + mtu);
}
int loopCnt = 0;
while (loopCnt < 100 && !_bleDevice.IsConnected())
{
loopCnt++;
await Task.Delay(100);
}
if (!_bleDevice.IsConnected())
{
// Could not connect to device
return(false);
}
await _bleDevice.DiscoverServices();
// Check rx Characteristic for notification or indication
IGattCharacteristic rxCharacteristic = await _bleDevice.GetCharacteristicsForService(ServiceUuid)
.FirstOrDefaultAsync(x => x.Uuid == RxCharacteristicUuid);
if (!rxCharacteristic.CanNotifyOrIndicate())
{
return(false);
}
// Enable notification/indication on device
await rxCharacteristic.EnableNotifications(true);
rxCharacteristic.WhenNotificationReceived().Subscribe(result =>
{
_stopWatch.Stop();
lock (_lockDebugInfo)
{
if (_responseTimeMs.Count >= 1000)
{
_responseTimeMs.RemoveAt(0);
}
_responseTimeMs.Add(_stopWatch.ElapsedMilliseconds);
}
foreach (byte b in result.Data)
{
_queueRx.Enqueue(b);
}
});
return(_bleDevice.IsConnected());
}).Result;
Connected = success;
if (!success)
{
// Could not connect to device
Diagnostic.Msg(1, "EnsureConnection", "Could not connect to device");
return;
}
else
{
// Need to send DIAS to keep connection open
var ee31 = new Protocol.EE31Protocol(this);
IEECommandResult result = ee31.ExecuteCommand(EE31Command.Discovery,
new DiscoveryCmdParams(DiscoveryCmdParams.BuildNewDiscoveryId(), 0, 20, 500, 0xAF));
if (result.Code != EECmdResultCode.Success)
{
Diagnostic.Msg(1, "EnsureConnection", "Failed to send DIAS command (" + result.Code.ToString() + ")");
}
}
}
_cmdTx = 0x0;
while (!_queueRx.IsEmpty)
{
_queueRx.TryDequeue(out byte dummy);
}
}