public async Task <string> CommandGetVariable(string propertyName)
{
if (_UARTService == null || !_UARTService.IsDeviceReady)
{
return(string.Empty);
}
//Generate package
DataPacket packetToSend = new GetPropertyDataPacket(propertyName);
//Timeout handling
TaskCompletionSource <DataPacket> signalEventPoke = new TaskCompletionSource <DataPacket>();
UARTPacketEventHandler handler = null;
handler += (sender, e) =>
{
if (e.ResponsePacket.MessageId == packetToSend.MessageId)
{
signalEventPoke.SetResult(e.ResponsePacket);
_UARTService.UARTPacketReceived -= handler;
}
};
_UARTService.UARTPacketReceived += handler;
if (await _UARTService.SendPacket(packetToSend))
{
SendPropertyDataPacket reception = await TimeoutAsyncEvent.TimeoutAfter(signalEventPoke.Task, TIMEOUT_UART_ANSWER) as SendPropertyDataPacket;
_UARTService.UARTPacketReceived -= handler;
if (reception != null)
{
await CommandConfirmVariable(reception.MessageId, reception.PropertyName);
}
return(reception?.PropertyValue);
}
else
{
//TODO LOG Log.Error("PokeAliveCommand failed.");
_UARTService.UARTPacketReceived -= handler;
}
return(string.Empty);
}
private async void Event_UARTPacketReceived(object sender, UARTPacketEventArgs e)
{
if (e.ResponsePacket.Source != DataSource.FourByFour)
{
return;
}
switch (e.ResponsePacket.Command)
{
//Automatically send a pong answer
case FourByFourConstants.CMD_PING:
await CommandSendPong(e.ResponsePacket.MessageId);
break;
//Automatically send a confirmation
case FourByFourConstants.CMD_SEND_PROPERTY:
SendPropertyDataPacket sendValueDataPacket = e.ResponsePacket as SendPropertyDataPacket;
if (sendValueDataPacket != null)
{
NewResponseVariableChangedReceived(sendValueDataPacket.PropertyName, sendValueDataPacket.PropertyValue);
await CommandConfirmVariable(e.ResponsePacket.MessageId, sendValueDataPacket.PropertyName);
}
break;
//A confirm action is part of the CommandSendVariable
case FourByFourConstants.CMD_CONFIRM_PROPERTY:
//A confirm action is part of the CommandLaunchAction
case FourByFourConstants.CMD_CONFIRM_ACTION:
//A pong command will never be sent on its own.
case FourByFourConstants.CMD_PONG:
//4x4 will never get data from the UI.
case FourByFourConstants.CMD_GET_PROPERTY:
//4x4 will never launch an action on the UI, it's the other way around.
case FourByFourConstants.CMD_LAUNCH_ACTION:
break;
}
}
