public byte[] Send(IDeviceMessage message)
{
byte[] buffer = message.GetSendBuffer();
Connect();
try {
for (int i = 0; i < 3; i++)
{
_stream.WriteAsync(buffer, 0, buffer.Length).Wait();
var rvalue = _stream.GetTerminalResponseAsync();
if (rvalue != null)
{
byte lrc = rvalue[rvalue.Length - 1]; // Should be the LRC
if (lrc != TerminalUtilities.CalculateLRC(rvalue))
{
SendControlCode(ControlCodes.NAK);
}
else
{
SendControlCode(ControlCodes.ACK);
return(rvalue);
}
}
}
throw new MessageException("Terminal did not respond in the given timeout.");
}
catch (Exception exc) {
throw new MessageException(exc.Message, exc);
}
finally {
OnMessageSent?.Invoke(message.ToString());
Disconnect();
}
}
public byte[] Send(IDeviceMessage message)
{
byte[] buffer = message.GetSendBuffer();
var readyReceived = false;
byte[] responseMessage = null;
Connect();
try {
var task = _stream.WriteAsync(buffer, 0, buffer.Length);
if (!task.Wait(_settings.Timeout))
{
throw new MessageException("Terminal did not respond in the given timeout.");
}
do
{
var rvalue = _stream.GetTerminalResponseAsync();
if (rvalue != null)
{
var msgValue = GetResponseMessageType(rvalue);
switch (msgValue)
{
case UpaMessageType.Ack:
break;
case UpaMessageType.Nak:
break;
case UpaMessageType.Ready:
readyReceived = true;
break;
case UpaMessageType.Busy:
break;
case UpaMessageType.TimeOut:
break;
case UpaMessageType.Msg:
responseMessage = TrimResponse(rvalue);
if (IsNonReadyResponse(responseMessage))
{
readyReceived = true; // since reboot doesn't return READY
}
SendAckMessageToDevice();
break;
default:
throw new Exception("Message field value is unknown in API response.");
}
}
else
{
// Reset the connection before the next attempt
Disconnect();
Connect();
}
} while (!readyReceived);
return(responseMessage);
}
catch (Exception exc) {
throw new MessageException(exc.Message, exc);
}
finally {
OnMessageSent?.Invoke(message.ToString());
Disconnect();
}
}
