private async void AnalyzeReceivedData()
{
try {
var headerBuffer = new byte[2];
while (_readData)
{
// Pay@Table functionalities handling.
if (_settings.ConnectionMode.Equals(ConnectionModes.PAY_AT_TABLE))
{
byte[] buffer = new byte[8192];
int bytesReceived = _stream.ReadAsync(buffer, 0, buffer.Length).Result;
if (bytesReceived > 0)
{
byte[] readBuffer = buffer.SubArray(0, bytesReceived);
string raw = Encoding.UTF8.GetString(readBuffer);
string dataETX = raw.Substring(1, raw.Length - 2);
byte[] bufferLRC = TerminalUtilities.CalculateLRC(raw.Substring(raw.Length - 1));
string receivedLRC = BitConverter.ToString(bufferLRC);
byte[] calculateLRC = TerminalUtilities.CalculateLRC(dataETX);
string calculatedLRC = BitConverter.ToString(calculateLRC);
if (receivedLRC.Equals(calculatedLRC))
{
string data = raw.Substring(1, raw.Length - 3);
byte[] patRequest = Encoding.UTF8.GetBytes(data);
OnPayAtTableRequest?.Invoke(new PATRequest(patRequest));
}
}
}
else
{
// Standard functionalities handling
_stream.Read(headerBuffer, 0, headerBuffer.Length);
if (!_readData)
{
throw new Exception();
}
int dataLength = await Task.Run(() => TerminalUtilities.HeaderLength(headerBuffer));
if (dataLength > 0)
{
byte[] dataBuffer = new byte[dataLength];
var incomplete = true;
int offset = 0;
int tempLength = dataLength;
do
{
// Read data
int bytesReceived = _stream.Read(dataBuffer, offset, tempLength);
if (!_readData)
{
throw new Exception();
}
if (bytesReceived != tempLength)
{
offset += bytesReceived;
tempLength -= bytesReceived;
}
else
{
incomplete = false;
}
} while (incomplete);
var readBuffer = new byte[dataLength];
Array.Copy(dataBuffer, readBuffer, dataLength);
if (isBroadcast(readBuffer))
{
_broadcastMessage = new BroadcastMessage(readBuffer);
OnBroadcastMessage?.Invoke(_broadcastMessage.Code, _broadcastMessage.Message);
}
else if (isKeepAlive(readBuffer) && INGENICO_GLOBALS.KeepAlive)
{
_isKeepAlive = true;
if (_isKeepAlive && !_isKeepAliveRunning)
{
_stream.ReadTimeout = _settings.Timeout;
_isKeepAliveRunning = true;
}
var keepAliveRep = KeepAliveResponse(readBuffer);
_stream.WriteAsync(keepAliveRep, 0, keepAliveRep.Length).Wait();
}
else // Receiving request response data.
{
_termResponse = readBuffer;
}
}
else
{
_receivingException = new ApiException("No data received.");
}
}
}
} catch (Exception ex) {
if (_settings.ConnectionMode != ConnectionModes.PAY_AT_TABLE)
{
if (_isResponseNeeded || _isKeepAlive)
{
_receivingException = ex;
_stream.ReadTimeout = -1;
_isKeepAlive = false;
}
if (_readData)
{
AnalyzeReceivedData();
}
else
{
_disposable = true;
}
}
}
}
private async Task <bool> WriteMessage(IDeviceMessage message)
{
return(await Task.Run(() => {
try {
int enquiryCount = 0;
_messageResponse = new List <byte>();
if (_serialPort == null)
{
return false;
}
do
{
_serialPort.Write(BitConverter.GetBytes((char)ControlCodes.ENQ), 0, 1);
if (!_isAcknowledge)
{
Thread.Sleep(1000);
_serialPort.Write(BitConverter.GetBytes((char)ControlCodes.EOT), 0, 1);
enquiryCount++;
if (enquiryCount.Equals(3))
{
throw new MessageException("Terminal did not respond in enquiry for three (3) times. Send aborted.");
}
}
else
{
do
{
byte[] msg = message.GetSendBuffer();
foreach (byte b in msg)
{
byte[] _b = new byte[] { b };
_serialPort.Write(_b, 0, 1);
}
if (_isAcknowledge)
{
_serialPort.Write(BitConverter.GetBytes((char)ControlCodes.EOT), 0, 1);
_isAcknowledge = false;
break;
}
} while (true);
do
{
Thread.Sleep(100);
if (_isBroadcast)
{
byte[] bMsg = Encoding.ASCII.GetBytes(_bufferReceived);
BroadcastMessage broadcastMsg = new BroadcastMessage(bMsg);
OnBroadcastMessage?.Invoke(broadcastMsg.Code, broadcastMsg.Message);
_isBroadcast = false;
}
if (_isXML)
{
while (!_transComplete)
{
if (_report.ToString().Contains(INGENICO_RESP.ENDXML))
{
string xmlData = _report.ToString().Substring(1, _report.ToString().Length - 3);
if (MessageReceived(xmlData))
{
_serialPort.Write(BitConverter.GetBytes((char)ControlCodes.ACK), 0, 1);
_report = new StringBuilder();
_isXML = false;
_transComplete = true;
}
}
else
{
_report.Append(_bufferReceived);
}
Thread.Sleep(0500);
}
;
}
if (_isResult)
{
string check = Encoding.UTF8.GetString(message.GetSendBuffer());
string refNumber = check.Substring(0, 2);
if (_bufferReceived.Contains(refNumber))
{
do
{
string responseData = _bufferReceived.Substring(1, _bufferReceived.Length - 3);
string actualReceived = _bufferReceived.Substring(1, _bufferReceived.Length - 3);
bool validateLRC = ValidateResponseLRC(responseData, actualReceived);
if (validateLRC)
{
if (MessageReceived(responseData))
{
_serialPort.Write(BitConverter.GetBytes((char)ControlCodes.ACK), 0, 1);
_isResult = false;
_transComplete = true;
}
}
} while (!_transComplete);
}
}
} while (!_transComplete);
return _transComplete;
}
} while (true);
} catch (ApiException e) {
throw new ApiException(e.Message);
}
}));
}