public void OpenSerialPort()
{
_atListenThread = new Thread(ReadDataLoop);
BaseSerialPort.Open();
BaseSerialPort.Encoding = Encoding.UTF8; //technically, this should be GSM but whatever
_atListenThread.Start();
}
private void ReadDataLoop()
{
while (!RequestCancel)
{
var s = new StringBuilder();
var binaryWriteSignal = false;
while (true)
{
if (RequestCancel)
{
return;
}
var c = BaseSerialPort.ReadByte(); //this will block the thread until it reads something.
if (c > char.MaxValue)
{
logger.LogError("Read character from serial port that exceeded max char value!");
continue;
}
if (c < 0)
{
break; //means we couldn't read
}
if (c == '>') //we hit an input thing, need to signal to start writing.
{
logger.LogInformation("Received binary start symbol");
binaryWriteSignal = true;
break;
}
if (c == ResponseFormattingCharacter)
{
break;
}
s.Append((char)c);
}
if (binaryWriteSignal)
{
//TODO: start signal
if (CurrentBinaryWriteTask == null)
{
logger.LogWarning("Received binary write indicator but no binary write task existed!");
//throw new Exception("Binary write task was null but received start character!");
continue;
}
CurrentBinaryWriteTask.SetResult(true);
continue;
}
logger.LogInformation("Received serial line: " + s.ToString().Replace("\n", "<LN>").Replace("\r", "<CR>"));
var line = s.ToString().Trim();
if (string.IsNullOrEmpty(line))
{
continue;
}
if (line.StartsWith("AT+"))
{
continue; //means that we are receiving what we sent (echo)
}
if (line == "OK" || line == "ERROR")
{
if (CurrentBinaryWriteTask != null)
{
CurrentBinaryWriteTask.SetResult(false);
}
else
{
try
{
AtCommandResultQueue.First.Value.SetResult(new CommandResult(line switch
{
"OK" => ATCommandResultCode.OK,
"ERROR" => ATCommandResultCode.Error
}));
}
public void CloseSerialPort()
{
BaseSerialPort.Close();
}
