protected virtual byte?ResolveMode <T>()
where T : class, IOBDData
{
if (!ModeCache.TryGetValue(typeof(T), out byte?mode))
{
mode = AddToModeCache <T>();
}
return(mode);
}
protected override object ProcessMessage(string message)
{
if (message == null)
{
return(null);
}
DateTime timestamp = DateTime.Now;
RawDataReceived?.Invoke(this, new RawDataReceivedEventArgs(message, timestamp));
if (message.ToUpper() == "CAN ERROR")
{
CanError?.Invoke(this, new CanErrorEventArgs {
Message = message
});
}
else if (message.Length > 4)
{
// DarthAffe 15.08.2020: Splitted messages are prefixed with 0: (first chunk) and 1: (second chunk)
// DarthAffe 15.08.2020: They also seem to be always preceded by a '009'-message, but since that's to short to be processed it should be safe to ignore.
// DarthAffe 15.08.2020: Since that behavior isn't really documented (at least I wasn't able to find it) that's all trial and error and might not work for all pids with long results.
if (message[1] == ':')
{
if (message[0] == '0')
{
MessageChunk = message.Substring(2, message.Length - 2);
}
else if (message[0] == '1')
{
string fullMessage = MessageChunk + message.Substring(2, message.Length - 2);
MessageChunk = null;
return(ProcessMessage(fullMessage));
}
}
else
{
string resModeStr = message.Substring(0, 2);
try
{
byte resMode = Convert.ToByte(resModeStr, 16);
if (resMode == GetModeByte() + 0x40 || ModeCache.ContainsValue((byte)(resMode - 0x40)))
{
byte pid = (byte)message.Substring(2, 2).GetHexVal();
int longPid = message.Substring(2, 4).GetHexVal();
if (DataTypeCache.TryGetValue(longPid, out Type dataType) || DataTypeCache.TryGetValue(pid, out dataType))
{
if (ModeCache.TryGetValue(dataType, out var modeByte) && (modeByte ?? GetModeByte()) != resMode - 0x40)
{
// Mode didn't match PID
return(null);
}
IOBDData obdData = (IOBDData)Activator.CreateInstance(dataType);
bool isLong = obdData.PID == longPid;
int start = isLong ? 6 : 4;
obdData.Load(message.Substring(start, message.Length - start));
if (DataReceivedEventHandlers.TryGetValue(dataType, out IDataEventManager dataEventManager))
{
dataEventManager.RaiseEvent(this, obdData, timestamp);
}
if (DataReceivedEventHandlers.TryGetValue(typeof(IOBDData), out IDataEventManager genericDataEventManager))
{
genericDataEventManager.RaiseEvent(this, obdData, timestamp);
}
return(obdData);
}
}
}
catch (FormatException)
{
// Ignore format exceptions from convert
}
}
}
return(null);
}