/// <summary>
/// Sends Cctalk message to device and waits for answer.
/// </summary>
public CctalkMessage Send(CctalkMessage com, ICctalkChecksum chHandler)
{
// TODO: handle BUSY message
lock (_callSyncRoot)
{
Trace.TraceInformation("Sending message from {0} to {1}. Header={2}", com.SourceAddr, com.DestAddr, com.Header);
var msgBytes = com.GetTransferDataNoChecksumm();
chHandler.CalcAndApply(msgBytes);
//_respondChecksumChecker = chHandler;
_port.DiscardInBuffer();
_port.Write(msgBytes, 0, msgBytes.Length);
Trace.TraceInformation("Message sent, waiting for respond");
_port.ReadTimeout = RespondStartTimeout;
Int32 respondBufPos = 0;
CctalkMessage respond;
var echoRemover = 0;
while (true)
{
try
{
var b = (Byte)_port.ReadByte();
// after first respond package we wait fo rest respond packages with another timout
_port.ReadTimeout = RespondDataTimeout;
if (_removeEcho && (echoRemover < msgBytes.Length))
{
echoRemover++;
continue;
}
_respondBuf[respondBufPos] = b;
respondBufPos++;
var isRespondComplete = GenericCctalkDevice.IsRespondComplete(_respondBuf, respondBufPos);
if (isRespondComplete)
{
if (!chHandler.Check(_respondBuf, 0, respondBufPos))
{
var copy = new byte[respondBufPos];
Array.Copy(_respondBuf, copy, respondBufPos);
throw new InvalidRespondFormatException(copy, "Checksumm check fail");
}
respond = GenericCctalkDevice.ParseRespond(_respondBuf, 0, respondBufPos);
Array.Clear(_respondBuf, 0, _respondBuf.Length);
break;
}
}
catch (TimeoutException ex)
{
if (_port.ReadTimeout == RespondStartTimeout)
throw new TimeoutException("Device not respondng", ex);
var respondBufContents = new StringBuilder();
for (int i = 0; i > respondBufPos; i++)
{
respondBufContents.Append(_respondBuf[i].ToString("X"))
.Append(" ");
}
Trace.TraceInformation("Pause in reply error. Recive buffer contents {0} bytes: {1}", respondBufPos, respondBufContents);
Array.Clear(_respondBuf, 0, _respondBuf.Length);
throw new TimeoutException("Pause in reply (should reset all communication vatiables and be ready to recive the next message)", ex);
}
}
return respond;
/*
* When receiving bytes within a message packet, the communication software should
* wait up to 50ms for another byte if it is expected. If a timeout condition occurs, the
* software should reset all communication variables and be ready to receive the next
* message. No other action should be taken. (cctalk spec part1, 11.1)
*/
}
}
public CctalkMessage Send(CctalkMessage com, ICctalkChecksum checksumHandler)
{
throw new NotImplementedException();
}
public static CctalkMessage ParseMessage(Byte[] source, Int32 offset, Int32 length)
{
if (source == null)
throw new ArgumentNullException("source");
if (source.Length < offset + length)
throw new ArgumentException("offset or length are invalid");
if (length < CctalkMessage.MinMessageLength)
throw new ArgumentException("too small for message", "length");
//if (header != this.Header)
// throw new ArgumentException("invalid message type for this class", "source");
var dataLen = source[CctalkMessage.PosDataLen + offset];
if (dataLen + 5 != length)
throw new ArgumentException("invalid message data lengh", "source");
var ret = new CctalkMessage
{
Header = source[CctalkMessage.PosHeader + offset],
DestAddr = source[CctalkMessage.PosDestAddr + offset],
SourceAddr = source[CctalkMessage.PosSourceAddr + offset]
};
if (dataLen > 0)
{
ret.Data = new byte[dataLen];
Array.Copy(source, CctalkMessage.PosDataStart + offset, ret.Data, 0, dataLen);
}
return ret;
}
public InvalidRespondException(CctalkMessage respond, string message)
: base(message)
{
InvalidRespond = respond;
}
public InvalidRespondException(CctalkMessage respond)
: this(respond, "Invalid respond")
{
}
/// <summary>
/// Sends Cctalk message to device and waits for answer.
/// </summary>
public CctalkMessage Send(CctalkMessage com, ICctalkChecksum chHandler)
{
// TODO: handle BUSY message
lock (_callSyncRoot)
{
var msgBytes = com.GetTransferDataNoChecksumm();
chHandler.CalcAndApply(msgBytes);
//_respondChecksumChecker = chHandler;
_port.DiscardInBuffer();
_port.Write(msgBytes, 0, msgBytes.Length);
_port.ReadTimeout = RespondStartTimeout;
Int32 respondBufPos = 0;
CctalkMessage respond;
var echoRemover = 0;
while (true)
{
try
{
var b = (Byte)_port.ReadByte();
_port.ReadTimeout = RespondDataTimeout;
if (_removeEcho && (echoRemover < msgBytes.Length))
{
echoRemover++;
continue;
}
_respondBuf[respondBufPos] = b;
respondBufPos++;
var isRespondComplete = GenericCctalkDevice.IsRespondComplete(_respondBuf, respondBufPos);
if (isRespondComplete)
{
if (!chHandler.Check(_respondBuf, 0, respondBufPos))
{
var copy = new byte[respondBufPos];
Array.Copy(_respondBuf, copy, respondBufPos);
throw new InvalidRespondFormatException(copy, "Checksumm check fail");
}
respond = GenericCctalkDevice.ParseRespond(_respondBuf, 0, respondBufPos);
Array.Clear(_respondBuf, 0, _respondBuf.Length);
break;
}
}
catch (TimeoutException ex)
{
if (_port.ReadTimeout == RespondStartTimeout)
throw new TimeoutException("Device not respondng", ex);
throw new TimeoutException("Pause in reply (should reset all communication vatiables and be ready to recive the next message)", ex);
}
}
return respond;
/*
* When receiving bytes within a message packet, the communication software should
* wait up to 50ms for another byte if it is expected. If a timeout condition occurs, the
* software should reset all communication variables and be ready to receive the next
* message. No other action should be taken. (cctalk spec part1, 11.1)
*/
}
}
