private bool WaitForGreeting(int timeout)
{
if (m_port == null)
{
return(false);
}
byte[] buffer = new byte[7];
int offset = 0;
int current_timeout;
while (offset < 7)
{
if (offset == 0)
{
current_timeout = timeout;
}
else
{
current_timeout = T_FRAME_ABORT;
}
int rx = m_port.Read(buffer, offset, 7 - offset, current_timeout);
if (rx <= 0)
{
return(false);
}
offset += rx;
//remove garbage
RemoveGreetingGarbage(buffer, ref offset);
}
return(true);
}
private bool WaitForGreeting(int timeout)
{
if (_port == null)
{
return(false);
}
var buffer = new byte[7];
var offset = 0;
while (offset < 7)
{
var currentTimeout = offset == 0 ? timeout : T_FRAME_ABORT;
var rx = _port.Read(buffer, offset, 7 - offset, currentTimeout);
if (rx <= 0)
{
return(false);
}
offset += rx;
//remove garbage
RemoveGreetingGarbage(buffer, ref offset);
}
return(true);
}
private GetMessageStatus GetNextMessage(int timeoutMs, out BacnetMstpFrameTypes frameType,
out byte destinationAddress, out byte sourceAddress, out int msgLength)
{
int timeout;
frameType = BacnetMstpFrameTypes.FRAME_TYPE_TOKEN;
destinationAddress = 0;
sourceAddress = 0;
msgLength = 0;
//fetch header
while (_localOffset < MSTP.MSTP_HEADER_LENGTH)
{
if (_port == null)
{
return(GetMessageStatus.ConnectionClose);
}
timeout = _localOffset > 0
? T_FRAME_ABORT // set sub timeout
: timeoutMs; // set big silence timeout
//read
var rx = _port.Read(_localBuffer, _localOffset, MSTP.MSTP_HEADER_LENGTH - _localOffset, timeout);
if (rx == -ETIMEDOUT)
{
//drop message
var status = _localOffset == 0 ? GetMessageStatus.Timeout : GetMessageStatus.SubTimeout;
_localBuffer[0] = 0xFF;
RemoveGarbage();
return(status);
}
if (rx < 0)
{
//drop message
_localBuffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.ConnectionError);
}
if (rx == 0)
{
//drop message
_localBuffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.ConnectionClose);
}
_localOffset += rx;
//remove paddings & garbage
RemoveGarbage();
}
//decode
if (MSTP.Decode(_localBuffer, 0, _localOffset, out frameType, out destinationAddress,
out sourceAddress, out msgLength) < 0)
{
//drop message
_localBuffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.DecodeError);
}
//valid length?
var fullMsgLength = msgLength + MSTP.MSTP_HEADER_LENGTH + (msgLength > 0 ? 2 : 0);
if (msgLength > MaxBufferLength)
{
//drop message
_localBuffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.DecodeError);
}
//fetch data
if (msgLength > 0)
{
timeout = T_FRAME_ABORT; //set sub timeout
while (_localOffset < fullMsgLength)
{
//read
var rx = _port.Read(_localBuffer, _localOffset, fullMsgLength - _localOffset, timeout);
if (rx == -ETIMEDOUT)
{
//drop message
var status = _localOffset == 0 ? GetMessageStatus.Timeout : GetMessageStatus.SubTimeout;
_localBuffer[0] = 0xFF;
RemoveGarbage();
return(status);
}
if (rx < 0)
{
//drop message
_localBuffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.ConnectionError);
}
if (rx == 0)
{
//drop message
_localBuffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.ConnectionClose);
}
_localOffset += rx;
}
//verify data crc
if (
MSTP.Decode(_localBuffer, 0, _localOffset, out frameType, out destinationAddress,
out sourceAddress, out msgLength) < 0)
{
//drop message
_localBuffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.DecodeError);
}
}
//signal frame event
if (FrameRecieved != null)
{
var frameTypeCopy = frameType;
var destinationAddressCopy = destinationAddress;
var sourceAddressCopy = sourceAddress;
var msgLengthCopy = msgLength;
ThreadPool.QueueUserWorkItem(
o => { FrameRecieved(this, frameTypeCopy, destinationAddressCopy, sourceAddressCopy, msgLengthCopy); }, null);
}
Log.Debug($"{frameType} {destinationAddress:X2}");
//done
return(GetMessageStatus.Good);
}
private GetMessageStatus GetNextMessage(int timeout_ms, out BacnetMstpFrameTypes frame_type, out byte destination_address, out byte source_address, out int msg_length)
{
int timeout;
frame_type = BacnetMstpFrameTypes.FRAME_TYPE_TOKEN;
destination_address = 0;
source_address = 0;
msg_length = 0;
//fetch header
while (m_local_offset < MSTP.MSTP_HEADER_LENGTH)
{
if (m_port == null)
{
return(GetMessageStatus.ConnectionClose);
}
if (m_local_offset > 0)
{
timeout = T_FRAME_ABORT; //set sub timeout
}
else
{
timeout = timeout_ms; //set big silence timeout
}
//read
int rx = m_port.Read(m_local_buffer, m_local_offset, MSTP.MSTP_HEADER_LENGTH - m_local_offset, timeout);
if (rx == -ETIMEDOUT)
{
//drop message
GetMessageStatus status = m_local_offset == 0 ? GetMessageStatus.Timeout : GetMessageStatus.SubTimeout;
m_local_buffer[0] = 0xFF;
RemoveGarbage();
return(status);
}
if (rx < 0)
{
//drop message
m_local_buffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.ConnectionError);
}
if (rx == 0)
{
//drop message
m_local_buffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.ConnectionClose);
}
m_local_offset += rx;
//remove paddings & garbage
RemoveGarbage();
}
//decode
if (MSTP.Decode(m_local_buffer, 0, m_local_offset, out frame_type, out destination_address, out source_address, out msg_length) < 0)
{
//drop message
m_local_buffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.DecodeError);
}
//valid length?
int full_msg_length = msg_length + MSTP.MSTP_HEADER_LENGTH + (msg_length > 0 ? 2 : 0);
if (msg_length > MaxBufferLength)
{
//drop message
m_local_buffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.DecodeError);
}
//fetch data
if (msg_length > 0)
{
timeout = T_FRAME_ABORT; //set sub timeout
while (m_local_offset < full_msg_length)
{
//read
int rx = m_port.Read(m_local_buffer, m_local_offset, full_msg_length - m_local_offset, timeout);
if (rx == -ETIMEDOUT)
{
//drop message
GetMessageStatus status = m_local_offset == 0 ? GetMessageStatus.Timeout : GetMessageStatus.SubTimeout;
m_local_buffer[0] = 0xFF;
RemoveGarbage();
return(status);
}
if (rx < 0)
{
//drop message
m_local_buffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.ConnectionError);
}
if (rx == 0)
{
//drop message
m_local_buffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.ConnectionClose);
}
m_local_offset += rx;
}
//verify data crc
if (MSTP.Decode(m_local_buffer, 0, m_local_offset, out frame_type, out destination_address, out source_address, out msg_length) < 0)
{
//drop message
m_local_buffer[0] = 0xFF;
RemoveGarbage();
return(GetMessageStatus.DecodeError);
}
}
//signal frame event
if (FrameRecieved != null)
{
BacnetMstpFrameTypes _frame_type = frame_type;
byte _destination_address = destination_address;
byte _source_address = source_address;
int _msg_length = msg_length;
ThreadPool.QueueUserWorkItem((o) => { FrameRecieved(this, _frame_type, _destination_address, _source_address, _msg_length); }, null);
}
if (StateLogging)
{
Trace.WriteLine("" + frame_type + " " + destination_address.ToString("X2") + " ");
}
//done
return(GetMessageStatus.Good);
}