public static int Decode(byte[] buffer, int offset, int max_length, out BacnetPtpFrameTypes frame_type, out int msg_length)
{
frame_type = (BacnetPtpFrameTypes)buffer[offset + 2];
msg_length = (buffer[offset + 3] << 8) | (buffer[offset + 4] << 0);
byte crc_header = buffer[offset + 5];
ushort crc_data = 0;
if (max_length < PTP_HEADER_LENGTH)
{
return(-1); //not enough data
}
if (msg_length > 0)
{
crc_data = (ushort)((buffer[offset + 6 + msg_length + 1] << 8) | (buffer[offset + 6 + msg_length + 0] << 0));
}
if (buffer[offset + 0] != PTP_PREAMBLE1)
{
return(-1);
}
if (buffer[offset + 1] != PTP_PREAMBLE2)
{
return(-1);
}
if (MSTP.CRC_Calc_Header(buffer, offset + 2, 3) != crc_header)
{
return(-1);
}
if (msg_length > 0 && max_length >= (PTP_HEADER_LENGTH + msg_length + 2) && MSTP.CRC_Calc_Data(buffer, offset + 6, msg_length) != crc_data)
{
return(-1);
}
return(8 + (msg_length) + (msg_length > 0 ? 2 : 0));
}
public int Send(byte[] buffer, int offset, int data_length, BacnetAddress address, bool wait_for_transmission, int timeout)
{
BacnetPtpFrameTypes frame_type = BacnetPtpFrameTypes.FRAME_TYPE_DATA0;
if (m_sequence_counter)
{
frame_type = BacnetPtpFrameTypes.FRAME_TYPE_DATA1;
}
m_sequence_counter = !m_sequence_counter;
//add header
int full_length = PTP.Encode(buffer, offset - PTP.PTP_HEADER_LENGTH, frame_type, data_length);
//wait for send allowed
if (!m_may_send.WaitOne(timeout))
{
return(-BacnetMstpProtocolTransport.ETIMEDOUT);
}
//debug
if (StateLogging)
{
Trace.WriteLine(" " + frame_type, null);
}
//send
SendWithXonXoff(buffer, offset - HeaderLength, full_length);
return(data_length);
}
public static int Decode(byte[] buffer, int offset, int maxLength, out BacnetPtpFrameTypes frameType, out int msgLength)
{
if (maxLength < PTP_HEADER_LENGTH) // not enough data
{
frameType = BacnetPtpFrameTypes.FRAME_TYPE_CONNECT_REQUEST; // don't care
msgLength = 0;
return(-1); //not enough data
}
frameType = (BacnetPtpFrameTypes)buffer[offset + 2];
msgLength = (buffer[offset + 3] << 8) | (buffer[offset + 4] << 0);
var crcHeader = buffer[offset + 5];
ushort crcData = 0;
if (msgLength > 0)
{
if (offset + 6 + msgLength + 1 >= buffer.Length)
{
return(-1);
}
crcData = (ushort)((buffer[offset + 6 + msgLength + 1] << 8) | (buffer[offset + 6 + msgLength + 0] << 0));
}
if (buffer[offset + 0] != PTP_PREAMBLE1)
{
return(-1);
}
if (buffer[offset + 1] != PTP_PREAMBLE2)
{
return(-1);
}
if (MSTP.CRC_Calc_Header(buffer, offset + 2, 3) != crcHeader)
{
return(-1);
}
if (msgLength > 0 && maxLength >= PTP_HEADER_LENGTH + msgLength + 2 && MSTP.CRC_Calc_Data(buffer, offset + 6, msgLength) != crcData)
{
return(-1);
}
return(8 + msgLength + (msgLength > 0 ? 2 : 0));
}
public static int Encode(byte[] buffer, int offset, BacnetPtpFrameTypes frameType, int msgLength)
{
buffer[offset + 0] = PTP_PREAMBLE1;
buffer[offset + 1] = PTP_PREAMBLE2;
buffer[offset + 2] = (byte)frameType;
buffer[offset + 3] = (byte)((msgLength & 0xFF00) >> 8);
buffer[offset + 4] = (byte)((msgLength & 0x00FF) >> 0);
buffer[offset + 5] = MSTP.CRC_Calc_Header(buffer, offset + 2, 3);
if (msgLength > 0)
{
//calculate data crc
var dataCrc = MSTP.CRC_Calc_Data(buffer, offset + 6, msgLength);
buffer[offset + 6 + msgLength + 0] = (byte)(dataCrc & 0xFF); //LSB first!
buffer[offset + 6 + msgLength + 1] = (byte)(dataCrc >> 8);
}
return(PTP_HEADER_LENGTH + msgLength + (msgLength > 0 ? 2 : 0));
}
private void SendFrame(BacnetPtpFrameTypes frameType, byte[] buffer = null, int msgLength = 0)
{
if (_port == null)
{
return;
}
var fullLength = PTP.PTP_HEADER_LENGTH + msgLength + (msgLength > 0 ? 2 : 0);
if (buffer == null)
{
buffer = new byte[fullLength];
}
PTP.Encode(buffer, 0, frameType, msgLength);
Log.AddCustomEvent(LagoVista.Core.PlatformSupport.LogLevel.Message, "BacnetPtpProtocol", frameType.ToString());
//send
SendWithXonXoff(buffer, 0, fullLength);
}
private void SendFrame(BacnetPtpFrameTypes frameType, byte[] buffer = null, int msgLength = 0)
{
if (_port == null)
{
return;
}
var fullLength = PTP.PTP_HEADER_LENGTH + msgLength + (msgLength > 0 ? 2 : 0);
if (buffer == null)
{
buffer = new byte[fullLength];
}
PTP.Encode(buffer, 0, frameType, msgLength);
Log.Debug(frameType);
//send
SendWithXonXoff(buffer, 0, fullLength);
}
private void SendFrame(BacnetPtpFrameTypes frame_type, byte[] buffer = null, int msg_length = 0)
{
if (m_port == null)
{
return;
}
int full_length = PTP.PTP_HEADER_LENGTH + msg_length + (msg_length > 0 ? 2 : 0);
if (buffer == null)
{
buffer = new byte[full_length];
}
PTP.Encode(buffer, 0, frame_type, msg_length);
//debug
if (StateLogging)
{
Trace.WriteLine(" " + frame_type, null);
}
//send
SendWithXonXoff(buffer, 0, full_length);
}
private void SendFrame(BacnetPtpFrameTypes frame_type, byte[] buffer = null, int msg_length = 0)
{
if (m_port == null) return;
int full_length = PTP.PTP_HEADER_LENGTH + msg_length + (msg_length > 0 ? 2 : 0);
if(buffer == null) buffer = new byte[full_length];
PTP.Encode(buffer, 0, frame_type, msg_length);
//debug
if (StateLogging)
Trace.WriteLine(" " + frame_type, null);
//send
SendWithXonXoff(buffer, 0, full_length);
}
private void SendDisconnect(BacnetPtpFrameTypes bacnetPtpFrameTypes, BacnetPtpDisconnectReasons bacnetPtpDisconnectReasons)
{
byte[] buffer = new byte[PTP.PTP_HEADER_LENGTH + 1 + 2];
buffer[PTP.PTP_HEADER_LENGTH] = (byte)bacnetPtpDisconnectReasons;
SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_DISCONNECT_REQUEST, buffer, 1);
}
private BacnetMstpProtocolTransport.GetMessageStatus GetNextMessage(byte[]buffer, ref int offset, int timeout_ms, out BacnetPtpFrameTypes frame_type, out int msg_length)
{
BacnetMstpProtocolTransport.GetMessageStatus status;
int timeout = timeout_ms;
frame_type = BacnetPtpFrameTypes.FRAME_TYPE_HEARTBEAT_XOFF;
msg_length = 0;
bool compliment_next = false;
//fetch header
while (offset < PTP.PTP_HEADER_LENGTH)
{
if (m_port == null) return BacnetMstpProtocolTransport.GetMessageStatus.ConnectionClose;
if (offset > 0)
timeout = T_FRAME_ABORT; //set sub timeout
else
timeout = timeout_ms; //set big silence timeout
//read
int rx = m_port.Read(buffer, offset, PTP.PTP_HEADER_LENGTH - offset, timeout);
status = ProcessRxStatus(buffer, ref offset, rx);
if (status != BacnetMstpProtocolTransport.GetMessageStatus.Good) return status;
//remove XON/XOFF
int new_offset = offset + rx;
RemoveXonOff(buffer, offset, ref new_offset, ref compliment_next);
offset = new_offset;
//remove garbage
RemoveGarbage(buffer, ref offset);
}
//greeting
if (IsGreeting(buffer, 0, offset))
{
//get last byte
int rx = m_port.Read(buffer, offset, 1, timeout);
status = ProcessRxStatus(buffer, ref offset, rx);
if (status != BacnetMstpProtocolTransport.GetMessageStatus.Good) return status;
offset += 1;
if (IsGreeting(buffer, 0, offset))
{
frame_type = BacnetPtpFrameTypes.FRAME_TYPE_GREETING;
if (StateLogging) Trace.WriteLine(frame_type, null);
return BacnetMstpProtocolTransport.GetMessageStatus.Good;
}
else
{
//drop message
buffer[0] = 0xFF;
RemoveGarbage(buffer, ref offset);
return BacnetMstpProtocolTransport.GetMessageStatus.DecodeError;
}
}
//decode
if (PTP.Decode(buffer, 0, offset, out frame_type, out msg_length) < 0)
{
//drop message
buffer[0] = 0xFF;
RemoveGarbage(buffer, ref offset);
return BacnetMstpProtocolTransport.GetMessageStatus.DecodeError;
}
//valid length?
int full_msg_length = msg_length + PTP.PTP_HEADER_LENGTH + (msg_length > 0 ? 2 : 0);
if (msg_length > MaxBufferLength)
{
//drop message
buffer[0] = 0xFF;
RemoveGarbage(buffer, ref offset);
return BacnetMstpProtocolTransport.GetMessageStatus.DecodeError;
}
//fetch data
if (msg_length > 0)
{
timeout = T_FRAME_ABORT; //set sub timeout
while (offset < full_msg_length)
{
//read
int rx = m_port.Read(buffer, offset, full_msg_length - offset, timeout);
status = ProcessRxStatus(buffer, ref offset, rx);
if (status != BacnetMstpProtocolTransport.GetMessageStatus.Good) return status;
//remove XON/XOFF
int new_offset = offset + rx;
RemoveXonOff(buffer, offset, ref new_offset, ref compliment_next);
offset = new_offset;
}
//verify data crc
if (PTP.Decode(buffer, 0, offset, out frame_type, out msg_length) < 0)
{
//drop message
buffer[0] = 0xFF;
RemoveGarbage(buffer, ref offset);
return BacnetMstpProtocolTransport.GetMessageStatus.DecodeError;
}
}
//debug
if (StateLogging)
Trace.WriteLine(frame_type, null);
//done
return BacnetMstpProtocolTransport.GetMessageStatus.Good;
}
private BacnetMstpProtocolTransport.GetMessageStatus GetNextMessage(byte[] buffer, ref int offset,
int timeoutMs, out BacnetPtpFrameTypes frameType, out int msgLength)
{
BacnetMstpProtocolTransport.GetMessageStatus status;
var timeout = timeoutMs;
frameType = BacnetPtpFrameTypes.FRAME_TYPE_HEARTBEAT_XOFF;
msgLength = 0;
var complimentNext = false;
//fetch header
while (offset < PTP.PTP_HEADER_LENGTH)
{
if (_port == null)
{
return(BacnetMstpProtocolTransport.GetMessageStatus.ConnectionClose);
}
timeout = offset > 0 ? T_FRAME_ABORT : timeoutMs;
//read
var rx = _port.Read(buffer, offset, PTP.PTP_HEADER_LENGTH - offset, timeout);
status = ProcessRxStatus(buffer, ref offset, rx);
if (status != BacnetMstpProtocolTransport.GetMessageStatus.Good)
{
return(status);
}
//remove XON/XOFF
var newOffset = offset + rx;
RemoveXonOff(buffer, offset, ref newOffset, ref complimentNext);
offset = newOffset;
//remove garbage
RemoveGarbage(buffer, ref offset);
}
//greeting
if (IsGreeting(buffer, 0, offset))
{
//get last byte
var rx = _port.Read(buffer, offset, 1, timeout);
status = ProcessRxStatus(buffer, ref offset, rx);
if (status != BacnetMstpProtocolTransport.GetMessageStatus.Good)
{
return(status);
}
offset += 1;
if (IsGreeting(buffer, 0, offset))
{
frameType = BacnetPtpFrameTypes.FRAME_TYPE_GREETING;
if (StateLogging)
{
Trace.WriteLine(frameType, null);
}
return(BacnetMstpProtocolTransport.GetMessageStatus.Good);
}
//drop message
buffer[0] = 0xFF;
RemoveGarbage(buffer, ref offset);
return(BacnetMstpProtocolTransport.GetMessageStatus.DecodeError);
}
//decode
if (PTP.Decode(buffer, 0, offset, out frameType, out msgLength) < 0)
{
//drop message
buffer[0] = 0xFF;
RemoveGarbage(buffer, ref offset);
return(BacnetMstpProtocolTransport.GetMessageStatus.DecodeError);
}
//valid length?
var full_msg_length = msgLength + PTP.PTP_HEADER_LENGTH + (msgLength > 0 ? 2 : 0);
if (msgLength > MaxBufferLength)
{
//drop message
buffer[0] = 0xFF;
RemoveGarbage(buffer, ref offset);
return(BacnetMstpProtocolTransport.GetMessageStatus.DecodeError);
}
//fetch data
if (msgLength > 0)
{
timeout = T_FRAME_ABORT; //set sub timeout
while (offset < full_msg_length)
{
//read
var rx = _port.Read(buffer, offset, full_msg_length - offset, timeout);
status = ProcessRxStatus(buffer, ref offset, rx);
if (status != BacnetMstpProtocolTransport.GetMessageStatus.Good)
{
return(status);
}
//remove XON/XOFF
var newOffset = offset + rx;
RemoveXonOff(buffer, offset, ref newOffset, ref complimentNext);
offset = newOffset;
}
//verify data crc
if (PTP.Decode(buffer, 0, offset, out frameType, out msgLength) < 0)
{
//drop message
buffer[0] = 0xFF;
RemoveGarbage(buffer, ref offset);
return(BacnetMstpProtocolTransport.GetMessageStatus.DecodeError);
}
}
//debug
if (StateLogging)
{
Trace.WriteLine(frameType, null);
}
//done
return(BacnetMstpProtocolTransport.GetMessageStatus.Good);
}
private void SendDisconnect(BacnetPtpFrameTypes bacnetPtpFrameTypes, BacnetPtpDisconnectReasons bacnetPtpDisconnectReasons)
{
byte[] buffer = new byte[PTP.PTP_HEADER_LENGTH + 1 + 2];
buffer[PTP.PTP_HEADER_LENGTH] = (byte)bacnetPtpDisconnectReasons;
SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_DISCONNECT_REQUEST, buffer, 1);
}