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Tested with Wireshark on Windows (mostly working). To use extcap, run Wireshark and go to the About-dialog. Find a tab located there named "Folders". Locate the extcap search path. Copy the mstpcap.exe to that folder, which may not exist. Restart Wireshark, and look for "BACnet MS/TP on COMx" interfaces. Configure the interface to change baud rate. Capture directly from the interface.
BACnet Stack - Win32 This directory contains a demo program that compiles with a Win32 compiler. It was tested with the freely downloadable Borland C++ 5.5, as well as Borland C++ 5 and Visual C++ 6.0. The makefile.mak file is used with the Borland command line tools. Run setvars.bat to configure the environment for the Borland tools. Edit it if necessary to set the correct location of your tools. The bacnet.ide file is used with the Borland IDE. The bacnet directory is used with Visual C++ 6 tools, and there is a workspace file bacnet.dsw that is used to compile the demo program.