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Tested with Wireshark 1.99.7 on Windows. 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. Start or stop the capture directly from the interface.