Pixhawk with UAVCAN GUI tool

I connected my pixhawk board to SLCAN adapter and launched the UAVCAN GUI Tool. WHich file should I upload into "Location of customer DSDL definitions[optional]"
which is popping up in GUI tool. I tried all uploading the files but I am not able to see any nodes under node properties. Only the pixhawk board is getting recognized.

I tried with a new patch of firmware code from git. But it is not giving me any results. I checked node properties and it is not able to fetch any node: Timeout error.

I have no clue how to proceed in this case. I followed all documentation as well. Can anyone who worked on GUI tool before, help me out?
Thank you