low level CAN service question

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Regarding CAN bus I'm having an issue generating a signals.json file from a signals.xml file. Following the instructions in the link below I created a signals.xml file from my DBC file using Vector's CANdb++ then created a mapping.json file.


The following is not working for me:

python -m openxc.utils ./xml_to_json.py signals.xml mapping.json signals.json

The above appears to do nothing other than load the modules then exit.

I've been able to manually create my own signals.json file taking a single message from the XML file then went on to create application-generated.cpp, built low-can-service, installed it and verified it can handle the new message.

Any insight would be appreciated. 

Thanks,
Dave

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