CAN and LIN logging to the same MF4 file

[MatRosiek]

Hello,
Im struggling to write some code in Python which will allow to save CAN messages and LIN messages to the same MF4 file.
Im a little bit lost of how I should do it via this library.

1. How to actually log CAN frame for example to MF4 file? I stumbled upon this example here: python-can.
2. Why there is actually 'CAN_DataFrame' fixed string needed?
3. What if i want to group data in such file like for example having two groups called LIN and second one CAN how to do it?
4. Suppose if I have 2 CAN interfaces and I need to log messages to this one file - is it possible? How should i group data from CAN0 and e.g. CAN1 in this file?

Im a little bit confused with usage of Signal class. As it looks like it can handle grouping too?

Thanks in advance for any help.

[danielhrisca]

2. Why there is actually 'CAN_DataFrame' fixed string needed?

This is the MDF spec for bus logging. You need to respect the field names and also to set the proper metadata in the file. Use the python-can code as a guide. You can have multiple groups with the same channel names; for example you can group the logging using the bus channel number (0, 1, ...) by setting the BusChannel value. Have a look here https://github.com/danielhrisca/asammdf/files/4076869/J1939-DBC-MDF4.zip

[dsyue]

thank you for your answer, i am searching for it!