@ikv0315 maybe try setting the address filter for a specific piece of data. Polling for anything probably won't return anything if the filter is exclusive to everything it's not set to. Makes sense in a way because there is no way you can display scrolling data fast enough. If you can get into the source code and set a "data capture" to a buffer for set time or number of frames and then display the buffer it might help to see what's going on.

There also seems to 2 different bit frame lengths, 11 and 29, so that might be something to look into.

Keep the wiring short and twisted pair. BTW How are you tapping in to the wires?

Also maybe make sure you have the right identifiers for the CAN bus you are working with. AFAIK the other diagnostic and communication lines are Can buses(use CAN protocol) as well and probably use different identifiers.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)