WARN: Unknown device error
If you see Unkown Device warning, it means that device with that id is not registered. It's not possible that you get positions stored for it. It must be different device.
Not sure but I have turned filtering on and now I'm not getting the invalid positions
I'm receiving Unkown Device warning however I do believe the database is being updated with some of the positions. How do I make sure this doesn't occur?