Problem Solved!
Issues I had in the process:
- Paper account may receive RT bars(like 1 or 5 minutes bars), to enable that you need to enable "Share real-time market data subscriptions with paper trading account" option in your real live account, ask IB support for help to find it
- You MUST run the trading strategy on the same computer where the real live account runs, it's not possible to have the live account run TWS on one computer and the paper TWS run on another
once you take care of the above, the Backtrader running IB trading should start to trade with the paper account