sets buy limit and sell limit trades at the same time

[rezauso]

How can I set up a strategy with the following conditions:
That recognizes the previous 4-hour candle and sets buy limit and sell limit trades 30 pips higher and 30 pips lower at the same time. Whichever one is activated deactivates the other.

[l'andorrà]

What os the bot supposed to find on the chart on those previous 4 hours in order to program those trades? Maybe the highest and lowest price levels within that period?