I'm using the beacon example (SDK 12.2.0) which I've modified slightly so that a sensor output initiates advertising for 20 seconds with LED1 flashing accordingly. I want to be able to change which LED flashes. I've looked at the SDK code using Keil's "Go to Definition" and "Find in Files" utilities but can't figure what to change so that I can use one of the other LEDs on the board to indicate advertising.