How to use data received over BLE UART simulation to toggle pin

The data from the Nordic UART Service shows up in nus_data_handler in main.c.

So I'd write something along the lines of 

if (p_evt->params.rx_data.p_data[i] == 1){

        //do something

}

inside of nus_data_handler()?

Yes, inside of the "if (p_evt->type == BLE_NUS_EVT_RX_DATA) " statement.

Also, you'll probably want to look for a character '1', not the value 1.  (I don't think you can send raw values in the nRF mobile app)

Alrighty thank you brother