Another method is to Breach a device that you can then ping. Then spam pings to 0 RAM, Rest to recover RAM. Repeat. It levels up Perks for both Breach Protocol and Quickhacking.

You can level this up pretty fast by sleeping in your apartment bed to get the 20% bonus skill xp gain, and then use the “Distract Enemies” quick hack on vending machines. It will work whether there is anyone around or not. Just be sure to only use it once per machine, or you’ll get super diminished returns