Send a command over a VHF-link to bring down a picture on low-Earth orbit - Swisscube
The Swisscube mission is known for the being the first Swiss spacecraft mission. EATOPS joined that effort and operated the spacecraft from its Noordwijk CubeSat ground station (KD2AMA) facility. The com system is based on a AX.25 protocol. The telecommands are encapsulated into the CCSDS PUS format.