also interesting. How to reverse engineer the DSMx protocol (drone control) and attack it. A lot of parallels with IoT things. But also good for getting free drones
The hardware for it costs about 94$ : https://www.adafruit.com/wishlists/415801

https://youtu.be/abl6oOxLRXs
It's a nice little box that only needs a second remote to be able to switch control to it. I think the second remote is hard wired in the code but I'm not sure.
http://www.numerama.com/tech/204520-des-drones-capturables-a-distance-en-prenant-le-controle-en-vol.html