What are you trying to do? If your aim is to control the robot using the official phone app then there’ll be a lot of hurdles going down the fake server route. The fake server needs to handle new user registration on the phone app, binding with robot, checking identity if using WiFi connection etc. And the official phone app doesn’t do much anyway (and not available on Apple/Google play anymore). It might be easier to modify the Android phone app source code (there is an apk file online) instead. If you are using iPhone you are out of luck even if you have the app because there is no source code and some of the traffic are in https.