After a crash into a wall, Tello won't start or take-off with aTelloPilot app - everything shows connected and ready to fly, but motors don't spin. Then I tried it with the official Tello app and it fly normally, but still not with aTelloPilot.
I can see it's an app problem. Have you tried to kill the app running in the background (atellopilot) and restart it again? I haven't used it but with my experience with other applications I'll just force close the app and restart it again. Hope it helps.