Also apparently I have found how to switch the drone on remotely with help of charging coil. If we wire +5V to microusb for few seconds and after wire it off, the drone will be switched on and will be ready to connect. In case if we keep +5V (without wiring off) the drone will be off and keep charging.
Very intersting, I wonder if it possible to install Fpv software on pc, android emulator , connect pc to Tello thru wifi, connect remotely to pc thru Lan internet, control the Tello, big hassle but cool if doable.
Thanks for the auto power on trick on power connect.