code: func (b *Driver) Stop() error {
  	b.pcmdMutex.Lock()
  	defer b.pcmdMutex.Unlock()
  
  	b.Pcmd = Pcmd{
  		Flag:  0,
  		Roll:  0,
  		Pitch: 0,
  		Yaw:   0,
  		Gaz:   0,
  		Psi:   0,
  	}
  
  	return nil
  }
docs: // Stop tells the drone to stop moving in any direction and simply hover in place