func (tello *Tello) StopLanding() {
	tello.ctrlMu.Lock()
	defer tello.ctrlMu.Unlock()
	tello.ctrlSeq++
	pkt := newPacket(ptSet, msgDoLand, tello.ctrlSeq, 1)
	pkt.payload[0] = 1
	tello.ctrlConn.Write(packetToBuffer(pkt))
}
StopLanding cancels a land command.
package tello
func (tello *Tello) TakeOff() {
	tello.ctrlMu.Lock()
	tello.autoXYMu.Lock()
	tello.homeValid = false  
	tello.autoXYMu.Unlock()
	tello.ctrlSeq++
	pkt := newPacket(ptSet, msgDoTakeoff, tello.ctrlSeq, 0)
	tello.ctrlConn.Write(packetToBuffer(pkt))
	tello.ctrlMu.Unlock()
}
func (tello *Tello) ThrowTakeOff() {
	tello.ctrlMu.Lock()
	tello.autoXYMu.Lock()
	tello.homeValid = false  
	tello.autoXYMu.Unlock()
	tello.ctrlSeq++
	pkt := newPacket(ptGet, msgDoThrowTakeoff, tello.ctrlSeq, 0)
	tello.ctrlConn.Write(packetToBuffer(pkt))
	tello.ctrlMu.Unlock()
}
func (tello *Tello) Land() {
	tello.ctrlMu.Lock()
	defer tello.ctrlMu.Unlock()
	tello.ctrlSeq++
	pkt := newPacket(ptSet, msgDoLand, tello.ctrlSeq, 1)
	pkt.payload[0] = 0  
	tello.ctrlConn.Write(packetToBuffer(pkt))
}