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how to get a screenshot in limit system
# 1
# USB connect to the android device
adb devices
adb shell
# open netwotk debug mode
setprop service.adb.tcp.port 5555
# 2
# setup android device listen TCP/IP connect on 5555 port
adb tcpip 5555
# remove USB
# conncet to a same local network
adb connect #ip:port
#already connected to 172.18.1.111:5555
adb devices
# List of devices attached
# 172.18.1.111:5555 device
adb shell screencap -p /sdcard/230320.png
adb pull /sdcard/230320.png F:/1share
# check the .png picture in disk F:/1share
# done