ORANGE Pi 3B - Hardware Watch the Door Dog Test

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a. Test UART3
root@orangepi:~/wiringOP-Python/examples# python3 serialTest.py --device \
"/dev/ttyS3"
Out: 0: -> 0
Out: 1: -> 1
Out: 2: -> 2
Out: 3: -> 3
Out: 4:^C
exit
b. Test UART7
root@orangepi:~/wiringOP-Python/examples# python3 serialTest.py --device \
"/dev/ttyS7"
Out: 0: -> 0
Out: 1: -> 1
Out: 2: -> 2
Out: 3: -> 3
Out: 4:^C
exit
c. Test UART9
root@orangepi:~/wiringOP-Python/examples# python3 serialTest.py --device \
"/dev/ttyS9"
Out: 0: -> 0
Out: 1: -> 1
Out: 2: -> 2
Out: 3: -> 3
Out: 4:^C
exit
3.18. Hardware watch the door dog test
The watchdog_test program is pre-installed in the Linux system released by Orange
Pi, which can be tested directly.