The program is designed to reproduce the behavior of the pico-littlefs-usb and littlefs software package using only a PC. Reads a pre-recorded pcap file of the actual exchange between the PC OS and the USB device (MCU) on which the software package is installed; analyzes USB MSC packets; and then calls the pico-littlefs-usb layer functions. The source code of the package is the same on PC and USB device, the rand library function is replaced with a simple increment, so the execution result should theoretically be the same. So far, six tests have been carried out: three each on Windows 10 and Ubuntu 20.04. The test results are:

• Win10 > pico-littlefs-pcap-test -t1w -c

MCU	PC
create test dir
USB cable inserted
	copy file bbb.txt
	delete file bbb.txt
	copy same file bbb.txt again
USB cable pulled out and reinserted
read file bbb.txt -> no file	read file bbb.txt -> invalid content
Test result: failed

• Ubuntu > pico-littlefs-pcap-test -t1u -c

MCU	PC
create test dir
USB cable inserted
	copy file bbb.txt
	delete file bbb.txt
	copy same file bbb.txt again
USB cable pulled out and reinserted
read file bbb.txt -> valid content	read file bbb.txt -> valid content
Test result: passed

• Win10(Ubuntu) > pico-littlefs-pcap-test -t2w(-t2u) -c

MCU	PC
create test dir
create test/aaa.bin (120000 bytes)
USB cable inserted
	read file aaa.bin -> valid content
Test result: passed

• Win10 > pico-littlefs-pcap-test -t3w -c

MCU	PC
create test dir
USB cable inserted
	copy file bbb.txt
	delete file bbb.txt
	copy file bbb.txt with different content and less size
USB cable pulled out and reinserted
read file bbb.txt -> no file	read file bbb.txt -> valid content
Test result: failed

• Ubuntu > pico-littlefs-pcap-test -t3u -c

MCU	PC
create test dir
USB cable inserted
	copy file bbb.txt
	delete file bbb.txt
	copy file bbb.txt with different content and less size
USB cable pulled out and reinserted
read file bbb.txt -> invalid content	read file bbb.txt -> invalid content
Test result: failed