( https://oscarliang.com/use-arduino-as-usb-serial-adapter-converter/ )
I needed a USB to Serial adapter when I was trying to debug why I couldn't flash an open source firmware to a router (ended up not being able to do that). In this website, the blogger gives three methods. I found the sketch upload (#3) one the easiest and it worked. I was able to then read the uboot sequence from a router I was trying to upload an open source firmware to (Couldn't do it from webflash or TFTP, couldn't find out why).
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| Connected to a TP-Link router |
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| Boot sequence from serial port, not sure what's happening at very start |
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