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I have a remote machine running Ubuntu that has an on-board USB serial converter. I can easily access remote's terminal by connecting via USB to Windows and running PuTTY. However, is it possible to get to remote's terminal this way using the RPi 4 terminal? Essentially, I'd like to replace the Windows machine and PuTTY with the RPi 4.

When I connect remote's console port to RPi 4, it is immediately recognized and attached to /dev/ttyUSB0

$ dmesg
$ ...
$ usb 1-1.1: new full-speed USB device number 4 using xhci_hcd
$ usb 1-1.1: New USB device found, idVendor=0403, idProduct=6015, bcdDevice=10.00
$ usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
$ usb 1-1.1: Product: FT231X USB UART
$ usb 1-1.1: Manufacturer: FTDI
$ usb 1-1.1: SerialNumber: D200BOAV
$ ftdi_sio 1-1.1:1.0: FTDI USB Serial Device converter detected
$ usb 1-1.1: Detected FT-X
$ usb 1-1.1: FTDI USB Serial Device converter now attached to ttyUSB0

From the RPi 4 terminal, how can I access remote's terminal?

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1 Answer 1

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Run a SSH server on the Ubuntu machine.

Then use SSH on the Pi to open a terminal on the Ubuntu machine.

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  • I am specifically trying to connect via USB serial port. Is SSH capable of this?
    – earl
    Oct 24, 2022 at 20:07
  • Sorry, I misunderstood your question. What's stopping you from using minicom or screen?
    – joan
    Oct 24, 2022 at 20:14
  • I would like to automate filesharing between multiple machines. It is simple with SSH and using an ethernet connection between the two. I use crontab to periodically rsync between the machines. However, since the RPi only has one ethernet port and multiple USB ports, I thought it may be possible to do this through USB serial.
    – earl
    Oct 24, 2022 at 20:19
  • minicom and screen are Linux commands which do pretty much the same as putty. Perhaps you need to clarify your question.
    – joan
    Oct 24, 2022 at 20:31
  • Can minicom or screen be used without their window interface? For example, I'd like to echo "Hello" on a remote machine. Can this be done without opening minicom? Similar to $ ssh root@remote echo Hello
    – earl
    Oct 24, 2022 at 20:45

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