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I have an embedded Linux on a custom board and I would like to send and receive file over its serial port.

The only way to communicate with this device is over serial and the device offers a console on this serial port.

This board doesn't have kermit neither busybox rx nor lrzsz.

- Sending file to remote

I was able to send file to the board following this thread.

Host side Remote side cat file | base64 > file_b64 cat > file_b64 minicom's ctrlA-S => send 'file_b64' cat file_b64 | base64 --decode > file

- Getting file from remote

Now I would like to retrieve a file from remote system.

Minicom has a tool for receiving files but as I only have the serial port's console using minicom to issue commands on remote side, I can't find how to do it.

I have tried using kermit on host side but it seems that I also needs to have kermit on the remote side.

EDIT:

I have also tried to reverse the sending method but with no success as i receive nothing from serial port on host side.

Host side Remote side cat file | base64 > file_b64 (sleep 10; cat file_b64 > /dev/ttyS0) & minicom's ctrlA-X => exit minicom cat /dev/ttyUSB0 > file_b64

Can't use minicom's receive tool cause it only support xmodem, ymodem, zmodem and kermit tranfers and not ascii.

Is there a way to retrieve files from remote without having to type commands into its console?

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  • 2
    Why don't you use the slip module to build a tcp/ip connection? tldp.org/LDP/nag2/x-087-2-slip.operation.html Commented Aug 3, 2018 at 14:30
  • Didn't know this module, however slattach is not available on remote side Commented Aug 3, 2018 at 14:37

2 Answers 2

Reset to default
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Finally found out that I was issuing the wrong command on receiver's side.

Receive command shall be : cat < /dev/ttyUSB0 > file_b64

Summary

To receive from remote :

 Host side | Remote side | | #Encode to base64 | cat file | base64 > file_b64 | | #Send after timeout | (sleep 10; cat file_b64 > /dev/ttyS0) & | ############################################################# ### Exit minicom but keep configuration (ctrlA-Z, then Q) ### ############################################################# | #Receive file | cat < /dev/ttyUSB0 > file_b64 | | #Decode file | cat file_b64 | base64 -di > file |
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6

Summarizing above posts i found something like this:

Sending.

Start receiving on target:

cat | base64 -d > filetotarget.bin

Exit minicom with Ctrl-A + Q and then run on host machine:

cat filetotarget.bin | base64 > /dev/ttyUSB0

Return to minicom and press Ctrl-D to finish receive process.

Receiving.

Start delayed send on target:

sleep 10 ; cat filefromtarget.bin | base64

Exit minicom with Ctrl-A + Q. Then start receiving on host:

cat < /dev/ttyUSB0 | base64 -di > filefromtarget.bin
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