So what I am trying to achieve seems quite simple, but I can not seem to find a way to do it without using external utilities or not pre-installed libraries.
I have an embedded system running Linux (kernel 3.x depending on the models). On it I have access to most GNU core utilities (like cat, sed, ls, tar and so on).
I can access a shell session on it through
/dev/ttyUSBx, for example using screen :
screen /dev/ttyUSB0 9600
The computer from which I am running screen (let's call it
source) is an ArchLinux install, which has access to the internet.
The embedded system (let's call it
target) I am trying to access is a Linux machine without any network access, only a serial port which is
I need to copy a binary file to a specific location on the target, which is able to then flash some hardware (in this case an FPGA) automatically through a cron job.
I can not really install softwares on the
target, only making small shell scripts.
Do you know of any POSIX shell way I can use to have the same behaviour as scp, but going through the
/dev/ttyUSBx interface instead of ssh?
I thought of using pipes and file redirections to:
cat the binary to
/dev/ttyUSBx from the
- And on the
target, to redirect the stream to the file.
I have no idea of how to even begin. The project I need to use this for is due tomorrow and I am lost right now, any idea would be welcome, very much preferably standard POSIX tools I can use directly from a shell script.
I do have access to gcc on the target, in case the solution needs to be compiled, but I would still prefer a shell solution, since compilation on the
target is awfully slow, and would require more effort to then deploy to multiple machines.
My goal is to automate this workflow (reduce user interaction as much as possible). Maybe something like mounting the
target filesystem as an NFS?