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serterm: Deploy serial terminal server

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The serial terminal server ("serterm") is a collection of scripts that
automate launching multiple `picocom` processes, one per USB-serial
adapter connected to the system.  Each `picocom` process has its own
window in a `tmux` session, which is accessible via SSH on a dedicated
port (20022).  Clients connecting to that SSH server will be
automatically attached to the `tmux` session, allowing them to access
the serial terminal server quickly and easily.  The SSH server only
allows public-key authentication, so the authorized keys have to be
pre-configured.

In addition to automatically launching `picocom` windows for each serial
port when the terminal server starts, ports that are added (hot-plugged)
while the server is running will have windows created for them
automatically, by way of a udev rule.

Each `picocom` process is configured to log communications with its
respective serial port.  This may be useful, for example, to find
diagnostic messages that may not be captured by the `tmux` scrollback
buffer.
This commit is contained in:
Dustin
2024-03-21 21:24:12 -05:00
parent 9779ac795d
commit d989994f25
9 changed files with 107 additions and 0 deletions
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env/prod/serterm.cue vendored Normal file
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package prod
import "du5t1n.me/cfg/app/serterm/schema"
serterm: schema.#SerTerm
serterm: ssh: authorized_keys: [
"sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAINZCN2cxMDwedJ1Ke23Z3CZRcOYjqW8fFqsooRus7RK0AAAABHNzaDo= dustin@rosalina.pyrocufflink.blue",
"sk-ssh-ed25519@openssh.com AAAAGnNrLXNzaC1lZDI1NTE5QG9wZW5zc2guY29tAAAAIAB6xTCSNz+AcQCWcyVKs84tThXN4wpLgCo2Lc48L6EsAAAABHNzaDo= dustin@luma.pyrocufflink.blue",
]