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twislaandClaude Opus 5.5 6b71aace4f
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SSH client: a terminal on another machine (#2)
The SSH App opens one session to a shell, over libssh (LibSSH-ESP32 5.10.0)
on mbedTLS. A server is trusted the first time on its fingerprint, and a
changed key is a warning with Cancel selected. The password is typed each
time and kept nowhere; or the device makes itself an Ed25519 key, whose
public half is shown, written to /ssh/id_ed25519.pub and printed by
`ssh status`.

lib/term is the terminal: what a shell, less, top, nano and vim send, with
sixteen colours, scroll regions, the alternate screen and 100 lines of
scrollback. Five text sizes with Ctrl and + or -, from 60x20 to 26x8, told
to the far end. The session goes on when the App is left; SSH shows in the
Status Bar. `ssh user@host` in the Shell opens the App.

Also:
- Keys that aren't characters carry Shift, Ctrl and Alt. The terminal needs
  it, and it makes Ctrl+Fn+up/down in a note and Shift+Tab in Gemini work
  from the real keyboard.
- IRC doesn't try to connect under 60 KB free: started with a session open,
  its TLS handshake took the heap down to 236 bytes.
- libssh's own curve25519 is left out of the build (scripts/libssh_filter.py):
  libsodium's has the same names.

Costs 292 KB of flash and about 50 KB of heap while a session is open; not
started under 75 KB free.

Docs: guide page, how-to, FAQ, home page, Status Bar, SD card folders, the
memory how-to, README, glossary, N1 notes with Q254 to Q266 and the checks.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EhqxQ49eCju4CzKYNjZzwT
2026-10-08 04:38:36 +02:00

2.1 KiB

+++ title = "Find your files on the SD card" description = "Where the notes, tracks, captures, logs and saved pages are written, so you can take the card to a computer and use them." weight = 2 [extra] tag = "SD card" +++

Everything the firmware writes goes in a folder at the top of the card. To get at it: look at the folders in the Storage App; or open the card in your phone's browser, with nothing to install; or switch the Cardputer off, take the card out and read it in a computer.

What Where Kind of file
Notes /notes .txt, named after the first line
GNSS Tracks /gnss/tracks .gpx, named by date and time
LoRa captures /captures/lora .pcap
IRC logs /irc one text file per buffer and day
Wi-Fi scan logs /wifi/scans <date>.csv
Gemini Saved Pages /gemini/saved/<host>/… .gmi
Gemini bookmarks /gemini/bookmarks.gmi gemtext
Files saved from Gemini that are not text /gemini/downloads whatever they were
Update files /updates .ota
Screenshots (Fn + p) /screenshots .png, named by date and time
The public half of the device's SSH key /ssh/id_ed25519.pub one line, for a server's authorized_keys; safe to copy anywhere
A VPN configuration waiting to be imported /vpn/wg0.conf you put it there; delete it once imported

Rules worth knowing

  • Eject first. A file being written (today's IRC log, a Track or a capture being recorded) is not complete until it stops. Stop it, or switch the device off, before you take the card out.
  • Notes are yours. You can edit them on a computer and they show up on the device; the clean-up never offers them for deletion.
  • Don't rename the top-level folders. The firmware looks for them by name.
  • Logs stop at 90% full, so the remaining space is kept for captures. The Storage App's Maintenance shows what is using the card and clears old logs and captures, after showing what it would free.