The manual fetch_bambu_cert workflow works but needs two commands and a
printers.toml edit. ensure_trusted() collapses that into one call, using
the same trust model SSH uses for host keys:
- a pin already on disk (certs/pinned/<id>.pem) is used directly, no new
trust decision is made on every run
- no pin yet + bundled CA verifies fine (current-gen printers): nothing to
do
- no pin yet + bundled CA fails (P1P, etc.): auto-pins via
trust-on-first-connect, same as fetch_bambu_cert, but automatic
- an *explicit* pin (you set ca_cert_path yourself) never gets silently
auto-pinned over — a failure there is a real error
examples/auto_connect_bambu.rs demonstrates the one-command flow.
Verified all three states against local test servers, not just compiled:
first run with no pin auto-pins and connects; second run against the same
server is silent (no re-TOFU message) and just verifies against the pin;
third run after swapping the server's certificate correctly FAILS instead
of silently re-pinning — confirms the security property survives the
smoother UX.
New:
- printers.example.toml (committed template) / printers.toml (gitignored,
real hosts + access codes don't belong in git) — a list of real printers
with vendor, host, access_code/api_key/com_port, and an optional
per-printer CA override.
- src/fleet.rs loads that file into ready-to-use PrinterHandles, matching
vendor strings to the right constructor.
- BambuPrinter::test_tls_handshake() does a real (blocking, one-shot) TLS
handshake to port 8883 using that printer's configured BambuTls trust
mode — no MQTT protocol, just 'does the certificate verify'. Added
native-tls and toml as direct dependencies for this.
- examples/test_bambu_certs.rs loads printers.toml and runs the handshake
test against every Bambu entry.
Also fixes a real bug found while testing against unreachable IPs: plain
TcpStream::connect has no timeout and hung indefinitely on an offline
printer — switched to connect_timeout (5s).
Verified with cargo check --all-targets (0 errors) and by actually running
test_bambu_certs against a local printers.toml (correctly errored on a
missing cert file, then correctly timed out against unreachable test IPs
instead of hanging).
octoturge
