octoturgeandClaude Sonnet 5
94484bb190
README/certs/README/.env.example/printers.example.toml were all still describing this as a learning-stage stub with no real printer protocol clients - rewritten to reflect the real Bambu MQTT client, cert auto-pinning, and marlin serial connection that now exist. - Remove examples/fetch_bambu_cert.rs: its manual fetch-and-save workflow is now what BambuPrinter::connect()'s ensure_trusted does automatically on every connect, so it has no remaining use case. - Fix examples/printer_polymorphism.rs, which no longer compiled - dispatch_gcode was replaced by real methods earlier this session; swapped in print_status() as the vendor-only-extension example. - Remove Config::bambu_ca_cert_overrides/bambu_require_valid_cert and the .env vars documenting them - confirmed dead (nothing read them), fully superseded by printers.toml's per-printer ca_cert_path/ require_valid_cert plus automatic trust-on-first-connect pinning. - Fix stale doc comments in printer/mod.rs and printer/bambu.rs that described certificate trust and MQTT as not built yet, or referencing the now-removed example. No behavior change in the daemon itself - verified with cargo build --examples and a live run of printer_polymorphism and auto_connect_bambu against the real P1P/H2C printers. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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certs/
bambu_ca2.pem
Bambu Lab's shared root CA ("BBL CA2 RSA") used to verify a printer's LAN-mode MQTTS (port 8883) certificate. Current-generation Bambu printers present a certificate signed by (a chain rooted at) this CA - trust this one file instead of fetching/pinning a certificate per printer.
- Source: https://github.com/bambulab/BambuStudio/blob/master/resources/cert/printer.cer
- Fetched: 2026-08-28
- SHA-256 fingerprint:
E9:8F:19:57:8B:3F:12:4A:CE:6B:8A:24:7F:FE:DA:52:DC:99:C8:9F:D4:E7:D2:0C:82:82:99:77:B7:F3:35:02 - Verified with
openssl x509 -noout -text: self-signed (Issuer == Subject),Basic Constraints: CA:TRUE,Key Usage: Certificate Sign, CRL Sign- a genuine root CA, not a per-device leaf certificate. Valid until 2050.
The "CA2" name implies there was a CA1 generation before it, and at least
one current model - P1P - doesn't chain to this root either: BambuStudio's
resources/cert/ only has this one file (plus an unrelated
*.bambulab.com leaf cert for their cloud API), so there's no second
bundled file to grab for P1P. That means it's a genuine per-device
certificate, the same "download it from the printer" case as the older
units. CONTINUUM_BAMBU_CA_CERT_OVERRIDES (see .env.example) is a
per-printer-id map for exactly this - there's no single fleet-wide
override, because different printers can legitimately need different
certificates at the same time.
If a printer's connection ever fails certificate verification against this file, re-fetch from the source URL above (BambuStudio ships whatever the current fleet needs) and update the fingerprint here.
pinned/
Not checked in (gitignored) - where BambuPrinter::ensure_trusted saves a
certificate it auto-pinned via trust-on-first-connect, one file per
printer, named <serial number>.pem. This only happens for a printer
whose certificate doesn't verify against bambu_ca2.pem above (P1P, at
least) and that doesn't already have an explicit ca_cert_path set in
printers.toml - see that method's doc comment in src/printer/bambu.rs
for the full trust-on-first-connect flow, and the SSH-host-key analogy it's
built on. Delete a printer's file here to force it to re-pin (a real
error, not silent, if the certificate it captures the second time still
doesn't verify) the next time it connects.