v0.3.3 — Fix USB descriptor (COM port on Windows)

Fix: no COM port on Windows (USB descriptor)

Reported by Dbug on the defence-force forum (p34901): after flashing, no COM port appeared on Windows (LOCI showed "CDC modem mounted", and Linux worked fine).

Cause. The USB configuration descriptor advertised two CDC functions (4 interfaces) while the stack was built with a single CDC (CFG_TUD_CDC=1). So wTotalLength (75 bytes) only covered the first CDC, while bNumInterfaces claimed 4 — an inconsistent descriptor. Windows rejects it (no COM port); Linux tolerates it. The second CDC was non-functional anyway. This bug was present from v0.2.0 through v0.3.2.

Fix. The device is now a single, standard AT-command CDC modem (2 interfaces), so wTotalLength matches bNumInterfaces. Equivalent to the one-byte patch (bNumInterfaces 0x04→0x02) Dbug found. A host-side regression test now guards this invariant.

Downloads

• wifi_modem-v0.3.3.uf2 — flash this (hold BOOTSEL, plug USB, drop onto RPI-RP2). ATI reports Pico WiFi modem v0.3.3.
• PicoWiFiModemUSB-v0.3.3.zip — full bundle: firmware + wificonf.bas + optional CA image + EN/FR manuals + README.txt (flashing for Windows/Linux/macOS).
• PicoWiFiModemUSB-v0.3.3.sha256 — checksums.

No CC65 build required — everything is pre-built.

v0.2.0 — Proxy TLS fonctionnel et validé sur matériel

Première version avec terminaison TLS opérationnelle et vérifiée sur Pico W réel.

Corrections & ajouts

• Correctif : deadlock USB CDC au démarrage (startupWait sans tud_task())
• Ajout : AT$CA= — chargement d'un CA (PEM) par série
• Correctif : vérification TLS inopérante (MBEDTLS_PEM_PARSE_C manquant)
• Correctif : gel du CDC pendant la connexion WiFi (ATC1)
• Durcissement : AT$CV1 refuse sans CA (+ restauration de AT$CA-)

Validation matérielle

• TLS terminé dans le dongle : example.com, google.com (83 Ko), GitHub raw
• Vérification de certificat (badssl) : valides acceptés, expired/self-signed/untrusted-root/wrong.host refusés

Firmware

wifi_modem-v0.2.0.uf2 — Pico W (RP2040). Flasher en maintenant BOOTSEL.