v0.3.1

Changes since v0.3.0

• EDF generation overhaul — replaced protobuf event parsing with JSON events.snt stream for EVE/CSL.edf generation. Sessions with invalid timestamps from crash-recovery 0-byte .snt files are now skipped instead of producing corrupt EDF output.
• Custom NTP server — configurable via WebUI, saved to NVS; overrides DHCP/default servers when set
• Initial NTP sync enforcement — 3 attempts (~45s), failure triggers screen message + audible alarm (5×1s beeps) + hard reboot
• ES8311 audio driver — clean-room I2C+I2S implementation for beep tone generation (bsp_audio.c/h)
  • Fixed I2C address (8-bit 0x30 → 7-bit 0x18)
  • Fixed I2S DOUT/DIN pin swap (IO12/IO11)
  • Bus probe with full scan fallback for diagnostics
• SD card display — condensed free space format
• Log rotation — increased to 512 KB (4×128 KB), fixed path separator bugs

Upgrade notes for v0.3.1

Recommended actions after upgrading

1. Recreate EDF files — Use the WebUI action "Recreate EDFs". This
   deletes all existing EDFs in SDCARD/ and regenerates them from the
   .snt stream files using the new JSON event parser. Sessions with
   invalid timestamps (from crash-recovery 0-byte .snt files) are now
   skipped automatically.

   Warning: Recreating EDFs resets the uploader state and triggers a
   full re-upload of all EDF files to SMB/SleepHQ. If you have a large
   session history, this may take a long time and consume significant
   bandwidth.

2. Delete stale log files — Previous firmware versions wrote log
   files (somnotrace.log.*) to the SD card root. These are now stored
   in /.logs/. The old root-level log files can be safely deleted
   manually to free SD card space.

3. Configure NTP server (optional) — A custom NTP server can now be
   set via the WebUI WiFi/Timezone page. If set, it overrides DHCP-provided
   and default public NTP servers. This is useful for restricted networks
   or offline setups with a local NTP server.

Notes

• The initial NTP sync is now mandatory — if it fails after 3 attempts
  (~45s), the device will beep (5×1s), display "NTP Sync Failed", and
  reboot. Ensure your NTP server is reachable.
• No firmware settings are lost during upgrade (NVS partition preserved).