AirCANnect

ESP32 bridge for ResMed AirSense 11 / AirCurve 11 CPAP.

What it does

• Web UI
  • live dashboard with AS11 status and identity
  • read/write all therapy settings
  • live pressure / flow / leak / SpO2 charts
• Time sync
  • NTP-first with AS11 clock fallback
  • Optional AirSense time synchronization - fixes RTC drift issue
• ResMed OTA
  • flash AirSense firmware from web UI or CLI.
    (Autodetects firmware format (raw or .abc container) and target memory block)
• Raw TCP bridge
  • send commands to AirSense over WiFi.
    (one JSON-RPC payload per line, compatible with as11_config.py and other host tooling.)
• Multi-profile Wi-Fi
  • up to four STA profiles, BSSID-targeted roaming, SoftAP auto-fallback or forced always-on.
• Oximetry
  • use supported BLE oximeters or UDP sources with AirSense 11 HR/SpO2 recording
  • currently supported: O2Ring, O2Ring-S, Checkme O2, Nonin 3150, generic PLX/HR sensors

Planned

• Live therapy data sinks - HTTP, SMB, SleepHQ, MQTT... Plugin sinks subscribe through the stream broker; bounded per-consumer queues
• Local EDF capture - record the active therapy session into set of EDF files on own SD card, indexed for remote retrieval over LAN.
• BLE provisioning - replace SoftAP-only first-run with a BLE service for Wi-Fi scan, multi-profile setup, and basic device config from a phone.

First setup

1. Wire up the hardware.
2. Flash: pio run -e xiao-esp32s3-plus-sdmmc4 -t upload
3. Open http://aircannect/ (default login: admin / aircannect).

For a longer walkthrough see the quickstart.

Build profiles

• xiao-esp32s3-plus-sdmmc4 (default) - XIAO ESP32-S3 Plus, 4-bit microSD on the exposed non-strapping GPIOs.
• xiao-esp32s3-plus-sdmmc1 - same board, 1-bit SDMMC.
• xiao-esp32s3-plus-spisd - same board, SPI-mode SD fallback.
• xiao-esp32s3-plus - no SD; PSRAM still available for stream pool and response buffers.

Screenshots

Live charts	Clinical Settings

ResMed OTA	Oximetry

License

AGPL v3. See LICENSE.