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ANX OS is the factory firmware that ships on every ANX development module. It provides a complete, production-ready software foundation — real-time task scheduling, wireless connectivity, persistent storage, and over-the-air update support — so you can focus on building your application instead of writing low-level board support packages and peripheral drivers from scratch. Whether you are prototyping a sensor node or shipping a connected product, ANX OS gives you a stable, well-tested base to build on.

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What ANX OS Includes

Real-Time Kernel

A FreeRTOS-based preemptive multitasking kernel with deterministic interrupt latency, configurable task priorities, and software timers. Handles all context switching so your application tasks run in isolation.

Wi-Fi Stack

Full IEEE 802.11 b/g/n support with WPA2 and WPA3 authentication, DHCP client and server, DNS resolver, and a TLS 1.3 library for encrypted connections. Station, access-point, and mixed modes are all supported.

BLE Stack

Bluetooth 5.0 compliant stack exposing GATT server and client APIs, GAP advertising and scanning, and connection parameter negotiation. Supports simultaneous BLE and Wi-Fi operation.

File System

LittleFS on SPI Flash with hardware-level wear-leveling and power-loss resilience. Provides a POSIX-style file API for storing configuration, logs, and application data across reboots.

OTA Update Engine

Delta update downloads that minimize bandwidth, cryptographic signature verification, dual-partition rollback, and health-check enforcement. Keeps deployed devices up to date without a physical USB connection.

ANX SDK Integration

Native peripheral drivers for UART, SPI, I2C, PWM, ADC, and GPIO, plus higher-level networking and device management APIs. The SDK links directly against the firmware, so there are no compatibility shims.

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Firmware Versions

ANX OS follows semantic versioning (MAJOR.MINOR.PATCH):
  • MAJOR — incompatible API or on-wire protocol changes.
  • MINOR — new features added in a backward-compatible way.
  • PATCH — backward-compatible bug fixes and security patches.
To check the firmware version currently running on your connected module, run:
The output includes a Firmware field that shows the version number and the release channel it came from:

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Release Channels

ANX OS firmware is distributed across three release channels. Choose the channel that matches your project’s risk tolerance. Switch channels at any time through the ota.channel field in your device’s config.json, or by passing --channel to the anx flash command.
Always verify that your ANX SDK version is compatible with the firmware running on your device. The SDK documentation lists a minimum firmware version for each release. Running a mismatched combination can cause undefined behavior or failed API calls. Check compatibility with anx doctor before starting a new project.