A sophisticated embedded firmware upgrade solution implementing secure OTA capabilities and fail-safe update mechanisms for mission-critical IoT devices. Built upon a dual-partition architecture that ensures operational continuity throughout the update lifecycle.
- Multi-Channel Update Pathways: Serial XMODEM, Secure MQTT OTA, and Offline Flash Storage
- Robust Partitioning: 64KB flash architecture with dedicated bootloader (20KB) and application (44KB) regions
- Version Control System: EEPROM-based version tracking with comprehensive metadata management
- Security Implementation: Integrity verification through signature validation and secure boot procedures
- State Machine Architecture: Deterministic update flow with fault tolerance and recovery mechanisms
The system employs a state-driven approach to manage the entire firmware lifecycle, leveraging W25Q64 external flash for multi-version storage. Communication with the MQTT broker is established through cellular connectivity, enabling remote deployment across geographically distributed devices.
Designed for industrial applications requiring high reliability and security in resource-constrained environments