Overview
A communication stack designed for embedded devices operating in bandwidth-constrained and unreliable network conditions. The system provides consistent telemetry delivery and command acknowledgment across multiple transport layers.
Architecture
The stack implements:
- Transport Abstraction: Unified API across cellular, Wi-Fi, and serial transports
- Message Framing: Efficient binary protocol with CRC validation and sequence tracking
- Retry Logic: Exponential backoff with jitter for congestion avoidance
- State Synchronization: Delta-based updates to minimize bandwidth consumption
Constraints
- Target memory footprint under 32KB RAM
- Support for intermittent connectivity windows
- Multi-client subscription model for telemetry streams
- Graceful degradation when primary transport fails
Outcomes
Deployed across a fleet of embedded devices with measured delivery rates exceeding 99.5% under normal conditions and predictable degradation patterns during network disruption. The abstraction layer reduced transport-switching integration time from weeks to days.