Designing a Practical IIoT Architecture

Introduction Industrial IoT (IIoT) architectures often look clean in diagrams but become messy when implemented in real systems. While exploring this space, I tried to structure a more practical reference architecture that balances clarity with real-world concerns like scalability, reliability, and multi-tenancy. This is a work in progress, and I’d love feedback from others building similar systems. The Problem with Typical IoT Architectures Most reference architectures: stay too high-level don’t separate concerns clearly (telemetry vs command) ignore multi-tenancy don’t address edge vs cloud trade-offs This creates challenges when moving from POC → production. Proposed Architecture Overview At a high level, the system is divided into four layers: 1. Device & Controller Layer Sensors, controllers, PLCs Communicate via MQTT or similar lightweight protocols Separate channels for telemetry and command 2. Edge Layer Local processing and filtering Handles intermittent connectivity Reduc