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How to Build a Production-Ready Modbus TCP Poller in .NET Beyond Basic Tutorials

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A detailed guide published on DEV Community outlines what it takes to build a production-grade Modbus TCP polling client in .NET, going well beyond the basic library calls most tutorials cover. Modbus TCP is a request/reply protocol where a client polls devices on a schedule, with data stored across coils, discrete inputs, and 16-bit registers. The article highlights common failure points such as handling unresponsive devices, preventing slow peers from blocking others, and correctly decoding multi-register values like 32-bit floats from big-endian wire format. The author provides sample code using System.Net.Sockets with no external dependencies, while recommending established libraries like FluentModbus or NModbus for actual production framing. Key architectural concerns addressed include connection lifecycle management, per-device polling schedules, typed register decoding, and decoupled data output with sufficient observability.

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