Minimal Modbus TCP responder that serves holding registers to a PLC or SCADA master.
A tiny, dependency-free implementation of Read Holding Registers (Modbus function code 0x03) over TCP, built directly against the Modbus Application Protocol spec. It is header-only and agnostic about where register values come from, making it well suited to resource-constrained boards where a full Modbus library's RAM and flash overhead is not justified for a single function code. Works with any Ethernet or WiFi transport that exposes the Arduino Client interface.
| Filename | Release Date | File Size |
|---|---|---|
| ModbusResponder-1.0.0.zip | 2026-07-21 | 18.60 KiB |