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This is an API library for low-cost digital I/O USB dongles with HID interface, made by someone named DCT (search on eBay for "USB I/O data acquisition control module for Smart Home" and such).
The advantage of HID-based interface is that no kernel drivers and no simulated COM-ports are needed. It is easy to detect and address the connected devices.
This repository contains only the software for the host, no device-side firmware and board design.
We are not associated with the manufacturer(s) of these devices or author(s) of the original software offered by eBay merchants. The merchants currently provide only API library for Windows, only in binary form. (The web site dcttech.com does not have a registered owner, and the original software does not contain any contact information).
The firmware of the device is based on V-USB. V-USB enables very simple and low-cost USB hardware solutions.
The project page in the V-USB wiki "USB digital I/O (HID interface)"
Your use of this software is on your own risk.
WE DO NOT ASSUME RESPONSIBILITY FOR ANY DAMAGE.
Binary and source downloads are in Releases.
https://github.com/pavel-a/usb-relay-hid - Software for low-cost USB HID relays