Unserver is a tool aimed to simplify custom HMI development, in particular Web HMI.
Here are some code examples of using Unserver Modbus Communication Software to create web apps integrated with Modbus networks.
Explains how to integrate buttons in a Web app with Unserver.
Here is the full tutorial: Creating HMI with Unserver - Buttons
Explains how to create bar indicators connected to Modbus devices via Unserver.
Here is the full tutorial: Creating HMI with Unserver - Indicators