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MRL Library Collection
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This is a collection of libraries either written by MRL or enhanced by MRL
Utility - A collection of utility routines that include XML document as object tree, statistics, tracing and property tree template class
MrlModbus - Qt wrapper for libModbus
QtSsrcSpread - Qt wrapper and enhanced for the Ssrc Spread messaging system (spread.org) plus message handling and RPC over Spread
MrlHardware - packet driver classes. This is for send response protocols eg MODBUS ASCII.
LuaPropertyTree - This is a tree class that stores variant values with attributes. Each item in the tree can be assigned a type which then keys
how it is edited, viewed and displayed. values in the tree can have active objects stored with them. Lua can be used to script additional functionality.
LuaPropertyEditor and LuaPropertyServer are worked examples of how to use Spread and LuaPropertyTree to impliment a distributed object system.
Other stratergies that work are subscriber-publish. Each Spread group can be viewed as a namespace that has its own protocols.
It is quite easy to create something analogous to OPC.
How to build
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Build using Qt Creator and Qt5
You will need Spread, libModbus, Qxt, QtLua and Qwt built and installed.
MRL.pri has the destination paths - edit to suite your site
Build and install Utility first