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OpENer
OpENer is an EtherNet/IP stack for I/O adapter devices. It supports multiple I/O and explicit connections and includes objects and services for making EtherNet/IP-compliant products as defined in the ODVA specification.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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libplctag
This C library provides a portable and simple API for accessing Allen-Bradley and Modbus PLC data over Ethernet.
So with EIP you essentially have 2 forms of communications (I may have some of the specifics wrong here, but the general info is correct). One is the communication used for IO devices over ethernet, such as a Remote IO. This has a specific minimum rate at which communication has to occur or it will cause an error in the PLC. These devices will show up in your Network / IO Tree. If you want to have the PC mimic one of these devices, you are probably looking at this library https://github.com/EIPStackGroup/OpENer.
The other communciation method is the kind used by HMIs, essentially how your PanelViews talk to PLCs. These devices don't show up in the Network/IO tree on your PLC, and have no guarantees, if the communications fails they fail, but the PLC doesn't have a fault. If this is what you need they probably want to use https://github.com/libplctag/libplctag, in which case all you really need to do on the PLC side is give them some tags to read/write to.