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Database Replication, Filtered Synchronization, and Transformation
SymmetricDS is database replication and file synchronization software. It is a platform-independent, web-enabled, and database-agnostic synchronization tool. With initial data load, bidirectional change data capture, conflict resolution, and data transformation, it is a comprehensive data replication solution.
This is a Java application which enables the communication among Vision V350 PLC and Linux server without using OPC server.
In fact there are two applications:
1- TCP_Server which timely receives data sent from PLC
2- TCP_Client which implements the Unitronics ASCII communication protocol allowing an user read and write any PLC registers of Vision V350 model.
CalDAV sync for Android
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Stopped working on it. Doesn't make any sense to spend more time on it; I recommend e.g. DAVdroid as an opensource and ready-to-use solution on clientside.
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For code look at:
https://github.com/e7o-de/android.caldav