网上OPC UA服务端的介绍非常少，网关的更是找不到，找到的几乎都是收费的，最近静下心把OPC基金会的代码学习了一遍，结合一些大牛的文章，写了一个简单的OPC UA网关。目前网关的设备只支持西门子，因为只有西门子的仿真器足够强大（S7协议可以仿真），后续根据条件会加上三菱、欧姆龙等等。
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