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united-manufacturing-hub / benthos-umh

Apache License 2.0
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[Feature Request] Support auto discovery and data retrieval from all available OPC PLC nodes. #17

Closed devantler closed 11 months ago

devantler commented 11 months ago

I have a use case where I need to retrieve all data available from all nodes on an OPC PLC Server. Currently, this requires adding an entry to the nodeIds array for each node that I require data from. This does not support my use case, where available nodes might change over time, and the entries should either be deleted or added accordingly.

@JeremyTheocharis and co do you have anything planned for a feature like this, and if so, could we collaborate towards a solution? If your lead time for implementing a feature like this is long, I can help out as I need the solution as soon as possible. But if so, I will need some guidance to make sure the solution meets your expectations and goals for how the benthos-umh should function.

JeremyTheocharis commented 11 months ago

This feature is already in there! Just add the parent node and it will browse (and subscribe) to the rest

devantler commented 11 months ago

@JeremyTheocharis Wauw, this is great news! 🙌🏻 How do I do that? Does the parent node have a specific nodeID that I need to use?

JeremyTheocharis commented 11 months ago

For example for our WAGO PLC you can use either ns=4;s=|var|WAGO 750-8101 PFC100 CS 2ETH.Application.GVL or specify the node directly ns=4;s=|var|WAGO 750-8101 PFC100 CS 2ETH.Application.GVL.rTemp_DegC

This is how it looks like in UAExpert image

I think when using i=84 as Node-ID, it should browse the entire thing and susbcribe to everyhting. but that might take some while

devantler commented 11 months ago

Thanks! I will look into how this works best for my chosen OPC UA servers :-) The one I am running atm is for testing so it might be enough with ns=0;i=84 :-)