I want SubscribeEdgesChannels in UI WebSocket

1

Dear OpenEMS community,

I need to subscribe to channels distributed across multiple Edges from a custom UI, and have three questions:

  1. Why is SubscribeEdgesChannels (supports multiple Edges) restricted to B2B WebSockets?

  2. SubscribeChannels (an edgeRpc method) works in UI WebSockets, but doesn’t support multi-Edge subscriptions. Is there a reason this limitation exists?

  3. Can moving SubscribeEdgesChannelsRequest/SubscribeEdgesChannelsNotification to backend.common enable UI WebSocket support?

    → If yes, could you provide guidance on the implementation steps?

Thank you in advance.

2

Hi. We somehow had this requirement in mind, that’s why there are some basic implementations for it. We did not require that feature in OpenEMS UI yet, though - so we did not implement it till now. Specifically in UI the Angular lifecycle events are often not reliable, which would lead to forgotton unsubscribes after switching to a different Edge, so it was easier to implement this way.

If you can provide a small PR, we’ll certainly look into it.

Regards,
Stefan