[modbus] Do not process values from channel if configured transformation service is unavailable (during startup) about openhab-addons HOT 7 OPEN

I found a workaround, which is not really satisfying, but solves the issue atm. I created a transformation script of the same type which I am using in the thing transformation (JS:|input in my case). This transformation is added as thing > item transformation in the channel. In my case it is a simple passthrough of the value, but rendered through the transformation. The result is an error when the transformation service is unavailable but without passing the raw value to the item.

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Looks very similar to openhab/openhab-core#3763

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@lolodomo True, especially 3763#1745267997 comment nails the issue.

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This issue has been mentioned on openHAB Community. There might be relevant details there:

https://community.openhab.org/t/oh4-transformationservice-of-type-js-is-unavailable/148786/21

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@lolodomo @kaikreuzer Are there any ideas on how to solve this? Is it even possible to influence the order? Is there a dependency management for this?

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This is not a core issue. The SingleValueTransformation is implemented in the modbus-addon. The core ChannelTransformation$TransformationStep is correctly returning an empty Optional for a missing transformation service. I'll move this to openhab-addons.

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Has anybody found a solution to this? It's really bothering at least for modbus add-on (which ususally requires read/write transforms)

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