The current Sparkplug plugin does not decode metrics of type 'bytes'. Please find a patch in attachment with a test that exposes this bug.

I will ask Aaron to check this.

Thanks for reporting. I am working on resolving the bug and will will update you!

It turns out there is something else going on to. At some point in history we've decided to use extensions. Now we use metric.byte_value to send a stream of bytes, but with a metric.datatype=29. Current Sparkplug plugin implementation 1. doesn't use value of bytes_value, it return nill. 2. it returns 'Unknown' for datatypes defined in the extension.proto. For point two could we have the plugin return "29" for datatype=29? Then at least client code can act according to the custom datatype. Now I have to use the metric's name to decode data.

For point 1: I am working on a pull request for the fix at the moment. We will then also make sure to log a warning if the data point can't be decoded. For point 2: True that should be a valid workaround if decode_extension is configured