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What is SDK 4.24?

Many of my devices are listing this as the SDK... Eg: Fibaro FGS-223...

Any ideas?

This is the version of the zwave library used by the device's firmware. SDK stands for "Software Development Kit".

I know what SDK is.

I was not (until now) aware the difference between SDK and serial API (eg: 6.71 vs 4.24).

Thanks!

They are unrelated numbering. The SDK numbering is from silabs. The serial API is a client application versioning and varies by vendor.