I've managed to save into the custom preset slots using the Windows Focuser Manager 1.3 and the Virtual HandPad web app as well as through the INDI driver code. However, irrespective of the client used, actually loading/applying one of the custom presets always fails for me with:

{"res":{"cmd":{"RUNPRESET":"Error: empty preset"}}}

I checked this in the Virtual HandPad web app by setting a breakpoint where the JSON command is sent to the REST endpoint. The same error result is seen in this as when using the serial interface.

I'm hoping to hear back this week, but if it takes any longer I'll just create a pull request without the custom preset functionality since it actually achieves what I needed and perhaps I can add it later once a firmware fix is available.

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