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I have seen reference to this function in the forum and I think it is what I need. I want to send a 4 byte string from my hub to the Z-Uno so I can store it in EEPROM. (The string is a badge ID which is checked when scanning.

I can read the value from EEPROM and check it just fine, I just don't have a way to send a new value remotely.

Is zunosenddbg the right way? If so, how does it get used? There's nothing in the reference documentation

zunoSendDbg is to send from Z-Uno to the hub (and it is a debug tool). But not the wise versa. I suggest to use configuratuon parameters in your case as it suits much better your task.

can I use zunoSendDbg as well to send data to associated nodes?

Yes, but this is hardcore I would suggest to use the standard commands

I would really appreciate if you can point me out to the right direction on how to use it. Let me worry about the Hardcore stuff

This should help you:
https://github.com/Z-Wave-Me/Z-Uno-Core ... e.cpp#L437