I have two Z-Wave controllers -- the ISY and a Z-Stick on my Home Assistant RPi. I just noticed today that HA is having issues talking to my secure devices and in going through logs found that it's missing the network key.

Is there a way to extract the network key that the ISY is using on the Z-Wave network? In going through the backups, I see a UZWNDKEY.TXT file, but that has an integer in it, and OpenZWave on HA is looking for a string of hex digits (ex. 0xC0, 0x46, 0xBD, 0x0B, 0x67, 0x89, 0x09, 0x12, 0x33, 0x3D, 0x60, 0x6C, 0x72, 0x71, 0x49, 0xAA). Even if I convert the value in that file to hex, it doesn't give me anywhere near enough bytes of data for a 16-byte key.

I assume it is somewhere in UZWBK001.BIN, but without knowing the format of that file there is no real way for me to track down 16 bytes of a key.

Any suggestions?

13 minutes ago, drich said:

I have two Z-Wave controllers -- the ISY and a Z-Stick on my Home Assistant RPi. I just noticed today that HA is having issues talking to my secure devices and in going through logs found that it's missing the network key.

Is there a way to extract the network key that the ISY is using on the Z-Wave network? In going through the backups, I see a UZWNDKEY.TXT file, but that has an integer in it, and OpenZWave on HA is looking for a string of hex digits (ex. 0xC0, 0x46, 0xBD, 0x0B, 0x67, 0x89, 0x09, 0x12, 0x33, 0x3D, 0x60, 0x6C, 0x72, 0x71, 0x49, 0xAA). Even if I convert the value in that file to hex, it doesn't give me anywhere near enough bytes of data for a 16-byte key.

I assume it is somewhere in UZWBK001.BIN, but without knowing the format of that file there is no real way for me to track down 16 bytes of a key.

Any suggestions?

probably not since that info should be encrypted

Have you tried your Mac address repeated several times?

23 hours ago, Mecheng70 said:

Have you tried your Mac address repeated several times?

I have now :-), but no luck. I tried it both starting and ending with a full MAC as well as a bunch of leading or trailing zeros and the MAC once. All three failed to communicate with my secure devices.

Edited July 12, 20205 yr by drich

So I found a solution: exclude the Z-Stick and include it back using the Z-Wave PC Programmer (formerly ZenSys Tools). It puts the security key in the logs, and it can then be typed into whatever place you need it (you can't cut-n-paste from those logs unfortunately).