wallet register does not return hmac

[chuber11]

Hello,

I compiled the async-hwi code (commit 1160dc2) on Windows using
rustc --version
rustc 1.88.0 (6b00bc388 2025-06-23)

When I register a wallet on my BitBox02 using

hwi.exe wallet register --name "Wallet" --policy "Descriptor"

I get an empy string as result and not the hmac. Any idea what the problem could be?

[pythcoiner]

only ledger return a Proof Of Registration (HMAC), other devices are statefull and store the descriptor.

Beware with bitbox, as there is actually no way to remove a registered descriptor and as the max number of registered descriptor is 25, if you hit the limit you'll have to factory reset the device

[chuber11]

thanks for the clarification.
One more question: Currently I have to acknowledge/verify the pairing code every time I use hwi.exe (and I don't know how to show it on the PC). Is there a way to only show the confirmation code once?

[pythcoiner]

This feature is not implemented in the CLI, the noise config must be stored by the consumer, you can have a look at how it's done in Liana:

https://github.com/wizardsardine/liana/blob/f70aa75c5508b1ed06f92c00535a62879419dd3b/liana-gui/src/hw.rs#L557