Is your feature request related to a problem? Please describe.
While testing 22.0rc2 external signer feature, I noticed that if multiple HW wallets are connected to the computer, createwallet will always pick the first one without alerting the user in any way. This led to the following unexpected behavior:
- attach a trezor and create a wallet using
bitcoin-cli createwallet - attach a coldcard while the trezor is still connected and create a second wallet with
bitcoin-cli createwallet
Both wallets were created fine with no errors, but on further inspection I realized both wallets were connected to the trezor, despite having different names. This is related to #22635
Describe the solution you’d like
Ideally, if multiple external signers are returned from enumeratesigners and I then try to create a wallet, I would want createwallet to fail and warn me there are multiple external signers. Additionally, an option to specify the fingerprint of the device would be useful, but I think simply failing would be sufficient for now.
Describe alternatives you’ve considered
Granted, this is a rare case where a user would have multiple HW’s connected while creating a single sig wallet, so perhaps just documenting that you should only have one connected at a time is a viable solution.
