My first bitcoin transaction with core and coldcard I use coldcard and bitcoin core 0.20.1. I have checked how to do it with HWI at https://github.com/bitcoin-core/HWI/blob/master/docs/bitcoin-core-usage.md.
It appears more complex than needed.
With the core's GUI, I can create a PSBT, save it, and then sign it with an SD card and coldcard. The latter will create a TXN file with the finalized transaction, that I can just broadcast with core.
No need for HWI and only 1 console command (sendrawtransaction) needed.
I am afraid: am I missing something?
Thank you for any suggestion.
That is a viable method for using a Coldcard with Bitcoin Core. HWI is intended for the case where the hardware wallet is plugged into the machine running your wallet software. For the Coldcard, it is just an alternate way to use it. However for other hardware wallets, the MicroSD card method is not available so HWI provides a way to use them with Core.