* added warnings from firmware for simple channel setting mistakes * more and better checks * one ping only * Drop literal 'AQ==' from blank-PSK channel warnings The base64 encoding of the default channel key isn't something a user should type in by hand; state the condition instead of a raw key value. --------- Co-authored-by: Ben Meadors <benmmeadors@gmail.com> Co-authored-by: Claude <noreply@anthropic.com>