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  1. or download this
    ...
use IO::Socket::SSL;
...
   SSL_verify_mode => 0,
)->get_fingerprint,"\n";
...
  2. or download this
    ...
my $mqtt = Net::MQTT::Simple::SSL->new("203.0.113.46:8883", {
...
   SSL_key_file  => "$cpath/notifications-client.key",
   SSL_fingerprint => 'sha256$a...2',});
...
  3. or download this
    openssl x509 -fingerprint -sha256 \
    -in /etc/mosquitto/certs/server.crt \
| sed -n -e '/Fingerprint/ { s/ .*=/$/; s/://g; p; }'