Hello! Try this:

use strict;
use Mojo::UserAgent;

my $ua = Mojo::UserAgent->new;

my $url = "ws://some.url/path";

my $globals;

my $connect_ws;
$connect_ws = sub {
  my ($ua, $tx) = @_;

  $tx->on(json => sub {
    my ($tx, $json) = @_;
    # populate $globals here and listen for $opcode = 7
    #
    if ($opcode eq 7) {
      $tx->finish();
    }
  });

  $tx->on(finish => sub {
      my ($ws, $code, $reason) = @_;
      print "WebSocket closed with status $code. $reason\n";
      $ua->websocket($url => $connect_ws);
    });
    
   # if we have some globals, then we're resuming - send tokens etc
   if ($globals) {
     $tx->send({ json => $globals })
   }
};
$ua->websocket($url => $connect_ws);

Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
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Maybe this answer will tell you more: https://stackoverflow.com/a/70136684