Issue with Proxy_url and Proxy_auth

Hey, I'm using smartproxy for my crawling purpose but I have either timeout issues or err 407 issue with the function crawlomatic_curl_exec_utf8. I've tried different configurations in main settings like: - IP/url:port with no auth - IP with auth - IP/url:port with auth But nothing seems to work properly. The data I have in my possession:

<code class="language-php">      $url = 'ip.smartproxy.com/json';
      $proxy = 'http://gate.smartproxy.com'; or http://us.smartproxy.com
      $port = 7000;
      $user = 'XX';
      $psw = 'XXX';

FYI, bBy default (with no proxy and wordpress by default), my scrawl rule is working perfectly)
Can you please be more specific and give examples if possible on the configuration waiting to make sure it works?
Thx a lot for your help,