Yes, Piwik PRO uses HTTP Strict Transport Security (HSTS) to secure your web traffic. The HSTS makes sure that your website or app communicates with Piwik PRO through a secure https:// connection.
You don’t have to set anything up. Piwik PRO automatically uses HSTS and rejects tracking requests sent from unsecure http:// connections.
Some firewalls can block https:// connections. If a visitor enters your site from behind such firewall, then their session won’t be recorded.