Where can I get TLS certificates?
Services like HTTPS, OpenVPN, MQTT sometimes use TLS certificates for authentication. If you're setting up a custom system, you can generate TLS certificates by yourself with the RUTxxx router or a Linux OS system. Detailed instruction on how to do that are provided in our How to generate TLS certificates? guide.
However, if you're using third party services, for example, a public OpenVPN server, all necessary TLS certificates are usually provided by that party.