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I'm trying to connect an Arduino Nano 33 to an mqtt broker with TLS authenticaton on the broker side. To do that I need my Arduino board to have access to the the root certificate.

My understanding is that unlike ESP32, the Nano's NINA wifi module does not have a WiFiSSLClient object with a setCACert method that you can use to pass the root certificate. Instead, the NINA's client has a connectSSL() method which uses whatever root certificate you have uploaded to the Nano using Arduino's IDE. However, as it can bee seen in this tutorial, it looks like it is only possible to upload public domain root certificates by entering the website.

But what if I wanted to upload a root certificate that I have generated using OpenSSL. Would that be possible?

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