Which certificate to embed into ESP32?

[Alizzzz]

I'm reading very different things about certificates in IoT. I'm struggling to make a choice on how to manage this.

Here's the situation:

- I'm using ESP32
- I don't have much storage available
- I need to send data to a server through HTTPS
- I need to receive data from this same server
- I'm using Let's Encrypt on server's side
- I can do OTA updates but I'd like to avoid it the most possible

Which certificate do I have to embed into ESP32?

[stoikos]

the certificate chain that validates your server certificate. Most likely the root certificate from lets encrypt + any intermediate used to singe it. look at https://stackoverflow.com/questions/254 ... ssl-verify

you dont need to embed the certifcate from your server.