Letsencrypt Certificate Renwal - Questions

Hi there,
I have a question regarding using Lets encrypt to manage the certificate. My question is regarding when it is time to renew the certificate.

We are planning to connect to EMQX using MQTT TLS. This means that we need to transfer the generated certificate to all IOT Devices. What happens when the certificate is renewed? Do we need to update the certificate in all IOT devices? This does not sound correct to me?

Can anyone sate instructions regarding the best practices here?

Thanks in advance

Please ignore. This does not make sense.

If it is one-way authentication, you only need to update the server certificate.

In addition, you can complete the inspection of expired certificates through the CRL and OCSP Stapling functions provided by EMQX.