Hi @Murali ,
It is great that you are interested in MQTT and HiveMQ! Welcome to our community.
From your questions it looks that your device requires a server CA file to connect via TLS. How can you generate this for your HiveMQ Cloud instance?
You can download the root certificate here .
This will create a file called “isrgrootx1.pem”, which you can use as “Server Certiciate”.
What else is required? We require the TLS-SNI extension to be available and used. Please refer to this post, if you want to learn where to check if TLS-SNI extension is turned On in your SSL configuration: Client is not authorized to connect - #37 by simon_b
I hope this helps,
Dasha from HiveMQ team.