Hi, just want to know if I must add certificates to /etc/loraserver/loraserver.toml and /etc/lora-app-server/lora-app-server.toml even if I don’t need consider API security for beginning.
For beginning, I just want to test the whole system works, then add certificates later. Is that okay?
Yes, it is ok to leave the certificate fields blank. Non of the certificates are mandatory. You might also be interested in following this guide: https://www.loraserver.io/guides/docker-compose/. The linked repository contains the most basic configuration files for all components 
Also https://www.loraserver.io/guides/debian-ubuntu/ might help you.