Certificates can be downloaded via Device provisioning or directly from the frontend clicking on the three dots near a device and downloading the certificates
client id is things5-production-machine-deviceId, where deviceId is the id of things5 device. Id can be retrieved using Device list or from the frontend.
Warning
If you're using V1 certificates use host mqtt.things5.digital Device provisioning
If you're using V2 certificates use host v2.mqtt.things5.digital Device provisioning V2