Certificates for Mikrotik KNOT Bluetooth gateways

Hi

I’m trying to connect a Mikrotik Knot IOT gateway to the Cloud version of Hivemq

I have other gateways connected successfully but this one is giving me problems because I can’t get it to work with just the CA Certificate.

I tried looking at this documentation, but again it’s expecting a client certificate and key
MQTT/HTTPS and AWS configuration - User manuals - MikroTik Documentation

With no client certificate is complains it’s “unable to get issuer certificate”

Does anyone have any experience connecting a Mikrotik to hivemq cloud?