HiveMQ configuration

I’m trying to configure HiveMQ since Mosquitto is broken (Mosquitto 5.1.1 is broken. · Issue #1887 · home-assistant/addons · GitHub)

I have read here MQTT Broker - Home Assistant and this is the “example” configuration

mqtt:
  broker: "HIVEMQ_BROKER_HOSTNAME"
  port: 8883
  username: "MQTT_USERNAME"
  password: "MQTT_PASSWORD"
  certificate: PATH_TO_STORED_CERTIFICATE

This is my configuration

mqtt:
  broker: "blablabla.s1.eu.hivemq.cloud"
  port: 8883
  username: "blablabla"
  password: "blablabla"
  certificate: '/config/trustid-x3-root.pem'

It’s not working, obviously I am pretty sure the path I’ve copied the certificate to needs to be specified in a very specific way and I cannot possibly try all the permutations; hopefully someone will correct it if it’s wrong

trustid-x3-root.pem this certificate has expired
So try this certificate https://letsencrypt.org/certs/isrgrootx1.pem
An add tls_insecure: true in your config.yml