Create a topic in your MQTT broker by deploying this Custom Resource Definition.
To do so, connect to the OpenShift console, select the namespace of your team and click the + button in the top-right corner. Then, copy and paste the following content.
kind: ActiveMQArtemisAddress
apiVersion: broker.amq.io/v1beta1
metadata:
name: esp8266-out
spec:
addressName: esp8266-out
queueName: myQueue0
routingType: anycast