Now the default seems to be EMQX, there's also a possible project to include MQTT5 compatibility in NATS (but they push back because they are selling this in their Entreprise version), what stack do people use here for MQTT?
My company is using mosquito for multi source event stream. This is why I was so confused
We use HiveMQ and some mosquito. Rabbitmq did not have good qos2 support. I would like to see more options in this space. Mosquito did not have good cluster support from my perspective.