Vhost support on mosquitto_sub client

When connecting via mostquitto_sub to a RMQ which has virtual hosts, how does one specify that?

MQTT doesn’t have the concept of virtual hosts, so you need to handle it differently in RabbitMQ. The documentation discusses this: MQTT Plugin — RabbitMQ

The mosquitto clients do set an SNI host when using TLS, so you may be able to make use of that.