Every time I have either forgotten to forward a port over SSH, or needed to SSH into another machine first so I could find out what IP and port I needed to forward to, I have closed the SSH session and started a new one with the correct -L or -R option. After all these years I just found out tha...

Mosquitto is an MQTT message broker which has an official docker image. You probably have devices which can publish messages using MQTT (like your electricity smart meter), and want to subscribe to those messages for graphing it using something like telegraf and grafana. The mosquitto_passwd too...