Dan Langille's Other Diary
He has another, more popular, diary. This one is more general.
Running net/mosquitto on FreeBSD as non-root and with a different pidfile
mosquitto: upgrade from 1.x to 2.x requires configuration changes to keep working
Installing Owntracks recorder on FreeBSD
Using mtqq to create a notification network: mosquitto, mqttwarn, hare, and hared