Mosquitto was available for installing a few versions ago, but was ended, apparently, because of problems with LibreSSL. In a previous version @poupin claimed that it could be installed directly from the FreeBSD repos, and claimed that it worked (https://forum.opnsense.org/index.php?topic=14388.0 (https://forum.opnsense.org/index.php?topic=14388.0)).
Is this advisable, or is it likely to break sometimes?
Hi,
It's not advisable, although sometimes it might work but there's no guaranteed ABI compatibility between FreeBSD and OPNsense (which uses HardenedBSD as base system).
Building locally from the ports repository is the recommended way to add custom software (https://docs.opnsense.org/manual/software_included.html#packages-pkg)
Best regards,
Ad
OK. Thanks!