Plugin architecture - history

How the plugin set came about. What the plugins are today is in Plugin architecture.

The DDS bridge: a separate image, then the ordinary one

The DDS bridge links 21.4 MiB over nine libraries against the broker's own 4.28 MiB over three — which is why it was a separate image for a while, and why it is not one any more: an image that carries it and never loads it costs that and nothing else.

MQTT out of the broker

MQTT moved into the mqtt bridge plugin, in corMqttBridge; the broker itself no longer links libmosquitto.