Just released new version of MQTT.fx.
Download latest binaries HERE.

New:
– revisited UI (return of “real” buttons)
– extended support for $SYS-topics: subscription for mosquitto or Hive MQ can be choosen (in respect to @dobermai).
– publish and subcrive/receive are now different tabs
– experimental support for http-proxy (in respect to @dimaki123).
– last choosen broker & port is restored at next app start
– updated 3rd party libs (e.g. now using features of ControlsFX 8.0.6)

Fixed:
– publish to topics even if not subscribed before (in respect to @_efwe_)

Hint:
Configuration-format has changed, v0.0.4 might conflict with former versions.
In this case just delete (or rename) the mqttfx-config.xml.
Windows: [USER_HOME]\MQTT-FX\mqttfx-config.xml
OS X: [USER_HOME]/Library/Application Support/MQTT-FX/mqttfx-config.xml
The new configration is automatically created on next app start.