MQTT Client :
- Multiple topic (one click subscribe / unsubscribe)
- One click publication replay
- Publication filter
- Display publication in hexadecimal if the program guess that the payload is not UTF8
- Save a publication payload to a file
- Allow to publish from a file
- Automatically detect image publication (PNG/GIF/JPEG) then display a thumbnail
- Multiple configuration supported for connection
- Function related to publication : Delete one publication, delete all publication on one level, copy payload, view payload in hexadecimal
- Publish in hexadecimal / utf-8
- Run as a service, can still receive publications while in background
- Basic statistics : Total payload received, total message received.
- Support notification on topic change
- Support basic secure connection (no client certificate)
- IPv6 support

Any suggestion to improve the program are welcome !