Here the steps, I got Mosquitto up und running on my Windows 8 machine:
During my researches for my home automation project I also stumbled across the MQTT protocol for sensor-server-communication. A matching arduino library was found quickly here on Nick's blog. An arduino sketch was quickly copied from here and modified. Download my version from here.
The MODBUS-slave with the capacitive water level sensor is now mounted inside a die cast aluminium case.
In the previous article regarding the capacitive water level sensor, I've presented two different electrode designs:
Here my findings regarding each electrode.