I gave up trying to set the openhab.. mosquitto and all that on my Rpi, honestly I am very new on the rpi and linux.. that is fact ..but other side there is not easy guide to follow in order to install successfully the openhab + mosquitto +my sensors. I have spent a sum of 12 hours without getting to much valuable. Instead I have decided to go to Domotic Z I have followed that guide https://www.domoticz.com/wiki/Domoticz_RaspberryPi_SD_Image , it took me 1 hour to set up everything and now I have fully working my ESP8266 gateway sending my sensors data to domoticZ on my RPI, just follow that link and you'll get domotic z installed on your rpi.