Hi! Im not familiar with the Wifi so might be a stupid question - but is Wifi gateway supported by Domoticz? (Does it work the same way as Ethernet gw?)... Adding a serial gateway and ethernet gateway to hardware you have to change the settings in your hardware menu.

You could probably simplify this sketch a bit... Look in the debug log and check it sends any temp data... If not, add debug in some locations until you find the problem. For instance what temp value you actually get when reading it from the dallas sensor.