If it were me, and it ain't, I would start clean with my own code. An RTD needs an amplifier, but it's still a pretty easy setup. Have a look at this post which has someone making the RTD sensor/amplifier work, and then this project which does pretty much everything you want but with the wrong sensor. Merge those two together and Bob's your uncle.
I think if you want to get fancy and you Google "ESP8266 temperature monitor smoking" you will find some interesting stuff like this project which is half baked but a potential source of information.