AltSoftSerial and esp8266-01 - how to wire?

Hi, I’m doing some try with the esp8266-01 module wired to Arduino UNO as in the diagram below and using as library the AltSoftSerial. But on friday last week it’s happened something… strange! In the morning it worked perfectly, in afternoon sometime, and in the evening definitely no.
I tried to change all the cables because I thought that was a problem of them, but it’s not this!
I also thought I’ve accidentally changed the code, so I tried with an example sketch (in attachment) but I got the same result…
Someone has already tried to connect the esp using this library? If so, can you post the diagram? Thanks

provaAltSerial.ino (989 Bytes)