THGN132N support #4

I have a THN132N (channel 1) and a THGN132N (channel 2) and the test script does not find anything for me either.
I can send and receive codes with the 433Utils repo, so my set-up is working (433Utils uses pin GPIO 27 as opposed GPIO 18 —but setting RXPIN to 2 in test.cpp ought to make them the same). The 433Utils works both using 5V with the resistors (and LED) as described by Disk91 or with 3.3V normally with signals sent by another pi (with the transmitter, i.e. the square board).