@SiLeX So it may be due to an incorrect connection? Pins of module are untagged and I connected them according to the positions of schemes that I found online. All modules have same pinout?
You should not typ "\n"!
It means that you should press enter on your keyboard.
On Linux I saw that I have to send "\r\n" instead of "\n".
"\r\n" (Carriage return, Line feed) is the Windows return, "\n" only the Linux return.
