I still have the same problem. It does not send me any error message. I connect them correctly, and I have bought a voltage adapter so that I do not burn the modules. In addition, it comes with a capacitor inside. Therefore, I doubt that the problem is there.
The message that I was trying to send was received, but only once. What can the problem be? Does this module produce a lot of errors? Is there any modules or different ways of wireless communication that does not produce so many errors?