I've got a big problem with the communication between Sim7600e-4G-hat and Arduino (Uno/Mega).
If I connect the SIM-shield direct via USB with the PC and run the SScom or Hercules-software I can send SMS to a Handy.
When I connect the shield with the Arduino, after upload the relevant sketch, it doesn't work.
I connected the SIM exactly like in examples with the UNO/Mega !
I tried different Jumper position, changed TX/RX and tried different Power-supply at the Arduino (5-9V 2.2A). Also the 9600 bytes are correct.
Also interesting could be, if I connect the PC via FTDI with the SIM, the sending from SMS works, when the Jumper at the B-B position. In the C-C position it don't work.
I contacted the Waveshare-Support for many times, but the reply was't helpfull.
Curious is that without the Arduino it works, but not with! Therefore I tried different other Arduino boards.
So do have anybody an idea, what could be the reason of that?
I many, many hours of time to solve the problem and now I'm at the end.
It would be very very nice, if anyone could give me a hint what cause that problem.
Thank you very much in advance for your help.
kindly regards, Joerg