I have a problem configuring the device. I can not send AT commands(I get no response back) and I have controlled the connections several times and I observed with a multimeter that the connections are complete. I use the USB-Serial adapter which I use with other devices with no problem. After failing, I tried to communicate via Arduino as well and it again didn’t work. Is there anything else I can do or is there a possibility that there is a problem with the device?
Sadly I don’t have a solution however I was wondering if you made any progress with this issue, as I am running into a similar one?