I have the Seeed GPRS Shield 2.0b. Sending SMS messages and making a call works without any problems. However, receiving SMS messages causes problems. If I execute the AT command AT+CMGL=“REC UNREAD”,1, which should list all unread messages, I get the following output AT+CMGL=“REC UNREAD”,1$$$$OK$$ although I sent an SMS shortly before (I replaced \n\r with $). What am I doing wrong?
Thanks for your help
Could you please give me a screenshot ? This will allow me to understand your problem more intuitively . And I find a AT Command document
<LINK_TEXT text=“https://seeeddoc.github.io/GPRS_Shield_ … _v1.11.pdf”>https://seeeddoc.github.io/GPRS_Shield_V2.0/res/AT_Commands_v1.11.pdf</LINK_TEXT> that may can help you.The AT+CMGL introdution is on page 102 .
I tried again here. First I tried to call someone, which worked without problems. However, if I want to list my SMS messages it does not work. I always send the input with a \n\r at the end. \n\r have been replaced with a $ in the output.