Hi,
I am trying to accommodate a SIM800 GSM module using UART3 of OP Lite.
For the beginning, just to send a SMS and later on a MMS with a photo taken from gc2035 camera.
This is a source that I made for arduino which works:
Serial.print("AT+CMGS=");
Serial.print(char(34)); //before and after phone nr a char (") must be sent
Serial.print(Phone_nr);
Serial.println(char(34));
delay(100);
Serial.print(message);
delay(100);
Serial.println(char(26)); //end of message char
I have set FEX for the UART3 but now I am struggling to start this using system commands, such as:
echo "AT+CMGS=\r\n" /dev/ttyS3 9600
Any help much aprreciated.