With the below code for receiving SMS and the exact same connection to Arduino Nano, I am testing A6 and SIM900 modules. Both modules deliver full SMS message on the serial port to Nano.
Problem: With A6 connected to the Nano, the software serial port do not include the SMS message BUT include +CIEV?
(With SIM900 connected to the Nano, the software serial include the SMS message).
An AT+CMER=? test of both GSM modules shows a (maby important) differences:
A6 module. +CMER=0,0,0,0,0
SIM900. +CMER=3,0,0,2
The A6 module do not allow changing the values of +CMER!
This is the programme sketch:
#include <SoftwareSerial.h>
//Create software serial object to communicate with A6
SoftwareSerial mySerial(3,2); //A6 Tx & Rx is connected to Arduino #3 & #2
void setup()
{
//Begin serial communication with Arduino and Arduino IDE (Serial Monitor)
Serial.begin(19200);
//Begin serial communication with Arduino and A6
mySerial.begin(19200);
Serial.println("Initializing...");
delay(1000);
mySerial.println("AT"); //Once the handshake test is successful, it will back to OK
updateSerial();
mySerial.println("AT+CMGF=1"); // Configuring TEXT mode
updateSerial();
mySerial.println("AT+CNMI=1,2,0,0,0\r"); // Decides how newly arrived SMS messages should be handled
updateSerial();
}
void loop()
{
updateSerial();
}
void updateSerial()
{
delay(500);
while (Serial.available())
{
mySerial.write(Serial.read());//Forward what Serial received to Software Serial Port
}
while(mySerial.available()>0)
{
Serial.write(mySerial.read());//Forward what Software Serial received to Serial Port
}
}
The test setup is standard, but it appears that the lenght of the data stream to be handled by Arduino, have somme influence.
Can some boddy help ??????
