ROUGH ANALYSIS
After all declarations and initializations the first active part of the entire code is the for loop that just deletes all former messages from the sim card memory.it runs 15 times
for (int i = 1; i <= 15; i++)
{
GPRS.print("AT+CMGD=");
GPRS.println(i);
delay(300);
while(GPRS.available())
Serial.write(GPRS.read());
}
Now, having functions GSM_NUM1(); GPSAnalyzer(); sendSMS();
Which are defined below in the code
GSM_NUM1(); GPSAnalyzer(); both work similarly they extract needed data which come in separated by commas. For the gps which comes in , in the form
+UGNSINF: ,,<UTC date & Time>,,,
,,, ,,,,,,,
,,<C/N0 max>,,
lathitude, speed and any other important parameter is extracted.
For GSM_NUM1(); it gets the senders message and number into variable.
sendSMS(); this just does some calculation based on the message received and send a certain result to the number who requested it.
OBERVATIONS
When the program starts nothing happens which is good cause nothing is supposed to until something new comes in.
Hence the
void loop()
{
while(GPRS.available()) //ONLY WHEN THERE IS SOMETHING AVAILABLE,
{
GSM_NUM1(GPRS.read());
//delay(50);
GPRS.println("AT+CGNSINF");
// delay(40);
GPSAnalyzer(GPRS.read());
sendSMS();
}
Now this is were things go bad, as the first function works good, it waits gets the message and extracts the senders number and message”key” into variables but immediately after that I wantjust one return of the gps info shown below that’s why I used ("AT+CGNSINF"); instead of ("AT+CGNSURC=1"); as the later gives continuous gps data such as
+UGNSINF: ,,<UTC date & Time>,,,
,,, ,,,,,,,
,,<C/N0 max>,,
BUT instead of one line of the gps data to be gotten from were lathitude and some other parameters are extracted into variables “THE PROGRAM HANGS/STOPS for some unknown reason.
SUSPICIONS
Since the SIM808 possess gps/gsm on the same module. It makes it kind of tricky to separate them in the sense that.
IF I WANT THE GPS TO BE ON BUT NOT READ IN ANY DATA UNTIL A VALID REQUEST COMES IN , IN FORM OF AN SMS THEN THE NECESSARY GPS INFORMATION IS PARSED AND SOME CALCULATIONS ARE DONE TO GET A PARAMETER THAT WOULD BE SENT TO THE SAME NUMBER THAT REQUESTED IT.
PERSONNALY, I FEEL THAT GETTING THE GPS AND GSM TO WORK HAND IN HAND WITHOUT CANCELLING EACH OTHER OUT IN SOME WAY,SUCESSFULLY WOULD BE THE END OF MY PROBLEM. AND I THINK IT COMES DOWN TO THE POSITION OF THE AT COMMAND
GPRS.println("AT+CGNSURC=1"); AND/OR GPRS.println("AT+CGNSINF");
AS the former spits out the gps data every GNSS FIX continuously when called once and LATER spits it out just once per one command.
the attached picture just shows the continous nature of the output of ("AT+CGNSURC=1"); , just as ("AT+CGNSINF"); spits out just one line with +CGNSINF: at the begining instead.
post_to_ccc.ino (10.1 KB)
