GSM continuous data sending problem to server

Projects Programming
1

code given in here

voltage,temp,current,frequency are real time value

String one="a=";
String two=String (one+voltage01);

String three="b=";
String four=String (three+current01);

String five="c=";
String six=String (five+frequency01);

String seven="d=";
String eight=String (seven+stator_temp01);

String nine="e=";
String ten=String (nine+rotor_temp01);

String need="&";

String final01=String (two+need+four+need+six+need+eight+need+ten);

Serial println(final01);

mySerial.println("AT+HTTPPARA="URL","www.imkhalid.info/fazlu/data.php?"+final01+""");
delay(1000);
ShowSerialData();

mySerial.println("AT+HTTPACTION=1");//submit the request
delay(5000);
ShowSerialData();

output

serial monitor shows

a=0.00&b=37.25&c= INF&d=29.63&e=-127.00

AT+HTTPPARA="URL","www.imkhalid.info/fazlu/data.php?a=0.00&b=37

AT+HTTPACTION=1

OK

+HTTPACTION:1,200,0

server only shows this

a=0.00&b=37 .
where the ohers value.is this for GSM 2G feature.
what is the solution of it.

2

What do you see if you do

Serial.println("AT+HTTPPARA=\"URL\",\"www.imkhalid.info/fazlu/data.php?"+final01+"\"");?

Also remember software serial buffer is limited... might want some timing built into what you do

PS: I'd say drop the way you use String object in the first place and use char arrays

3

The sprintf() function will produce the same string without trashing memory. Learn to use it, and forget that the stupid String class even exists.

4

PaulS:
The sprintf() function will produce the same string without trashing memory. Learn to use it, and forget that the stupid String class even exists.

let's say with a bit of strcat() and dtostrf() because he is using floating point data

but I don't think this is his real problem. if you count the number of character in

AT+HTTPPARA="URL","www.imkhalid.info/fazlu/data.php?a=0.00&b=37

you can see this is 64... 64 and Serial ports rings a bell.. or should...

5

you can see this is 64... 64 and Serial ports rings a bell.. or should...

That is being sent out. Sure, it will block when the outgoing buffer gets full. But, that isn't a problem.

OP needs to print to the serial port what is actually being written to the (stupidly named) mySerial instance.

Either the data is correct, or it isn't. Right now, we have no way of knowing.

6

i also tried in this way but,

Arduino compiling error found.
this line .mySerial.println("AT+HTTPPARA="URL","www.imkhalid.info/fazlu/data.php?
a="u"&b="v"&c="w"&d="y"&e="z""");

////////
char u[10];
dtostrf(voltage01,8,2,u);
Serial.println(u);

char v[10];
dtostrf(current01,8,2,v);
Serial.println(v);

char w[10];
dtostrf(frequency01,8,2,w);
Serial.println(w);

char y[10];
dtostrf(stator_temp01,8,2,y);
Serial.println(y);

mySerial.println("AT+HTTPPARA="URL","www.imkhalid.info/fazlu/data.php?
a="u"&b="v"&c="w"&d="y"&e="z""");

delay(1000);
ShowSerialData();
mySerial.println("AT+HTTPACTION=1");//submit the request
delay(10000);
ShowSerialData();
///////

7

PaulS:
That is being sent out. Sure, it will block when the outgoing buffer gets full. But, that isn't a problem.

Yes - but since he is stating that on the server side he is only receiving

server only shows this a=0.00&b=37

that seems to indicate that something is happening with the buffer. as we don't know how this is setup and how often he loops this... wondering how the buffer plays with the dynamic String objects he is playing with...

PaulS:
OP needs to print to the serial port what is actually being written to the (stupidly named) mySerial instance.

Either the data is correct, or it isn't. Right now, we have no way of knowing.

Yes - but may be not enough.

indeed would be on safer grounds with a char array.

8

mySerial.println("AT+HTTPPARA="URL","www.imkhalid.info/fazlu/data.php?
a="u"&b="v"&c="w"&d="y"&e="z""");

You seem to think that some automagic concatenation is going to happen here. It is NOT. Get over it.

char atCommand[120];
sprintf(atCommand, "AT+HTTPPARA=\"URL\",\"www.imkhalid.info/fazlu/data.php?a=%s&b=%s&c=%s&d=%s&e=%s\"", u, v, w, y, z);
modem.println(atCommand);

Notice the meaningful name for the SoftwareSerial instance, instead of the stupid name.

9

problem still remain unsolved . please help me.
I try this way

//////
char u[6];
dtostrf(voltage01,6,2,u);
Serial.println(u);

char v[6];
dtostrf(current01,6,2,v);
Serial.println(v);

char w[6];
dtostrf(frequency01,6,2,w);
Serial.println(w);

char y[6];
dtostrf(stator_temp01,6,2,y);
Serial.println(y);

char z[6];
dtostrf(rotor_temp01,6,2,z);
Serial.println(z);
delay(1000);
char atCommand[120];
sprintf(atCommand, "AT+HTTPPARA="URL","www.imkhalid.info/fazlu/data.php?a=%s&b=%s&c=%s&d=%s&e=%s"", u, v, w, y, z);
gsm.println(atCommand);
delay(1000);
ShowSerialData();

gsm.println("AT+HTTPACTION=1");//submit the request
delay(10000);
ShowSerialData();
////////
Serial monitor result
u= 0.00
v=36.00
w= INF
y= 30.69
z=-127.00
//
SERVER SHOWS
a=
b=
c=
d=0
e=-127.00

i can not find out exact problem.

10

i can not find out exact problem.

You seem incapable of printing the string that you send to the modem to the Serial Monitor app. I really have to wonder why.

It is nearly impossible to fit a 6 character minimum string in a 6 element array and still have room for the terminating NULL. I suspect that you are writing over memory you don't own.

Personally, I'd be concerned about that INF that is printing. Surely you don't expect to put "INF" in a column that expects a float, do you?

11

thanks all of you .

finally i come out successfully having completing this critical/easy task,sending five variable data to web server.