Problem in SIM900 GPRS connection

Question

I make simple code to read web page by ITEAD Gboard. Here is my code:

 Serial.write("\nStarting..........\n");
 mySerial.print("AT+CSQ");
 delay(1000);
 while(mySerial.available()!=0)
 Serial.write(mySerial.read());
 Serial.write("\n-----1-----\n");
 mySerial.println("AT+CGATT=1");
 delay(1000);
 while(mySerial.available()!=0)
 Serial.write(mySerial.read());
 Serial.write("\n-----2-----\n");
 mySerial.println("AT+CGATT?");
 delay(1000);
 while(mySerial.available()!=0)
 Serial.write(mySerial.read()); 
 Serial.write("\n-----3-----\n");
 mySerial.print("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"");
 delay(1000);
 while(mySerial.available()!=0)
 Serial.write(mySerial.read());
 Serial.write("\n-----4-----\n");
 mySerial.print("AT+SAPBR=3,1,\"APN\",\"internet\"");
 delay(2000);
 while(mySerial.available()!=0)
 Serial.write(mySerial.read());
 Serial.write("\n-----5-----\n");
 mySerial.print("AT+SAPBR=1,1");
 delay(1000);
 while(mySerial.available()!=0)
 Serial.write(mySerial.read());
 Serial.write("\n-----6-----\n");
 mySerial.print("AT+HTTPINIT");
 delay(1000);
 while(mySerial.available()!=0)
 Serial.write(mySerial.read());
 Serial.write("\n-----7-----\n");
 mySerial.print("AT+HTTPPARA=\"URL\",\"xx.xx.xx.xx/my/web/site\"");
 delay(1000);
 while(mySerial.available()!=0)
 Serial.write(mySerial.read());
 Serial.write("\n-----8-----\n");
 mySerial.print("AT+HTTPDATA=100,1000");
 delay(10000);
 while(mySerial.available()!=0)
 Serial.write(mySerial.read());
 Serial.write("\n-----9-----\n");
 mySerial.println("AT+HTTPREAD");
 delay(1000);
 while(mySerial.available()!=0)
 Serial.write(mySerial.read());
 Serial.write("\nend.\n");

Which i get the following output:

Starting..........
AT+CSQ
-----1-----
AT+CGATT=1
ERROR
-----2-----
AT+CGATT?
+CGATT: 1
OK
-----3-----
AT+SAPBR=3,1,"CONTYPE","GPRS"
-----4-----
AT+SAPBR=3,1,"APN","internet"
-----5-----
AT+SAPBR=1,1
-----6-----
AT+HTTPINIT
-----7-----
AT+HTTPPARA="URL","xx.xx.xx.xx/my/web/site"
-----8-----
AT+HTTPDATA=100,1000
-----9-----
AT+HTTPREAD
ERROR
end.

AT+HTTPREAD return error. What wrong with me?

Note

xx.xx.xx.xx/my/web/site is my web page. The error is still there for all web page.

• Tama: I think the problem started from step 3 which i dont see the OK output

Answer 1

The problem (I believe) is that half way through your program you switched from using println() to using print(), thus the commands from that point on aren't being executed until right at the end where you switch back to println(), so the whole of the text you send from point 3 onwards is being run as one single command - which of course is in the wrong format:

AT+SAPBR=3,1,"CONTYPE","GPRS"AT+SAPBR=3,1,"APN","internet"AT+SAPBR=1,1AT+HTTPINITAT+HTTPPARA="URL","xx.xx.xx.xx/my/web/site"AT+HTTPDATA=100,1000AT+HTTPREAD