Hi everybody,
first I have to say I'm quite new to all of this.
Anyhow, I have an Arduino Uno R3 with an IComSat 1.1 SIM900 attached.
I'm using this library (version 3.05), as it supports using the gsm shield as a web client:
https://code.google.com/p/gsm-shield-arduino/downloads/list
After adding this library to Arduino 1.0.5 I open the library's example GSM_GPRSLibrary_Client.ino with the following code:
#include "SIM900.h"
#include <SoftwareSerial.h>
#include "inetGSM.h"
//To change pins for Software Serial, use the two lines in GSM.cpp.
//GSM Shield for Arduino
//www.open-electronics.org
//this code is based on the example of Arduino Labs.
//Simple sketch to start a connection as client.
InetGSM inet;
char msg[50];
int numdata;
char inSerial[50];
int i=0;
boolean started=false;
void setup()
{
//Serial connection.
Serial.begin(9600);
Serial.println("GSM Shield testing.");
//Start configuration of shield with baudrate.
//For http uses is raccomanded to use 4800 or slower.
if (gsm.begin(9600)){
Serial.println("\nstatus=READY");
started=true;
gsm.forceON();
}
else Serial.println("\nstatus=IDLE");
if(started){
//GPRS attach, put in order APN, username and password.
//If no needed auth let them blank.
if (inet.attachGPRS("internet.t-mobile", "t-mobile", "tm"))
Serial.println("status=ATTACHED");
else Serial.println("status=ERROR");
delay(1000);
//Read IP address.
gsm.SimpleWriteln("AT+CIFSR");
delay(5000);
//Read until serial buffer is empty.
gsm.WhileSimpleRead();
//TCP Client GET, send a GET request to the server and
//save the reply.
numdata=inet.httpGET("www.google.com", 80, "/", msg, 50);
//Print the results.
Serial.println("\nNumber of data received:");
Serial.println(numdata);
Serial.println("\nData received:");
Serial.println(msg);
}
};
void loop()
{
//Read for new byte on serial hardware,
//and write them on NewSoftSerial.
serialhwread();
//Read for new byte on NewSoftSerial.
serialswread();
};
void serialhwread(){
i=0;
if (Serial.available() > 0){
while (Serial.available() > 0) {
inSerial[i]=(Serial.read());
delay(10);
i++;
}
inSerial[i]='\0';
if(!strcmp(inSerial,"/END")){
Serial.println("_");
inSerial[0]=0x1a;
inSerial[1]='\0';
gsm.SimpleWriteln(inSerial);
}
//Send a saved AT command using serial port.
if(!strcmp(inSerial,"TEST")){
Serial.println("SIGNAL QUALITY");
gsm.SimpleWriteln("AT+CSQ");
}
//Read last message saved.
if(!strcmp(inSerial,"MSG")){
Serial.println(msg);
}
else{
Serial.println(inSerial);
gsm.SimpleWriteln(inSerial);
}
inSerial[0]='\0';
}
}
void serialswread(){
gsm.SimpleRead();
}
The Terminal result (set to 9600 baud) is:
GSM Shield testing.
status=READY
DB:STARTING NEW CONNECTION
DB:SHUTTED OK
DB:APN OK
DB:CONNECTION OK
DB:ASSIGNED AN IP
status=ATTACHED10.23.36.179
DB:RECVD CMD
DB:OK TCP
DB:NOT CONN
DB:NOT CONN
DB:NOT CONNNumber of data received:
0Data received:
After the line "DB:OK TCP", the GSM shield just switches off, the status LED turns from green to off.
My problem is similar to this post:
http://forum.arduino.cc/index.php?PHPSESSID=apsi2m7mpb4s0d9lfgm4fiiva2&topic=134353.0
Using the SMS sample works fine, I'm able with the same set up to send SMS...
I have a 9V battery attached as well as the USB-cable.
Any help is appreciated.