Arduino GPRS htttp command doesnt responding properly

[Fazlay Rabbi]

I am using arduino uno with itead 3G shield , my shield works fine but it doesn't responding properly ,
After sendint
"AT+chttpact =......"

it back me +CHTTPACT: REQUEST
then when it send GET command it doesn't response at all

What could be the problem ??

here the real response and the code :

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GSM : Registered to network
GSM : Ready for AT command
 
*** Start HTTP Transaction ***
 
+CHTTPACT: REQUEST
AT+CHTTPACT="jsonplaceholder.typicode.com",80
Sends Request:
GET /posts/1/ HTTP/1.1
Host:jsonplaceholder.typicode.com:80
Content-Length:0
 
 
 
*** End HTTP Transaction ***
 
Memory Free : 1216

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Code :

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// Included header files
#include <SoftwareSerial.h>
 
 
// AT command related
#define AT_CREG_QUERY ("AT+CREG?")
#define AT_CHTTPACT_COMMAND ("AT+CHTTPACT="%s",%d")
#define AT_CHTTPACT_INIT_RESPONSE ("+CHTTPACT: REQUEST")
#define AT_CHTTPACT_DATA_RESPONSE ("+CHTTPACT: DATA,")
#define AT_CHTTPACT_DONE_RESPONSE ("+CHTTPACT:0")
 
#define EOS ('\0')
#define ESC (0x1A)
#define OK ("OK")
 
// GSM definitions
#define unoTXPin (7) // Uno -> GSM
#define unoRXPin (6) // Uno <- GSM
#define powerGSMPin (8)
#define GSMBaudRate (9600)
#define UnoBaudRate (9600)
 
SoftwareSerial gsmSerial(unoRXPin,unoTXPin);
 
#define TEST_REQUEST ("GET /posts/1/ HTTP/1.1\r\nHost:jsonplaceholder.typicode.com:80\r\nContent-Length:0\r\n\r\n")
 
char aux_str [100];
 
int8_t answer;
int aux = 0;
int data_size = 0;
 
 
#define HOST_NAME ("jsonplaceholder.typicode.com")
#define HOST_PORT (80)
 
void setup() {
 
 
// init sequence
Serial.begin(UnoBaudRate);
gsmSerial.begin(UnoBaudRate);
 
gsm_power_on();
while( (sendATcommand(AT_CREG_QUERY, "+CREG: 0,1", 500) || 
sendATcommand(AT_CREG_QUERY, "+CREG: 0,5", 500)) == 0 );
Serial.println(F("GSM : Registered to network"));
Serial.println(F("GSM : Ready for AT command"));
}
void loop () {
 
sprintf(aux_str, AT_CHTTPACT_COMMAND, HOST_NAME, HOST_PORT);
Serial.println(F("\n*** Start HTTP Transaction ***\n"));
Serial.println(AT_CHTTPACT_INIT_RESPONSE);
 
answer = sendATcommand(aux_str, AT_CHTTPACT_INIT_RESPONSE, 60000);
Serial.println(aux_str);
if (answer == 1)
{  
 
data_size = 0;
 
Serial.println(F("Sends Request:"));
Serial.println(TEST_REQUEST);    
gsmSerial.println(TEST_REQUEST);
// Sends 
aux_str[0] = ESC;
aux_str[1] = 0x00;
answer = sendATcommand(aux_str, AT_CHTTPACT_DATA_RESPONSE, 300000);
 
if(answer == 1)
{
Serial.println(AT_CHTTPACT_DATA_RESPONSE);
 
while(gsmSerial.available() > 0) {
Serial.print((char)gsmSerial.read());
}
 
}
 
Serial.println(F("\n*** End HTTP Transaction ***\n"));
Serial.print(F("Memory Free : "));
Serial.println(memoryFree());
while(1); // halt
}
 
 
 
 
}
// variables created by the build process when compiling the sketch
extern int __bss_end;
extern void *__brkval;
// function to return the amount of free RAM
int memoryFree(){
int freeValue;
if((int)__brkval == 0) 
freeValue = ((int)&freeValue) - ((int)&__bss_end);
else 
freeValue = ((int)&freeValue) - ((int)__brkval);
return freeValue;
}
 
void gsm_power_on(){
 
uint8_t answer=0;
 
// checks if the module is started
answer = sendATcommand("AT", "OK", 2000);
if (answer == 0)
{
// power on pulse
digitalWrite(powerGSMPin,HIGH);
delay(200);
digitalWrite(powerGSMPin,LOW);
delay(6000);
// waits for an answer from the module
while(answer == 0){    
// Send AT every two seconds and wait for the answer
answer = sendATcommand("AT", OK, 2000);    
}
}
 
}
 
int8_t sendATcommand(char* ATcommand, char* expected_answer1,
unsigned int timeout)
{
 
uint8_t x=0,  answer=0;
char response[100];
unsigned long previous;
 
memset(response, EOS, 100);    // Initialize the string
 
delay(100);
 
while( gsmSerial.available() > 0) gsmSerial.read();    // Clean the input buffer
 
gsmSerial.println(ATcommand);    // Send the AT command 
 
 
x = 0;
previous = millis();
 
// this loop waits for the answer
do{
 
if(gsmSerial.available() != 0){    
response[x] = gsmSerial.read();
x++;
// check if the desired answer is in the response of the module
if (strstr(response, expected_answer1) != NULL)    
{
answer = 1;
}
}
// Waits for the asnwer with time out
}
while((answer == 0) && ((millis() - previous) < timeout));    
 
return answer;
}
 
int8_t sendATcommand2(char* ATcommand, char* expected_answer1,
char* expected_answer2, unsigned int timeout)
{
 
uint8_t x=0,  answer=0;
char response[100];
unsigned long previous;
 
memset(response, EOS, 100);    // Initialize the string
 
delay(100);
 
while( gsmSerial.available() > 0) gsmSerial.read();    // Clean the input buffer
 
Serial.println(ATcommand);    // Send the AT command 
 
 
x = 0;
previous = millis();
 
// this loop waits for the answer
do{
 
if(gsmSerial.available() != 0){    
response[x] = gsmSerial.read();
x++;
// check if the desired answer is in the response of the module
if (strstr(response, expected_answer1) != NULL)    
{
answer = 1;
}
// check if the desired answer is in the response of the module
if (strstr(response, expected_answer2) != NULL)    
{
answer = 2;
}
}
// Waits for the asnwer with time out
}
while((answer == 0) && ((millis() - previous) < timeout));    
 
return answer;
}

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