I am using arduino uno with itead 3G shield , my shield works fine but it doesn't responding properly with http command.
After sending "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 :
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
Code :
// 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;
}