GPS/GPRS/GSM V3.0 arduino - how to get data from web- DFRobot Forum

2016-07-21 15:50:29 [quote="leandro08rezende"]Hi leff.
In my case, I really need to use this Shield, because my arduino won't have Wifi signal available.
The webservice that I am using, it´s a Jersey webservice, which one always will answer in a Json format. So
if you do a request to this webservice to send data and expects an answer, you need to be able to manipulate Json data.

But my friend, the code in this url that you posted really worked, after few changes of course, because wouldn' t be that easy
HAHAHAHA

The only problem is that always the last character of the answer is shown as a weird character, but it's not a big deal because in my case it will be always quotation marks.

hey, Is this a code that worked for you? harjotnagra

2016-03-30 22:34:00 Oh, sorry I can not help mcuh on this, and neither I can speak Spanish... Leff

2016-03-28 19:18:49 yes :l but i dont find any answer x.x or can be that i don't understand jeje is so difficult when you speak spanish x.x and all is in english, and you speak a little about it...

I need to send the coordinates to a website :l KelSepúlveda

2016-03-18 02:22:22 Hi,

Have you read the several links on the end of its wiki, FAQ > Q4 Leff

2016-03-17 23:13:05 podrían decirme como envían los datos a la página web? KelSepúlveda

2016-03-16 22:54:10 [quote="leandro08rezende"]Hello everyone.
First of all, I am working on a project using Arduino Uno and Shield GPS/GPRS/GSM Module V3.0, wich one I need to be able to send data to a web page and after get the anwser back in my arduino.
Until now, I can send the data to my web page, but I don't know how to get the anwser of the web page.

[b]Could you tell me how you do that?[/b] KelSepúlveda

2015-11-09 19:25:06 Wow, suprising!

I know quite little about Json, but so glad to know it's working!

Leff

2015-11-09 19:25:06 Wow, suprising!

I know quite little about Json, but so glad to know it's working!

Leff

2015-11-06 10:05:51 Hi leff.
In my case, I really need to use this Shield, because my arduino won't have Wifi signal available.
The webservice that I am using, it´s a Jersey webservice, which one always will answer in a Json format. So
if you do a request to this webservice to send data and expects an answer, you need to be able to manipulate Json data.

But my friend, the code in this url that you posted really worked, after few changes of course, because wouldn' t be that easy
HAHAHAHA

The only problem is that always the last character of the answer is shown as a weird character, but it's not a big deal because in my case it will be always quotation marks.

Anyway, thanks again

Code: Select all

int data_size;
char data[512];
char aux;
int x = 0;
int8_t answer;
char aux_str[100];

void setup()
 {
   //Init the driver pins for GSM function
    pinMode(3,OUTPUT);
    pinMode(4,OUTPUT);
    pinMode(5,OUTPUT);
   //Output GSM Timing 
    digitalWrite(5,HIGH);
    delay(1500);
    digitalWrite(5,LOW); 
    Serial.begin(9600);
        // Use these commands instead of the hardware switch 'UART select' in order to enable each mode
    // If you want to use both GMS and GPS. enable the required one in your code and disable the other one for each access.
    digitalWrite(3,LOW);//enable GSM TX、RX
    digitalWrite(4,HIGH);//disable GPS TX、RX
    
    delay(20000);
    
    start_GSM();
 }
 
 void loop(){ 
   send_GPRS();
   delay(30000);
 }
 
 void start_GSM(){
    Serial.println("AT");
    delay(2000);
    Serial.println("AT+CREG?");
    delay(2000);
// I am using a brazilian mobile operator
    Serial.println("AT+SAPBR=3,1,\"APN\",\"zap.vivo.com.br\"");
    delay(2000);
    Serial.println("AT+SAPBR=3,1,\"USER\",\"vivo\"");
    delay(2000);
    Serial.println("AT+SAPBR=3,1,\"PWD\",\"vivo\"");
    delay(2000);
    Serial.println("AT+SAPBR=3,1,\"Contype\",\"GPRS\"");
    delay(2000);
    Serial.println("AT+SAPBR=1,1");
    delay(10000);
    Serial.println("AT+HTTPINIT");
    delay(2000);
    Serial.println("AT+HTTPPARA=\"CID\",1");
    delay(2000);
 }
 
 void send_GPRS(){
    digitalWrite(3,LOW);//Enable GSM mode
    digitalWrite(4,HIGH);//Disable GPS mode
    Serial.print("AT+HTTPPARA=\"URL\",\"your_url/");
    Serial.print("parameter 1");
    Serial.print("/");
    Serial.print("parameter 2");
    Serial.println("\"");
    delay(2000);
    Serial.println("AT+HTTPACTION=0"); //now GET action  
    delay(10000);
    
    x=0;
    do{
        sprintf(aux_str, "AT+HTTPREAD=%d,100", x);
        if (sendATcommand2(aux_str, "+HTTPREAD:", "ERROR", 3000) == 1)
        {
            data_size = 0;
            while(Serial.available()==0);
            aux = Serial.read();
            do{
                data_size *= 10;
                data_size += (aux-0x30);
                while(Serial.available()==0);
                aux = Serial.read();        
            }while(aux != 0x0D);

            if (data_size > 0)
            {
                while(Serial.available() < data_size);
                Serial.read();

                for (int y = 0; y < data_size; y++)
                {
                    data[x] = Serial.read();
                    x++;
                }
                data[x] = '\0';
            }
            else
            {
                Serial.println("Download finished");    
            }
        }
        else if (answer == 2)
        {
            Serial.println("Error from HTTP");
        }
        else
        {
            Serial.println("No more data available");
            data_size = 0;
        }
        
        sendATcommand("", "+HTTPACTION:0,200", 2000);
    }while (data_size > 0);
    
    Serial.print("Data received: ");
    Serial.println(data);

    //sendATcommand("AT+HTTPTERM", "OK", 5000);
    //delay(5000);
}
  
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, '\0', 100);    // Initialize the string

    delay(100);

    while( Serial.available() > 0) Serial.read();    // Clean the input buffer

    Serial.println(ATcommand);    // Send the AT command 


        x = 0;
    previous = millis();

    // this loop waits for the answer
    do{
        if(Serial.available() != 0){    
            response[x] = Serial.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, '\0', 100);    // Initialize the string

    delay(100);

    while( Serial.available() > 0) Serial.read();    // Clean the input buffer

    Serial.println(ATcommand);    // Send the AT command 


        x = 0;
    previous = millis();

    // this loop waits for the answer
    do{        
        if(Serial.available() != 0){    
            response[x] = Serial.read();
            x++;
            // check if the desired answer 1 is in the response of the module
            if (strstr(response, expected_answer1) != NULL)    
            {
                answer = 1;
            }
            // check if the desired answer 2 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;
}

leandro08rezende

2015-11-06 10:05:51 Hi leff.
In my case, I really need to use this Shield, because my arduino won't have Wifi signal available.
The webservice that I am using, it´s a Jersey webservice, which one always will answer in a Json format. So
if you do a request to this webservice to send data and expects an answer, you need to be able to manipulate Json data.

But my friend, the code in this url that you posted really worked, after few changes of course, because wouldn' t be that easy
HAHAHAHA

The only problem is that always the last character of the answer is shown as a weird character, but it's not a big deal because in my case it will be always quotation marks.

Anyway, thanks again

Code: Select all

int data_size;
char data[512];
char aux;
int x = 0;
int8_t answer;
char aux_str[100];

void setup()
 {
   //Init the driver pins for GSM function
    pinMode(3,OUTPUT);
    pinMode(4,OUTPUT);
    pinMode(5,OUTPUT);
   //Output GSM Timing 
    digitalWrite(5,HIGH);
    delay(1500);
    digitalWrite(5,LOW); 
    Serial.begin(9600);
        // Use these commands instead of the hardware switch 'UART select' in order to enable each mode
    // If you want to use both GMS and GPS. enable the required one in your code and disable the other one for each access.
    digitalWrite(3,LOW);//enable GSM TX、RX
    digitalWrite(4,HIGH);//disable GPS TX、RX
    
    delay(20000);
    
    start_GSM();
 }
 
 void loop(){ 
   send_GPRS();
   delay(30000);
 }
 
 void start_GSM(){
    Serial.println("AT");
    delay(2000);
    Serial.println("AT+CREG?");
    delay(2000);
// I am using a brazilian mobile operator
    Serial.println("AT+SAPBR=3,1,\"APN\",\"zap.vivo.com.br\"");
    delay(2000);
    Serial.println("AT+SAPBR=3,1,\"USER\",\"vivo\"");
    delay(2000);
    Serial.println("AT+SAPBR=3,1,\"PWD\",\"vivo\"");
    delay(2000);
    Serial.println("AT+SAPBR=3,1,\"Contype\",\"GPRS\"");
    delay(2000);
    Serial.println("AT+SAPBR=1,1");
    delay(10000);
    Serial.println("AT+HTTPINIT");
    delay(2000);
    Serial.println("AT+HTTPPARA=\"CID\",1");
    delay(2000);
 }
 
 void send_GPRS(){
    digitalWrite(3,LOW);//Enable GSM mode
    digitalWrite(4,HIGH);//Disable GPS mode
    Serial.print("AT+HTTPPARA=\"URL\",\"your_url/");
    Serial.print("parameter 1");
    Serial.print("/");
    Serial.print("parameter 2");
    Serial.println("\"");
    delay(2000);
    Serial.println("AT+HTTPACTION=0"); //now GET action  
    delay(10000);
    
    x=0;
    do{
        sprintf(aux_str, "AT+HTTPREAD=%d,100", x);
        if (sendATcommand2(aux_str, "+HTTPREAD:", "ERROR", 3000) == 1)
        {
            data_size = 0;
            while(Serial.available()==0);
            aux = Serial.read();
            do{
                data_size *= 10;
                data_size += (aux-0x30);
                while(Serial.available()==0);
                aux = Serial.read();        
            }while(aux != 0x0D);

            if (data_size > 0)
            {
                while(Serial.available() < data_size);
                Serial.read();

                for (int y = 0; y < data_size; y++)
                {
                    data[x] = Serial.read();
                    x++;
                }
                data[x] = '\0';
            }
            else
            {
                Serial.println("Download finished");    
            }
        }
        else if (answer == 2)
        {
            Serial.println("Error from HTTP");
        }
        else
        {
            Serial.println("No more data available");
            data_size = 0;
        }
        
        sendATcommand("", "+HTTPACTION:0,200", 2000);
    }while (data_size > 0);
    
    Serial.print("Data received: ");
    Serial.println(data);

    //sendATcommand("AT+HTTPTERM", "OK", 5000);
    //delay(5000);
}
  
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, '\0', 100);    // Initialize the string

    delay(100);

    while( Serial.available() > 0) Serial.read();    // Clean the input buffer

    Serial.println(ATcommand);    // Send the AT command 


        x = 0;
    previous = millis();

    // this loop waits for the answer
    do{
        if(Serial.available() != 0){    
            response[x] = Serial.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, '\0', 100);    // Initialize the string

    delay(100);

    while( Serial.available() > 0) Serial.read();    // Clean the input buffer

    Serial.println(ATcommand);    // Send the AT command 


        x = 0;
    previous = millis();

    // this loop waits for the answer
    do{        
        if(Serial.available() != 0){    
            response[x] = Serial.read();
            x++;
            // check if the desired answer 1 is in the response of the module
            if (strstr(response, expected_answer1) != NULL)    
            {
                answer = 1;
            }
            // check if the desired answer 2 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;
}

leandro08rezende

2015-11-05 19:38:25 hi,

I always use a wifi module to make it.

which webserver do you use when you send data to it? And is there any function to send message or talk to the GSM module?

I found this shield which uses sim908 too. And they offered a HTTP service sample sketch. I don't know if it could help:
https://www.cooking-hacks.com/documenta ... ry-pi#http Leff

2015-11-05 08:36:33 Hello everyone.
First of all, I am working on a project using Arduino Uno and Shield GPS/GPRS/GSM Module V3.0, wich one I need to be able to send data to a web page and after get the anwser back in my arduino.
Until now, I can send the data to my web page, but I don't know how to get the anwser of the web page.

Searching about this over the internet, I found that maybe I need to use some AT Commands as for example "AT+ATHTTPREAD", but the problem is that I didn't get good results.

So, if someone know how to get the data from a URL and show it at arduino, please help me !
Thanks a lot! leandro08rezende