Problem to read the http get response with GSM A7670

Naznee · Apr 4, 2024

this is my code

C:

#include <HardwareSerial.h>
#if defined(CONFIG_IDF_TARGET_ESP32)
    #define mySerial Serial2
#elif defined(CONFIG_IDF_TARGET_ESP32S2)
    #define mySerial Serial1
#elif defined(CONFIG_IDF_TARGET_ESP32S3)
   #define mySerial Serial2
#endif
String msg="";

void setup()
{
  Serial.begin(115200);
  delay(500);
 
  #if defined(CONFIG_IDF_TARGET_ESP32)
    mySerial.begin(115200);
 #elif defined(CONFIG_IDF_TARGET_ESP32S2)
    mySerial.begin(115200);
 #elif defined(CONFIG_IDF_TARGET_ESP32S3)
   mySerial.begin(115200, SERIAL_8N1, 18, 17);
 #endif
 mySerial.println("AT+CICCID");delay(500);
  update_serial();
  mySerial.println("AT+CREG?");delay(500);
  update_serial();
  mySerial.println("AT+CGATT=1");delay(500);
  update_serial();
  mySerial.println("AT+CGACT?");delay(500);
  update_serial();
  mySerial.println("AT+CGDCONT=1,\"IP\",\"jionet\"");delay(500);
  update_serial();

 mySerial.println("AT+HTTPINIT\r\n");delay(500);
  update_serial();
 mySerial.println("AT+HTTPPARA=\"URL\",\"http://api.timezonedb.com/v2.1/get-time-zone?key=KXXXXXXXXX&format=json&by=zone&zone=Asia/Kolkata\"");
delay(500);
  update_serial();
   mySerial.println("AT+HTTPACTION=0\r\n");delay(2000);
  update_serial();
  mySerial.println("AT+HTTPREAD?");delay(2000);
  update_serial();
  mySerial.println("AT+HTTPTERM\r\n");delay(2000);
  update_serial();

}
void loop()
{
 update_serial();
}

 void update_serial()
{
    if (mySerial.available()) {
     
       msg = mySerial.readStringUntil('\n');
      Serial.println(msg);
       
    }
}

and this is an output

OK
AT+CGATT=1
OK
AT+CGACT?
+CGACT: 1,1
+CGACT: 8,1
OK
AT+CGDCONT=1,"IP","jionet"
OK
AT+HTTPINIT
OK
AT+HTTPPARA="URL","http://api.timezonedb.com/v2.1/get-time-zone?key=KXXXXXXXXX&format=json&by=zone&zone=Asia/Kolkata"
OK
AT+HTTPACTION=0
OK
+HTTPACTION: 0,200,385
AT+HTTPREAD?
+HTTPREAD: LEN,385
OK
AT+HTTPTERM
OK

when I add the line to add the response or data

C:

#include <HardwareSerial.h>
#if defined(CONFIG_IDF_TARGET_ESP32)
    #define mySerial Serial2
#elif defined(CONFIG_IDF_TARGET_ESP32S2)
    #define mySerial Serial1
#elif defined(CONFIG_IDF_TARGET_ESP32S3)
   #define mySerial Serial2
#endif
String msg="";

void setup()
{
  Serial.begin(115200);
  delay(500);
 
  #if defined(CONFIG_IDF_TARGET_ESP32)
    mySerial.begin(115200);
 #elif defined(CONFIG_IDF_TARGET_ESP32S2)
    mySerial.begin(115200);
 #elif defined(CONFIG_IDF_TARGET_ESP32S3)
   mySerial.begin(115200, SERIAL_8N1, 18, 17);
 #endif
 mySerial.println("AT+CICCID");delay(500);
  update_serial();
  mySerial.println("AT+CREG?");delay(500);
  update_serial();
  mySerial.println("AT+CGATT=1");delay(500);
  update_serial();
  mySerial.println("AT+CGACT?");delay(500);
  update_serial();
  mySerial.println("AT+CGDCONT=1,\"IP\",\"jionet\"");delay(500);
  update_serial();

 mySerial.println("AT+HTTPINIT\r\n");delay(500);
  update_serial();
 mySerial.println("AT+HTTPPARA=\"URL\",\"http://api.timezonedb.com/v2.1/get-time-zone?key=KXXXXXXXXXX&format=json&by=zone&zone=Asia/Kolkata\"");
delay(500);
  update_serial();
   mySerial.println("AT+HTTPACTION=0\r\n");delay(2000);
  update_serial();
 
  mySerial.println("AT+HTTPREAD=0,385");delay(2000);
  update_serial();
  mySerial.println("AT+HTTPTERM\r\n");delay(2000);
  update_serial();
}
void loop()
{
 update_serial();
}

 void update_serial()
{
    if (mySerial.available()) {
     
       msg = mySerial.readStringUntil('\n');
      Serial.println(msg);
       
    }
}

this is the ouput

AT+CICCID
+ICCID: 89918680400450857327
OK
AT+CREG?
+CREG: 0,6
OK
AT+CGATT=1
OK
AT+CGACT?
+CGACT: 1,1
+CGACT: 8,1
OK
AT+CGDCONT=1,"IP","jionet"
OK
AT+HTTPINIT
OK
AT+HTTPPARA="URL","http://api.timezonedb.com/v2.1/get-time-zone?key=KXXXXXXXXXXX&format=json&by=zone&zone=Asia/Kolkata"

please help me to read the payload from the server

KlausST · Apr 4, 2024

Hi,

in "update_serial"

Code:

void update_serial()
{
    if (mySerial.available()) {
     
       msg = mySerial.readStringUntil('\n');
      Serial.println(msg);
       
    }

You only read until "\n".
What if there is additional text?

My ideas:
* Why (all at once) not read the whole content of the UART buffer?
* or (line-by-line) why not use a "WHILE" loop to read all available lines (multiple " \n")?

Klaus

Naznee · Apr 4, 2024

KlausST said:
Hi,

in "update_serial"

Code:

void update_serial() { if (mySerial.available()) { msg = mySerial.readStringUntil('\n'); Serial.println(msg); }

You only read until "\n".
What if there is additional text?

My ideas:
* Why (all at once) not read the whole content of the UART buffer?
* or (line-by-line) why not use a "WHILE" loop to read all available lines (multiple " \n")?

Klaus

this is the ouput after whole data read upto my serial is available

AT+CICCID
+ICCID: 89918680400450857327
OK
AT+CREG?
+CREG: 0,6
OK
AT+CGATT=1
OK
AT+CGACT?
+CGACT: 1,1
+CGACT: 8,1
OK
AT+CGDCONT=1,"IP","jionet"
OK
AT+HTTPINIT
OK
AT+HTTPPARA="URL","http://api.timezonedb.com/v2.1/get-time-zone?key=KXXXXXXXXXX&format=json&by=zone&zone=Asia/Kolkata"
OK
AT+HTTPACTION=0

KlausST · Apr 4, 2024

Hi,

Did you modify your code?
I can´t see.

Klaus

Naznee · Apr 5, 2024

KlausST said:
Hi,

Did you modify your code?
I can´t see.

Klaus

I modified the code.

C:

void update_serial()
{
    while (mySerial.available()) {
      
       msg = mySerial.read();
      Serial.print(msg);
        
    }

Naznee · Apr 5, 2024

now I get the response
thank you for responses
.
.
.
.
can you please tell me how to get the time from NTP server with GSM module
i read the AT commands from manual and try to do it but can't set the time.
Test Command
AT+CNTP=? response +CNTP:255,(-96~96)
OK
Read Command
AT+CNTP? Response +CNTP:,
OK
Write Command
AT+CNTP=””[,] Response OK or ERROR
Execution Command
AT+CNTP Response +CNTP:,
OK or ERROR

i tried with many server but can't get the time

Naznee · Apr 12, 2024

Naznee said:
now I get the response
thank you for responses
.
.
.
.
can you please tell me how to get the time from NTP server with GSM module
i read the AT commands from manual and try to do it but can't set the time.
Test Command
AT+CNTP=? response +CNTP:255,(-96~96)
OK
Read Command
AT+CNTP? Response +CNTP:,
OK
Write Command
AT+CNTP=””[,] Response OK or ERROR
Execution Command
AT+CNTP Response +CNTP:,
OK or ERROR

i tried with many server but can't get the time

now i get the time from ntp there is a buffer overflow issue

KlausST · Apr 12, 2024

Naznee said:
there is a buffer overflow issue

impossible for us to see ... with the snippet of post#6

Additionally: On buffer overflow you usually get incomplete messages. You gave no information how your modem response looked like.

****

If you want fast and good feedback .. next time better post complete code and complete error description.
It saves yourself from a week long delay.

Klaus

Problem to read the http get response with GSM A7670

Naznee

Newbie level 6

KlausST

Advanced Member level 7

Naznee

Newbie level 6

KlausST

Advanced Member level 7

Naznee

Newbie level 6

Naznee

Newbie level 6

Naznee

Newbie level 6

KlausST

Advanced Member level 7

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