AT+HTTPPARA random URL length

Projects Programming
1

I am trying to do a get request on my server but length of url sent to serial monitor is always random. The URL gets truncated at random locations.

#include <SoftwareSerial.h>

//SIM 880L
#define SIM_RX 3
#define SIM_TX 4
//#define SIM_RT 5

SoftwareSerial gprsSerial(SIM_RX, SIM_TX);

void setup() {
  Serial.begin(9600);

  //Sim800L
  gprsconfig();

}

void loop() {
  //Sim800L
  pushToServer();
}

//SIM800L
void gprsconfig() {
  gprsSerial.begin(9600);
  Serial.println("Config SIM900...");
  delay(2000);

  Serial.println("Done!...");
  gprsSerial.flush();
  Serial.flush();

  gprsSerial.println("AT+CGATT?");
  delay(100);
  toSerial();

  gprsSerial.println("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"");
  delay(2000);
  toSerial();

  gprsSerial.println("AT+SAPBR=3,1,\"APN\",\"airtelgprs.com\"");
  delay(2000);
  toSerial();

  gprsSerial.println("AT+SAPBR=0,1");
  delay(2000);

  gprsSerial.println("AT+SAPBR=1,1");
  delay(2000);
  toSerial();
  delay(2000);
}


void pushToServer() 
{
  gprsSerial.println("AT+HTTPINIT");
  delay(2000);

  gprsSerial.println("AT+HTTPPARA=\"URL\",\"https://google.com\"");
  delay(20000);
  toSerial();
  
  gprsSerial.println("AT+HTTPACTION=0");
  delay(6000);
  toSerial();
  
  gprsSerial.println("AT+HTTPREAD");
  delay(10000);
  toSerial();
  
  gprsSerial.println("");
  gprsSerial.println("AT+HTTPTERM");
  toSerial();
  delay(300);
  
  gprsSerial.println("");
  delay(10000);
}

void toSerial()
{
  while (gprsSerial.available() != 0)
  {
    Serial.write(gprsSerial.read());
  }
}

I am using https://google.com as a demo. This is the output


AT+HTTPTERM

OK

AT+HTTPINIT

OK
AT+HTTPPARA="URL","https:AT+HTTPACTION=0

OK

+HTTPACTION: 0,601,0
AT+HTTPREAD

OK
HELLO

AT+HTTPTERM

OK

AT+HTTPINIT

OK
AT+HTTPPARA="URL","https:AT+HTTPACTION=0

OK

+HTTPACTION: 0,601,0
AT+HTTPREAD

OK

Can I get help what is wrong with this code?

2

you might want to use http://google.com

and how do you power that 'cellular' module that you are using ?

3

I am using sim800l + - ports with a battery + - ports. Connecting gnd of sim800l to Arduino gnd with 10k resistor in between

4

You are sending:
"AT+HTTPPARA=\"URL\",\"https://google.com\""
followed by:
"AT+HTTPACTION=0"

What gets echoed is:
AT+HTTPPARA="URL","https:AT+HTTPACTION=0

It looks like the first command is stopping when it receives the first '/'. I would double-check the instructions for the "+HTTPPARA" command.

5

I don't think it's issue because sometime the url stops in between words as well like

https://gooAT+HTTPACTION=0

I don't know what's causing it.