Log_Data_into_Google_Sheets_using_IFTTT_and_NodeMCU.ino

#include <ESP8266WiFi.h>

long  i;
String  Mystring;
WiFiClient client;

String MakerIFTTT_Key ;
;String MakerIFTTT_Event;
char *append_str(char *here, String s) {  int i=0; while (*here++ = s[i]){i++;};return here-1;}
char *append_ul(char *here, unsigned long u) { char buf[20]; return append_str(here, ultoa(u, buf, 10));}
char post_rqst[256];char *p;char *content_length_here;char *json_start;int compi;

void setup()
{
  i = 0;
Mystring = "";

Serial.begin(9600);
  WiFi.disconnect();
  delay(3000);
  Serial.println("START");
   WiFi.begin("xxxxxxxxxx","xxxxxxxxxx");
  while ((!(WiFi.status() == WL_CONNECTED))){
    delay(300);
    Serial.print(".");

  }
  Serial.println("Connected");
  Serial.println("Your IP is");
  Serial.println((WiFi.localIP().toString()));

}


void loop()
{

    i = (random(0,100));
    Mystring = i;
    if (client.connect("maker.ifttt.com",80)) {
      MakerIFTTT_Key ="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
      MakerIFTTT_Event ="sheets";
      p = post_rqst;
      p = append_str(p, "POST /trigger/");
      p = append_str(p, MakerIFTTT_Event);
      p = append_str(p, "/with/key/");
      p = append_str(p, MakerIFTTT_Key);
      p = append_str(p, " HTTP/1.1\r\n");
      p = append_str(p, "Host: maker.ifttt.com\r\n");
      p = append_str(p, "Content-Type: application/json\r\n");
      p = append_str(p, "Content-Length: ");
      content_length_here = p;
      p = append_str(p, "NN\r\n");
      p = append_str(p, "\r\n");
      json_start = p;
      p = append_str(p, "{\"value1\":\"");
      p = append_str(p, Mystring);
      p = append_str(p, "\",\"value2\":\"");
      p = append_str(p, "");
      p = append_str(p, "\",\"value3\":\"");
      p = append_str(p, "");
      p = append_str(p, "\"}");

      compi= strlen(json_start);
      content_length_here[0] = '0' + (compi/10);
      content_length_here[1] = '0' + (compi%10);
      client.print(post_rqst);


      Serial.println("Value sent to Google Sheets");
      Serial.println(i);

    }
    delay(20000);

}