I need help with my Robotdyn arduino Mega r3 + in built wifi

[rohanesh]

Hi, i'm currently trying to send data from my ATMega to the ESP8266. The problem is that :

1. Esp doesn't receive the data if the string is too long unless i increase the delay on my mega's code to be longer.
2. This is a small part of a bigger code where there is a process going on in the background requiring arduino to continously be working with no delay as there is a timer involving millis() in play.

3.I also noticed when coding both that they both share COM3, do i have to reinstall my CH340 Driver?
So I'm looking for help to solve these 3 issues, any help will be appreciated. Sorry if my questions are inaccurate and random as im a beginner and learning as i go. Any help is appreciated

Code for ESP:

#include <ESP8266WiFi.h>
#include <WiFiClient.h> 


String PHValue, h2sValue,volume,kirimState,kirimState2,processReps,coolantType,coolantTypeValue;
float PHValueFloat,h2sValueFloat,volumeValueFloat;
int processRepsInt;




void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

  }



String splitString(String data, char separator, int index)
{
    int found = 0;
    int strIndex[] = { 0, -1 };
    int maxIndex = data.length() - 1;

    for (int i = 0; i <= maxIndex && found <= index; i++) {
        if (data.charAt(i) == separator || i == maxIndex) {
            found++;
            strIndex[0] = strIndex[1] + 1;
            strIndex[1] = (i == maxIndex) ? i+1 : i;
        }
    }
    return found > index ? data.substring(strIndex[0], strIndex[1]) : "";
}

void loop() {
  // put your main code here, to run repeatedly:
  if(Serial.available()){
    String msg = "";
    while(Serial.available()){
      msg += char(Serial.read());
      delay(50);  
    }

    Serial.print("Esp's received msg");
    Serial.println(msg); 
    

    //kirim
    PHValue = splitString(msg, ',', 0);
    h2sValue = splitString(msg, ',', 1);
    processReps = splitString(msg, ',', 2);
    //kirim2
    volume = splitString(msg, ',', 3);
    coolantType= splitString(msg,',',4);
   

    
    
      PHValueFloat=PHValue.toFloat();
      h2sValueFloat=h2sValue.toFloat();
      processRepsInt=processReps.toInt();
  
    

    
      volumeValueFloat=volume.toFloat();
      coolantTypeValue=coolantType;

    Serial.print(msg);
  }
}

Code for Mega:

float PHValue_Test, h2sValue_Test,volume_Test;
int processReps_Test;
String coolantType_Test;
int x=0;
String kirim = "";



void setup(){
  Serial.begin(9600);
  Serial3.begin(115200);
  
}

void loop(){
  
 
  PHValue_Test = 3.4;
  h2sValue_Test = 2.3;
  volume_Test =400;
  processReps_Test=10;
  coolantType_Test="Type S";

                                                             
  kirim = "";
  kirim += PHValue_Test;
  kirim += ",";
  kirim +=h2sValue_Test;
  kirim +=",";
  kirim +=processReps_Test;
  kirim +=",";
  kirim +=volume_Test;
  kirim += ",";
  kirim +=coolantType_Test;
  kirim +=","; 
   
Serial.print("Mega Sent:");
 Serial.println(kirim);
 

  


 Serial3.println(kirim);

 






if(Serial3.available()){
  String msg="";
  while(Serial3.available()){
    msg+=char(Serial3.read());
    delay(50);
    
  }
  
Serial.println(msg);
}

  
  delay(10000);
}