UNO WiFi R4 & ModbusTCP

Official Hardware UNO Family UNO R4 WiFi
1

Dear community:

I have a UNO R4 WIFI that I just bought and I want to use it as a remote Input/Output station using the ModbusTCP server over my home LAN network. I have an Opta WIFI working as a MODBUS TCP MASTER and I can see the UNO R4 WIFI in the same network as the Opta and I can even send and receive data using Modbus Poll simulation tool, however I get connection timeouts. So in other words It is an intermittent connection to the UNO R4 WIFI and it takes like 5-10 Tx request to get one Rx the it repeat again.

I have tried different libraries but nothing seems to work 100%.

The Sketch below is the closest one working.

Any suggestions on how to solve this issue?
In the following pictures I show the FW version I'm using and the Modbus Poll behavior:

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image1401×318 40 KB

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image1531×336 77 KB

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image1280×831 122 KB

#include <Arduino.h>
//#include <esp_system.h>
//

#ifdef ESP8266
 #include <ESP8266WiFi.h>
#else //ESP32
 #include <WiFi.h>
#endif
#include <ModbusIP_ESP8266.h>

//Modbus Registers Offsets
const int SENSOR_IREG = 0;

//ModbusIP object
ModbusIP mb;

//Registers
const int numRegisters = 10;
uint16_t registers[numRegisters] = {0};

long ts;

void setup() {
    Serial.begin(115200);
    delay(1000);

    Serial.println("Arduino Board Info:");
    //Serial.println(ARDUINO_BOARD);



    WiFi.begin("ATT34X58s7", "244+vci8jrc5");  // "Your_SSID" --> ATT34X58s7  "Your_PASSWORD" --> 244+vci8jrc5
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }

    Serial.println("");
    Serial.println("WiFi connected");  
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());

    mb.server();		//Start Modbus IP
    // Add SENSOR_IREG register - Use addIreg() for analog Inputs
    mb.addIreg(SENSOR_IREG);

    ts = millis();
}

void loop() {
   //Call once inside loop() - all magic here
   mb.task();

// Example: Update the first holding register 
static uint16_t counter = 0; 
registers[0] = counter++; 
//Serial.print(registers[0] ); 
//Serial.print("\n");  //Serial.print("\r\n");


   //Read each two seconds
   if (millis() > ts + 2000) {
       ts = millis();
       //Setting raw value (0-1024)
       //mb.Ireg(SENSOR_IREG, analogRead(A0));
       mb.Ireg(SENSOR_IREG,registers[0] );
   }
   delay(10);

if (counter >= 100){
  counter = 0;
}

}