Ehh.
I need a little help.
I have a problem with change relay to light in HA.

And i use in HA optimistic: true. Without it i can't change status of relay.

My knowledge about programming is to low.

Make new dir in config dir. Then add by hand mysensors.json.

I have a sketch with 2 relays, with option save to eprom.
But i have problem in Home Assistant.
I see relay in dashboard but i can't change it state from dashboard.
Home Assistant update state only when i change relay with button

// Enable debug prints to serial monitor
#define MY_DEBUG 


// Enable and select radio type attached
//#define MY_RADIO_NRF24
//#define MY_RADIO_RFM69

// Set LOW transmit power level as default, if you have an amplified NRF-module and
// power your radio separately with a good regulator you can turn up PA level. 
//#define MY_RF24_PA_LEVEL RF24_PA_LOW

// Enable serial gateway
#define MY_GATEWAY_SERIAL

// Define a lower baud rate for Arduino's running on 8 MHz (Arduino Pro Mini 3.3V & SenseBender)
#if F_CPU == 8000000L
#define MY_BAUD_RATE 38400
#endif

// Flash leds on rx/tx/err
// #define MY_LEDS_BLINKING_FEATURE
// Set blinking period
// #define MY_DEFAULT_LED_BLINK_PERIOD 300

// Inverses the behavior of leds
// #define MY_WITH_LEDS_BLINKING_INVERSE

// Enable inclusion mode
#define MY_INCLUSION_MODE_FEATURE
// Enable Inclusion mode button on gateway
#define MY_INCLUSION_BUTTON_FEATURE

// Inverses behavior of inclusion button (if using external pullup)
//#define MY_INCLUSION_BUTTON_EXTERNAL_PULLUP

// Set inclusion mode duration (in seconds)
#define MY_INCLUSION_MODE_DURATION 60 
// Digital pin used for inclusion mode button
#define MY_INCLUSION_MODE_BUTTON_PIN  3 

// Uncomment to override default HW configurations
//#define MY_DEFAULT_ERR_LED_PIN 4  // Error led pin
//#define MY_DEFAULT_RX_LED_PIN  6  // Receive led pin
//#define MY_DEFAULT_TX_LED_PIN  5  // the PCB, on board LED

#include <SPI.h>
#include <MySensors.h>  
#include <Bounce2.h>

// Enable repeater functionality for this node
#define MY_REPEATER_FEATURE


#define RELAY_1  4  // Arduino Digital I/O pin number for first relay (second on pin+1 etc)
#define RELAY_2  5
#define NUMBER_OF_RELAYS 2 // Total number of attached relays
#define RELAY_ON 0  // GPIO value to write to turn on attached relay
#define RELAY_OFF 1 // GPIO value to write to turn off attached relay

#define BUTTON_PIN A1
#define BUTTON2_PIN A2


void before() { 
  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS;sensor++, pin++) {
    // Then set relay pins in output mode
    pinMode(pin, OUTPUT);   
    // Set relay to last known state (using eeprom storage) 
    digitalWrite(pin, loadState(sensor)?RELAY_ON:RELAY_OFF);
  }
}
Bounce debouncer = Bounce();
Bounce debouncer2 = Bounce();

void setup() { 
  // Setup locally attached sensors
  delay(10000);
   // Setup the button.
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  pinMode(BUTTON2_PIN, INPUT_PULLUP);
  // After setting up the button, setup debouncer.
  debouncer.attach(BUTTON_PIN);
  debouncer.interval(5);
  debouncer2.attach(BUTTON2_PIN);
  debouncer2.interval(5);

  //presentation();
}
void presentation()  
{   
  // Send the sketch version information to the gateway and Controller
  sendSketchInfo("Relay", "1.0");

  for (int sensor=1, pin=RELAY_1; sensor<=NUMBER_OF_RELAYS;sensor++, pin++) {
    // Register all sensors to gw (they will be created as child devices)
    present(sensor, S_BINARY);
  }
}

MyMessage msg(1, V_STATUS);
MyMessage msg2(2, V_STATUS);

void loop() { 
  // Send locally attached sensor data here 
  if (debouncer.update()) {
    // Get the update value.
    int value = debouncer.read();
    // Send in the new value.
    if(value == LOW){
         saveState(1, !loadState(1));
         digitalWrite(RELAY_1, loadState(1)?RELAY_ON:RELAY_OFF);
         send(msg.set(loadState(1)));
         }
  }
  if (debouncer2.update()) {
      int value2 = debouncer2.read();
    if(value2 == LOW){
         saveState(2, !loadState(2));
         digitalWrite(RELAY_2, loadState(2)?RELAY_ON:RELAY_OFF);
         send(msg2.set(loadState(2)));
         }
  }
}


void receive(const MyMessage &message) {
  // We only expect one type of message from controller. But we better check anyway.
  if (message.type==V_STATUS) {
     // Change relay state
     digitalWrite(message.sensor-1+RELAY_1, message.getBool()?RELAY_ON:RELAY_OFF);
     // Store state in eeprom
     saveState(message.sensor, message.getBool());
     // Write some debug info
     Serial.print("Incoming change for sensor:");
     Serial.print(message.sensor);
     Serial.print(", New status: ");
     Serial.println(message.getBool());
   } 
}

Hello.
This is my first post.
I use HA since 0.3 version.
All automations i have build on sonoffs.

Now in new flat i want make all wired automation.

Does anyone make a gateway on arduino Mega with relay and buttons connected to arduino?

I search for gateway skatch that work with HA via USB.

Maybe someone can help me?

Regards