Code to control a LED-strip based on chips ws2811. It switches on a line of LEDs white (parameter 2>parameter1) or switches all the LEDs off (parameter 1 = 0; parameter 2 = 0)

LedChainManager.java

public class LedChainManager extends Manager{
    private LinuxRaspberryPiGpioManager linuxRaspberryPiGpioManager;
    private int parameter1, parameter2;
    private static LedStrip ledStrip;
    private final int leds = 10;


    public LedChainManager(LinuxRaspberryPiGpioManager linuxRaspberryPiGpioManager) {
        this.linuxRaspberryPiGpioManager = linuxRaspberryPiGpioManager;
        init();        
    }

    private void init() {
        ledStrip = new LedStrip(linuxRaspberryPiGpioManager.getPi4j(), leds, 1);
    }

    public void execute() {
        Logger.logGpio("LED colors changing started");
        ledStrip.allOff();
        delay(5);
        ledStrip.allOff();  //Sometimes not every LED can be switched off after the first trying
        if (parameter1 <= parameter2 ){
            if (parameter1 == 0 && parameter2 == 0){
                Logger.logGpio("All LEDs were switched off");
            }
            else {
                long startTime = System.currentTimeMillis();
                if (parameter1 >= 0 && parameter2 <= 9) {
                    for (int i = 0 ; i < leds; i++){
                        if (i >= parameter1 && i <= parameter2) {
                            ledStrip.setPixelColor(i, PixelColor.WHITE);
                        }
                    }
                    ledStrip.render();
                }
                if (GlobalVariables.debug) Logger.logGpio("LED strip colors were changed in " + (System.currentTimeMillis()-startTime) + " milliseconds. LEDs from: " + parameter1 + " to " + parameter2 + " flash");
            }
        }
    }

    public void dispose(){
        ledStrip.close();
    }
  
    public void setParameter1(int startLed) {
        this.parameter1 = startLed;
    }

    public void setParameter2(int lastLed) {
        this.parameter2 = lastLed;
    }
}

Sometimes one LED can start to shine red. First LED never shines