<button id="buttonOn1" onClick="on1()">On 1</button>

<button id="buttonOff1" onClick="off1()">Off 1</button>

<br>

<button id="buttonOn2" onClick="on2()">On 2</button>

<button id="buttonOff2" onClick="off2()">Off 2</button>

function on1() { // when button "on" is pressed we

    ws.send("1"); // send number 1 via websocket

}

function off1() { // when button "off" is pressed we

    ws.send("0"); // send number 0 via websocket

}

function on2() { // when button "on" is pressed we

    ws.send("3"); // send number 3 via websocket

}

function off2() { // when button "off" is pressed we

    ws.send("2"); // send number 2 via websocket

}

switch (value) {

    case "1":

        board.digitalWrite(13, board.HIGH); // write high on pin 13

    break;

    case "0":

        board.digitalWrite(13, board.LOW); // write low on pin 13

    break;

    case "3":

        board.digitalWrite(8, board.HIGH); // write high on pin 8

    break;

    case "2":

        board.digitalWrite(8, board.LOW); // write low on pin 8

    break;            

}