JavaScript javascript message passing in nodejs javascript message passing,javascript message passing between windows

Can anyone please help me how to do this? I would like to pass the message from the websocket to the serial port every time I receive a message

var firmata = require('firmata');
var board = new firmata.Board('COM4');

var WebSocketServer = require('ws').Server;
var wss = new WebSocketServer({ port: 8081 });

wss.on('connection', function connection(websocket) {
    websocket.on('message', function incoming(message) {
    board.servoWrite(5, message); //This doesn't work but how do i send?
}

board.on("ready", function() {
  board.servoWrite(5, 0); // this works but i need the message from above which I cant access.

});
Answer:1

You should add the listeners after board is ready.

board.on("ready", function() {
    wss.on('connection', function connection(websocket) {
        websocket.on('message', function incoming(message) {
            board.servoWrite(5, message);
        });
    });
});

Either that or declare a variable that tells you if it's ready.

var isReady = false;

board.on("ready", function() {
    isReady = true;
});

wss.on('connection', function connection(websocket) {
    websocket.on('message', function incoming(message) {
        if(isReady)
            board.servoWrite(5, message);
    });
});
Answer:2

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