How can I execute script once until if becomes false? (Node.JS)

Question

I am very new to coding, and don't know how to to quite word this questions. I am incorporating the CS:GO Game State Integration feature added recently to change Hue Lights based on what is happening in the game. The current part I am working on is a simple script that will change the first light to blue if I am on the 'CT' team. It's working fine besides the fact that it keeps telling me I'm on CT side over and over again. Is there a way I could change my script to only update if the first If statement becomes false?

Code:

setInterval(checkTeam, 250);

function checkTeam() {
  fs.readFile('player_team', 'utf8', function(err, teamStatus) {
    if (err) throw err;

    if(teamStatus === 'CT') {
      console.log('CT Side');
      if (currentStatus !== 'CT') {
        changeLight(1, noLights());
        currentStatus = 'CT';
      }
      if (currentStatus === 'CT') {
        changeLight(1, blueLights());
        currentStatus = 'CT';
      }
    }
    if (teamStatus === 'T'){
      console.log('T Side');
      if (currentStatus !== 'T Side') {
        changeLight(3, noLights());
      }
      if (currentStatus === 'T Side') {
        changeLight(3, orangeLights());
        currentStatus = 'T';
      }
      if (currentStatus === null) {
        changeLight(1, noLights());
      }
    }
  });
}

function changeLight(light, lightType) {
  var jsonString = JSON.stringify(lightType);
  http.request({
    host: HUE_BRIDGE_IP,
    path: HUE_PATH + 'lights/' + light + '/state',
    method: 'PUT',
    headers: {
      'Content-Type': 'application/json',
      'Content-Length': jsonString.length
    }
  }, function() {

  }).write(jsonString);
}

function redLights() {
  return {
    'on': true,
    'sat': 254,
    'bri': 254,
    'hue': 0,
    'transitiontime': 0
  }
}

function blueLights() {
  return {
    'on': true,
    'sat': 254,
    'bri': 254,
    'hue': 45000,
    'transitiontime': 0
  }
}

function explodeLights() {
  return {
    'on': true,
    'sat': 254,
    'bri': 254,
    'hue': 10000,
    'transitiontime': 0
  }
}

function whiteLights() {
  return {
    'on': true,
    'sat': 0,
    'bri': 254,
    'hue': 10000
  }
}

function noLights() {
  return {
    'on': false,
    'transitiontime': 0
  }
}

function orangeLights() {
  return {
    'on': false,
    'transitiontime': 0
  }
}

I'm guessing the only part you really need is the top, but just in case you needed the changeLight function, I included more. Basically, I want to get the if(teamStatus === 'CT') { to only execute once until that either changes or becomes null. If that's not possible, is there a compromise?

Thanks ahead to anyone who attempts to help,
Appreciate it!

Edit:
So I don't think I gave enough info so here is the code for the server getting the info from the game state:

var bodyParser = require('body-parser');
var express = require('express');
var fs = require('fs');
var app = express();

app.use(bodyParser.json()); // for parsing application/json

app.post('/', function(req, res) {
  fs.readFile('player_team', 'utf8', function(err, teamStatus) {
    var player = 'player' in req.body ? req.body.player : null;
    if (player && player.team !== teamStatus) {
      var newTeamStatus = req.body.player.team;
      if (!newTeamStatus) {
        newTeamStatus = '';
      }
      fs.writeFile('player_team', newTeamStatus);
      console.log(newTeamStatus);
    }
  });
});

var PORT = 8080;
var HOST = '127.0.0.1';
app.listen(PORT, HOST);
console.log('Server is running on ' + HOST + ':' + PORT);

Answer 1

from what I can guess of the logic, you might want to do:

var currentStatus = '';
function checkTeam() {
    fs.readFile('player_team', 'utf8', function (err, teamStatus) {
        if (err) throw err;
        if (teamStatus !== currentStatus) { // only change lights if status has changed
            if (teamStatus === 'CT') {
                console.log('CT Side');
                changeLight(3, noLights()); // turn off 3?
                changeLight(1, blueLights());
            }
            else if (teamStatus === 'T') {
                console.log('T Side');
                changeLight(1, noLights()); // turn off 1?
                changeLight(3, orangeLights());
            }
            else {
                changeLight(1, noLights());
                changeLight(3, noLights()); // 1 and 3?
            }
            currentStatus = teamStatus; // update the current status
        }
    });
}

The only thing I can't figure out is what the 1 or 3 in changeLight does, so this code may be incomplete, however I believe it does what your original code does without flickering the lights or console.log what team you are on every 250ms

I've added some comments to lines I think may be needed if there are two different lights one of which goes blue or the other goes orange