Driving WS2811, WS2812 and other NeoPixel devices from ESP8266

Has anyone gotten the NeoPixels function working recently. When I try and run it, the first neopixelWrite() works but ones after that seem to be ignored. This is the sample I am using:

var esp8266 = require("ESP8266");
pinMode(D2, "output");
function colorLeds(red, green, blue) {
  var data = [];
  for (var i=0; i<2; i++) {
    data.push(green);
    data.push(red);
    data.push(blue);
  }
  esp8266.neopixelWrite(NodeMCU.D2, data);
}

setInterval(function() {
  console.log("Changing ...");
  colorLeds(Math.floor(Math.random() * 256), Math.floor(Math.random() * 256), Math.floor(Math.random() * 256));
}, 1000);