Driving WS2811, WS2812 and other NeoPixel devices from ESP8266

I'm trying again today. I've got what I think is the latest firmware (espruino_1v85.tve_master_66fde09_esp8266) flashed onto my brand new Wio Link (esp-12-ish). The repl works great over serial (much nicer than nodemcu's raw repl).

The wio link deluxe kit comes with a neopixel strip. It works great using their provided software (HTTP based interface), now I'm trying the same hardware using espruino.

No matter what I do, the pixels don't light up.

esp = require('ESP8266');
pinMode(D14, 'output');
esp.neopixelWrite(D14,[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]);