When an ESP8266 encounter MQTT and an accelerometer

This is a project I built for a presentation at http://milan2015.codemotionworld.com/ on November 21st.
This idea use ESP8266 (esp04), Nodemcu, MQTT and an accelerometer (adxl345 / sparkfun) by I2C.
It is an IOT project.
This project started as a "drone project" but the original idea changed during time.. by the way, helped me to do:

• some experience with MQTT and I2C
• see how much I can push the Esp8266

It was an interesting challenge!
Check the slides on my previous post to learn more about the project.
In my final demo I had:

• ESP8266 wired with the ADXL345: CS (3.3V), Vcc(3.3V), GND(common GND), SDA (GPIO 2), SDL (GPIO 0).
• a custom nodemcu firmware changed by me  in order to pass this problem with MQTT publish.
• the mosquitto broker running
• the script used during the presentation: available here with instructions
• I have also developed a viewer with NodeJS,MQTT, d3.js, WebSocket for the browser but it's not availble.

Feel free to write me if you want to repeat the project and need helps.