“This instructables show how to use ESP8266 module as a HTTP + Web Socket server to build a low lag time (fast response) WiFi remote robot.
There are tons of WiFi remote robot on the web. Most of them have a simple web interface that can control the robot by a few arrow buttons. It is good enough for demonstrating the circuit works. However the response time is too slow even compare it with a few bucks RC car :(
Every remote control command can be only 1 or 2 bytes, but a single HTTP request introduce hundreds bytes overhead and require wait establish a new connection each time. WebSocket can eliminate this overhead and get over 10 times of performance gain.