Node.JS Client-Server setup and scripts creation with custom functions (events listening, emit, MySQL DB communication, user login verification, etc.)

Task is to create Node.JS server script and test its functionality on client side. Main requirements of functionality: 1. Node.JS server must listen events from clients and return appropriate data using functions. 2. Node.JS server must have different channels. For example some client groups can connect to different channels according appropriated rights (like in chat applications written with Node.JS) 3. Node.JS server must be able to authenticate clients using MySQL DB query and add these users to array object, so that if some user tell server that his skill is changed – these changes must be reflected in users array object right away. After these changes to array object some function will fire up (like write to MySQL DB or emit some data to all users of some group, except adjective user). 4. Node script must be able to restart automatically after server fail or reboot and entire live data must be restored to latest healthy state. 5. On client side user must listen/receive events and emit/send data objects to Node.JS server (using javascript language) 6. Must be possibility to use PHP to listen/receive events and emit/send data objects to Node.JS server (for example if there is need to do something via ajax calls and PHP) To do this task you have to provide server software requirements and install appropriate Node.JS dependences. We could provide fresh linux setup and terminal access. After work is well done we will ask demo simple simulations and package of source scripts including detailed setup TODOs of Node.JS and its dependences installations (It will need to run ready scripts on another live server in the future).