More complicated clients, one which monitor updates from the steward looking for changing conditions, and reacting to them on behalf of the user by asking the steward to perform actions, are entirely possible. Technically speaking these are intelligent agents working in a multi-agent system with shared goals of making life more convenient for the user. We like to think that we're implementing magic.
PopCARD: Pop Machine Cash Card Gallery
The project is about to create a system for settlement by the Popcard in commercial vending machines. The author is a vending machine in the hallway of their building and was selling drinks to your neighbors. Think of how selling drinks without cash, started this project.
DIY IoT: Build a ‘Net-Connected System Today Gallery