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Chapter 1. Introduction Bluetooth is a way for devices to wirelessly communicate over short distances. Wireless communication has been around since Marconni and everyone knows about wifi or 802.11 digital wireless communication, but the short distances and protocols are what distinguish bluetooth. A comprehensive set of documents, called the Bluetooth Specifications, describes in gory detail exactly how they accomplish this, but the basic idea is about wireless, short-range communication. By pushing the gory details aside, the fundamentals of bluetooth programming can be understood. Following this understanding comes the basics of iits programming concepts. With a firm grip on the foundations, one can then comfortably explore the rest of bluetooth. In short, our goal is to help the reader get started. 1.1. Understanding Bluetooth as a software developer We show how to connect one Bluetooth device to another and how to transfer data between the two. Connecting devices is more difficult than in the more common internet protocols where the distinction between wired and wireless connections are usually not relevant to the application programmer. Since Bluetooth is about connecting to nearby devices, the programmer must know about finding nearby devices. From that point on, programming is nearly the same as socket programming. So what is the difficulty? Actually, not much except the unusually wide scope of Bluetooth. There is so much in the Bluetooth specification, that one does not know what detail is import for the typical case and what detail can be ignored until later. Technology specifications, especially ones that are given folksy names, often refer to something very specific and with a narrow scope. Ethernet, for example, describes how to connect a bunch of machines together to form a simple network, but that’s about it. TCP/IP describe two specific communication protocols that form the basis of the Internet, but they’re just two protocols. Similarly, HTTP is the