Embedded Software for the IoT

9Wireless networks

9.1Introduction

This chapter is mostly dealing with Wi-Fi, and secondly with Bluetooth. Before diving into these, we will look at the overall picture. You can structure the huge selection of wireless networks in many ways. In approximate descending order of link-distance:

–Global No system has a global wireless link that allows you to talk from anywhere to anywhere without some kind of relay station. Satellite phones are a good example. Here, we have an uplink from the transmitting satellite phone to the satellite, and a downlink to the receiver, typically connected to the normal telephone network (today part of the internet). Similarly, a mobile phone connects wirelessly to a base station, which via the internet is connected ...