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of devices and detecting newly available devices. You now know how to probe for devices, resolve devices, and exchange metadata. You also learned how controlling and eventing work and how you can implement them with the .NET Micro Framework. Now, you are ready to use this promising technology to build complex communication scenarios. The next chapter describes and compares various wireless communication technologies. You will learn about using Ethernet networking wirelessly and learn more about other wireless communication approaches.
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f a microcontroller needs to communicate wirelessly with other devices such as PCs, PDAs, other microcontrollers, or sensors, wireless LAN, Bluetooth, Z-Wave, and, more recently, ZigBee are the four main technologies you can use to facilitate that communication. The most suitable of these technologies to use depends on your application, as all technologies were conceived for a certain purpose and are optimized for that. In the previous chapter, you learned how to program networking applications. You can use this know-how to also work with wireless LAN communications. This chapter will show you how you can add wireless functionality to your .NET Micro Framework hardware with original equipment manufacturer (OEM) modules. At the end of the chapter, I will compare these technologies to help you decide which technology best fits your application.
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Wireless local area network (WLAN) is the wireless version of the Ethernet LAN technology; this technology is called also Wi-Fi (Wireless Fidelity). WLAN is defined by the industry standard of the IEEE 802.11 family, and the IEEE 802.11b subtype is most often used. IEEE 802.11b transmits on the 2.4 GHz frequency and has a bandwidth of up to 11 megabits per second. Commercial equipment has a range of up to 100 meters in an open outdoor area and can be increased to 300 meters by external antennas. WLAN is a common standard and is supported currently on many PDAs, notebooks, and PCs. Due to the high transmission speed, WLAN is the best choice for PC networks, wireless Internet, and video streaming, for example. To be able to use WLAN with a .NET Micro Framework device, WLAN must be integrated on the device. You can find more information about available devices and their capabilities in 2. The programming of WLAN is accomplished in the same way as networking via Ethernet LAN by using network sockets. Therefore, please refer to 6, which covered networking, for more information.
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CHAPTER 7 WIRE LESS COMMU NIC ATION
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Note The Digi Connect devices were, for a long time, the only network-enabled devices. The Digi Connect
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devices used a built-in TCP/IP stack implemented by Digi for the network support. Network programming was accomplished, then, with classes and methods from the .NET Micro Framework base class library, which, under the hood, take services from the Digi stack. However, Microsoft implemented its own TCP/IP stack for the .NET Micro Framework that is available since, and built into, the .NET Micro Framework 2.5 firmware. Since that s available, a larger spectrum of platforms with (wireless) network support will follow.
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Bluetooth technology came from a 1994 study by the Ericsson company, which sought to find a replacement for cable connections. Due to the results of the study, the companies Ericsson, Nokia, IBM, Toshiba, and Intel adopted the specification as industry standard IEEE 802.15.2. The name comes from the Danish Viking King Harald Blatand (in English, Bluetooth ), who united nearly all of Scandinavia in the 10th century. The Bluetooth name honors the high level of Scandinavian participation in the development. In addition, it embodies the hope that one day all mobile devices will be united and able to communicate with one another. The Bluetooth technology was developed as an inexpensive cable replacement for connecting mobile and stationary equipment. A large number of mobile phones, PDAs, and some notebooks already integrate Bluetooth. Additionally, this technology can be retooled simply and inexpensively by USB-Bluetooth modules for the PC or notebook. IEEE 802.15.2 sends, like WLAN, on the 2.4 GHz frequency. The effective net transmission rate for Bluetooth version 1.0, 1.0B, 1.1, and 1.2 amounts to 730 kilobits per second, and for Bluetooth version 2.1 with enhanced data rate (EDR) transmission, it amounts to up to 2.1 megabits per second. Version 2.1 with EDR is backward compatible with the first versions. The Bluetooth standard specifies how devices detect each other and establish connections among themselves, and how the data communication is performed and secured. For Bluetooth devices, there are three power classes, resulting in three different sending ranges and power consumption rates, as shown in Table 7-1.
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