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ZigBee is a very new technology for wireless communication. ZigBee was defined by the ZigBee Alliance (www.zigbee.org), which is comprised of the companies Phillips, Siemens, Samsung, Motorola, and Texas Instruments, among others. ZigBee is described by the industry standard IEEE 802.15.4. The name ZigBee comes from the zigzag dance honey bees use to communicate with other bees in the hive. ZigBee focuses particularly on connecting and controlling home equipment. With ZigBee, you can access and control household appliances, sensors, and actors over short distances. Concrete applications would be, for example, monitoring a smoke detector or automatically controlling a light switch in your home. The ZigBee technology sends in the frequency range of 2.4 GHz, like the two other wireless technologies. One of the primary goals of ZigBee was to work for very low-power devices. Therefore, the sensors battery life can be several months or years. The data rate with ZigBee is relatively small and amounts to 20 to 25 kilobits per second. With this technology, the low-power requirement was placed before the bandwidth. Besides, to remotely control a light switch, you do not need high transmission rates. The range of IEEE 802.15.4 is 20 to 100 meters. A ZigBee network can consist of up to 250 devices (with Bluetooth, the network can consist of only 7). ZigBee operates as WLAN on the 2.4 GHz bandwidth and can interfere with WLAN, which can be a problem in home automation control where WLAN (including Voice over IP telephony) is becoming more and more popular.

Spring MVC has a full-featured processing pipeline, but through the use of sensible abstractions and extensions, it can be easily extended and customized to create powerful applications. The key is the many interfaces and abstract base classes provided for nearly every step along the request s life cycle. As a developer, you are encouraged to implement and extend the provided interfaces and implementations to customize your users experiences. Don t be constrained by the provided implementations. If you don t see something you need, chances are it s very easy to create. For more information on themes and views, including the ViewResolver, continue on to 7. For more information on Controllers (Spring MVC s default request handlers) and interceptors, let s now continue on to 6.

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The instruction stind.i4 (store a 4-byte integer indirectly) allows managed code to operate on the virtual memory of the running process. Whenever a 4-byte integer value needs to be stored at an arbitrary address in virtual memory, this IL instruction is used. The next code sample combines a read and a write operation: void f(int* pi) { *pi += 42; } To map this C++ source code to IL, the C++/CLI compiler generates the following code: // *pi += 42; ldarg.0 dup ldind.i4 // // // // // // // // // // // // // // Push the first argument (pi) on the stack (it will be needed by the stind.i4 instruction at the end of this code sample) Push it again (it will also be needed by the following instruction) Consider the top of the stack to be a virtual address to a 4-byte integer. Replace the top of the stack with the value that the address refers to Push the 4-byte integer value 42 on the stack Consider the top two elements of the stack to be two 4-byte integer values. Replace these two elements with one element whose value is the sum. Store the value on the top of the stack at the address specified by the top - 1 stack element (which is the element pushed in the first instruction of this code sample)

The following device types can be in a ZigBee network: The network coordinator knows and manages the whole network. The coordinator is the most complex device variant, and it has the greatest resource requirements. There is exactly one coordinator per network. A full-function device (FFD) implements the complete function range in accordance with the standard. An FFD device can communicate with other devices and can act as a network router or the coordinator. A reduced-function device (RFD) possesses a reduced function range, only the range necessary to communicate as a network node with the network coordinator. This is the simplest and least expensive type of device. ZigBee is not supported directly by the .NET Micro Framework. However, there are already OEM modules to interface with the serial port or SPI bus. Most of these OEM modules are meant for network terminals and support from there only the RFD standard.

Controller is the workhorse of Spring MVC, providing the glue between the core application and the web. We ve mentioned Controllers several times up to this point, and we will now provide an in-depth review of the different available Controller implementations. This chapter will also cover many of the details surrounding form submission, including details on binding form data to POJOs. Related to data binding are simple validation and how PropertyEditors help convert Strings to complex types. We ll cover both in this chapter.

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