Bluetooth P2

Introducing Bluetooth Applicationsnotwithstanding, the added value from simply being wireless convinced consumers to try it and use it! However, for products that are inherently static, the added value may just be initial “desire” and not really a viable investment in both resources and dollars. Consider the static devices in our wired PAN (Figure 1.1)—for example, the ubiquitous mouse and keyboard. Both are dependant for their power supply requirements upon their host PC, so if made wireless, the subject of batteries becomes crucial....
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Bluetooth P212 Chapter 1 • Introducing Bluetooth Applications notwithstanding, the added value from simply being wireless convinced con- sumers to try it and use it! However, for products that are inherently static, the added value may just be initial “desire” and not really a viable investment in both resources and dollars. Consider the static devices in our wired PAN (Figure 1.1)—for example, the ubiquitous mouse and keyboard. Both are dependant for their power supply requirements upon their host PC, so if made wireless, the subject of batteries becomes crucial.This added value of wireless connectivity can only be enjoyed if the user does not have to change or re-charge the batteries every week! Our static devices—desktop PCs with the obligatory mains power cable—would be perhaps better served by a wired Ethernet link rather than a Bluetooth LAN point (both cables embedded under the floor in your office as standard). Electric lights are another facet to consider—just think of the reduced installation costs in an office building of no wiring loom. Here, however, we do require power. So is wireless really adding value? It could be valuable if added as a control extra.The user could then connect via a handheld device or static panel to whichever light they wished to control. At the other end of the scale, the end user value of a Bluetooth PCMCIA card is easily visible, and will provide complete wireless connectivity. Ensure that your product will really give the user added value by being wire- less, not just offer a gimmick. If the consumer has to connect a power cable, then consider what other functionality can be offered.The desktop PC, although best served by a wired Ethernet connection, will still need to connect to our laptop and PDA, and thus requires both wired and wireless connectivity. An intriguing application would be a wireless pen—consider its use for signa- ture authentication provided by the credit company, bank, or reception desk, a super method to try and eliminate fraud. If a wireless implementation could be designed for the stringent size constraint, how would we stop users from walking off with it? Why are the ordinary pens always attached to the counters? Would being wireless really add value to this application? Investigating Convenience Added user value is a “big plus” for the consumer but wireless communications may not necessarily make the product more convenient to use.We assume that consumers are all comfortable with gadgets and electronic devices, but can your friends all program their VCRs yet? www.syngress.com Introducing Bluetooth Applications • Chapter 1 13 Let’s examine the traditional headset and mobile phone and decide ifBluetooth technology makes this more convenient for the user.With currenthands-free technology, you have to decide in advance if you require the hands-free option.This involves fitting your car with a hands-free kit—a microphone orheadset plugged in, with the wire trailing from it to your phone which is eitherin your pocket, clipped to your jacket/belt, in a cradle on your dashboard, or likemost of us, fallen down between the seat and the handbrake! When you receive a call, you answer by pressing a button on the cable;volume control is available via a button on the cable.The limitation is that youalways have to have your telephone with you; it can only be as far away as thecable is long.Thus, it is always a conscious decision to use the headset, and todecide to plug it in! With a Bluetooth headset and phone, the phone can beinside your briefcase, in the boot of the car, in your jacket on the hook in theoffice, in fact, absolutely anywhere—as long as it’s within the range of theheadset. In much the same way as the conventional technology, you press abutton on the headset to receive a call or to adjust the volume.The connectionbetween the two devices is extremely different, however, and although virtuallyinvisible to the user, it will incur a connection time overhead. First, the headsetmust “pair” with the Audio Gateway (AG), the Bluetooth part of the phone.Thisallows Bluetooth addresses to be swapped, and link keys to be established.Theheadset will then be able to make a connection to the AG or the AG will be ableto connect to the headset—the exact operation is a software application issue. Ifthe headset connects to the phone, then the phone needs to know why, either toset up voice dialing, action voice dialing, or some other function. If the phoneconnects to the headset, it patches a SCO link across and the headset can be usedto take the incoming call. The connection time could be a problem if you must connect every time acall comes in. After ten seconds of trying to make a connection, the caller hasprobably decided you are not going to answer and given up! A low power parkmode allows headset and phone to stay constantly connected without drainingtheir batteries; this overcomes the slow connection problem. So you mustbeware—if connection time is an issue for your product, make absolutely sureyour system supports park mode—although it’s becoming increasingly common,it’s still possible to buy devices that do not support it. My conclusion would be that Bluetooth technology would make answeringmy phone far more convenient, although extremely expensive at the moment! Ido not have to worry where my phone is, per-equip my car, or have to endure a www.syngress.com14 Chapter 1 • Introducing Bluetooth Applications cable running from my ear. If the complex connection ...