CONNECTIVITY DOS AND DON TS in VS .NET

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CONNECTIVITY DOS AND DON TS
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Robustness and Defensive Design
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Robustness and defensive programming have been promoted in software engineering for some time, but they are even more relevant to embedded devices than other types of hardware, and they are more relevant to communications-based applications than to other types of software. Almost in contradiction, consumers expect higher levels of robustness from smartphones than from other computing devices that they are exposed to. Jokes about Microsoft Windows crashing may be unfair in view of the size and complexity of the software that users run and expect to coexist, but they are part of the PC culture; there is no such tolerance of crashes in smartphones users expect them to just work. This means that any shortcomings in robustness will be highlighted.
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15.2.1 Consider Running Out of Memory
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Running low on memory is a standard issue for an embedded device. PC Connectivity applications are no more prone to it than any other type of Symbian OS software; nonetheless the issue is mentioned here because it bears repeating. Implement all Symbian OS software based on the approaches that have been developed and tested over a number of versions of Symbian OS.
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15.2.2 Consider Loss of Power or Connection
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Any computing device may be subject to loss of power, but a smartphone is more vulnerable than many others. The battery may run low because the user has forgotten to charge the device, or the user may remove the battery while tinkering with the phone. More common (thankfully) than a complete loss of power is loss of a connection. If you are implementing an Over The Air (OTA) service then the smartphone may lose its signal at any time. PC Connectivity applications are less subject to loss of connection for this reason, but wireless connections can still be vulnerable and it is surprising how often users break the connection, whether accidentally or deliberately. Loss of power gives very little time to save any data or recover, and loss of connection can be little better. Depending on the implementation, you may nd your service simply unloaded, or you may get a chance to call a cleanup routine. Therefore, you need to consider what happens if your service is terminated at any point. This is most relevant where you are writing data to the device, either writing directly to a le or writing to a database by means of some API. Where you are using a system API, you may be able to rely on it to manage transactions and recover from failure. If you are writing directly to the ling system then consider the consequences of a
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DEVICE AND SERVICE MANAGEMENT
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partially written le, particularly if you have to write it across multiple PDUs because of the size of the le. In some cases it can be sensible to write to a temporary le and rename it for use when it is complete, but this has been known to back re if the le is very large in some cases the drive is not large enough for the original le and the new copy. Although I have emphasized the need to protect the state of the smartphone, you should also consider the effect, on any data on the PC, of the connection to the device being lost. The rst level is to include exception handling to catch a loss of connection wherever you communicate with the smartphone. The second level is to consider how to protect data from being partially written, for which similar approaches can be used to those on the smartphone.
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15.2.3 Allow for a Missing Service
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Fortunately, this issue is simpler to handle than some of the others. If you are using a specialized PC Connectivity service that you have developed, then you need to handle the possibility that the user may attempt to work with a smartphone that lacks the service, either because they have just installed the PC software and have not realized that it needs extra software installed on the phone, or because they are trying to use a phone other than their customary one. In either case, you can provide a simple and clear indication of the problem and the user will know how to correct it. If you do not respond helpfully, the user may simply dismiss your application as broken and never again try to use it.
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