Wi-Fi direct is technology that developed from original Wi-Fi technology (it’s developed by
WiFi Alliance). This technology enable two mobile device to communicate to each other with ease
and safty.It’s also known as “bluetooth killer” because it can substitute for bluetooth technology
in every function of bluetooth. Otherwise it support more applications and more effective than
bluetooth technology.So bluetooth technology may come to an end in the next few years.

Although Wi-Fi direct was invented base on the original Wi-Fi technology , it require different working condition that is
” Wi-Fi direct doesn’t require network or signal distribution system because it make the devices able to connect with
each other by peer-to-peer technique and at the same time , it also make the internet connection of PC through smartphone
has better throughput and more secure that the current “ad hoc” method. “Ad hoc” is one mode exist in Wi-Fi technology that allow
the device to transfer data from device to device directly (Peer-to-Peer) but it is difficult to set up and its data transfer rate is around 11 Mbps only.
Wi-Fi direct can search for nearby equipment
without joining the network. It can inform you about services that end-point device can communicate data with.

Prominent point of Wi-Fi direct is its data communication speed up to 250 Mbps. This speed is sufficient for send
high resolution image to the printer or send high definition video from one mobile phone to another one fluently.
The working range of Wi-Fi direct is wider than the range of bluetooth. Its security system is WPA2 encoding
(Wi-Fi Protected Access 2) that can link with multiple devices in the meantime , for example , you can send an image
from your mobile phone to two mobile phones simultaneously.

A more convenient connection will also make the benefit to business organization, especially the businees that
concern with wireless communication. The WPA2 encoding can concisely protect user’s data from hacking.
The security system of Wi-Fi direct (WPA2) is better than bluetooth because it use AES 256-bit encryption method while
bluetooth 4.0 use AES 128-bit encryption.

Wi-Fi direct also backward compatible with ordinary Wi-Fi devices (or the device that support 802.11x networking starndard)
That mean you can connect your Wi-Fi direct supported device to notebook , netbook or printer without upgrading its hardware or software.
Nowadays, there’re many Wi-Fi certified devices such as Intel Centrino Advanced-N 6200 WiFi card , Samsung Galaxy S (World’s first smartphone
that support Wi-Fi direct).

Wi-Fi direct is new technology and I think it’s more effective than both “Ad hoc” and Bluetooth. This technology will be well-known in the near future and you will
see more and more Wi-Fi direct supported devices released to the market.

Thank you,

Jitkasem (admin@embedsoftdev.com)

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Software testing or Testing is an examination conducted to present the stakeholders with data regarding the quality of the service or product under test. This type of software testing as well provides in insight on the independent views and objectives of the software to permit the business to understand all the risks involved during the implementation of the software.
Based on the testing method employed, Software testing can be put into practice at any point of time in the development process. Although, most of the efforts for testing occur after the requirements are defined and the process for coding has been completed.

This article describes two types of testing methodologies.

1. Performance Testing
Performance testing is performed to determine how quick a system or sub-system executes under a particular amount of workload. It can also provide to verify and validate other quality traits of the system, such as reliability, scalability and resource usage.

In the field of Software Engineering, performance testing comes under the testing category which is carried out to how fast a particular aspect of the system under observation performs, given a fixed amount of workload. This sort of testing is a subset of Performance Engineering (up-and-coming computer science practices build to get performance into the architecture and design of a system, prior to the actual effort of coding). There are various purposes which performance testing can serve:
It can compare given two systems and finds out which one is performing better
It can demonstrate whether or not the system meets the required performance criteria.
It can calculate which parts of the system under observation cause the system to perform badly.

2. Regression Testing
This type of testing is any software testing which seeks to find out software errors by partly re-testing a modified program. The intention of this type of testing is to provide a kind of assurance that no additional errors were added during the process of fixing the existing problems. Regression testing is generally used to proficiently examine the system by systematically choosing the appropriate suite of tests which are required to sufficiently cove all of the affected changes.
Widespread methods of regression testing comprise of rerunning earlier run tests and scrutinizing whether previously fixed faults have re-emerged. One of the chief reasons for performing regression testing is that it’s often tremendously difficult for a programmer to outline out how a change in one part of the software will reverberate in other parts of the software.

Ad hoc testing
This term is commonly used to represent software testing without any documentation or planning. The tests are made to run only once, unless a defect is discovered. This type of testing is more of a part of exploratory testing. Here, the tester seeks to find errors by any means that seems appropriate to him/her.

Unit Testing
This type of testing is a software verification and validation method where a programmer tests if individual units of system are fit for utilization. A unit is the least testable part of an application. In procedural programming, a unit might be an individual procedure or function.

Advantages

The advantage of performing Performance and Regression testing are:
Reusable: Can reuse tests on diverse versions of an application, even if the user interface alters
Repeatable: Can check how the software responds under repeated execution of the identical operations.
Programmable: Can program complicated tests that bring out concealed information from the application.
Cost Reduction: Cost is reduced since the amounts of resources for regression test are reduced.
Reliable: Tests carry out precisely the equivalent operations each time they are run, thereby eradicating human error.
Comprehensive: Can build a suite of tests that wraps every feature in the application.
Better Quality Software: Can run additional tests in fewer time with less resources
Fast: Automated Tools run tests considerably faster as compared to the human users.

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1. Software testing part I.
2. Software testing part II (White Box and Black Box testing)
3. User Acceptance Testing.