PAW is not Open Source, so (for the time being) you cannot get the source.
Nevertheless … it is now possible for developers to build their own PAW based apps for private and educational purposes. If you plan to use PAW in a commercial product, please drop me a line.
To make this easy, the PAW source code has been restructured.
A sample project along with documentation and a sample APK can be downloaded form the links listed below.
The process of creating a PAW based app should quite easy. Please read the linked documentation for detailed instructions.
… happy coding! :)
Eclipse Project: BuildOwnPawServer.zip
Sample APK: BuildOwnPawServer.apk