The SDK GEN4 is a Linux development environment that is used for developing customised Reader software applications for TagMaster RFID readers based on the fourth generation (GEN4) platform. TagMaster readers that utilise the GEN4 platform are the LR-series and HD-series, for example LR-6 and 156640. The SDK is a complete software development environment including a virtual machine that runs Debian GNU/Linux operating systems. The SDK is prepared with compilers, tools, and services for developing Reader application software.