Introduction ============================================ This is a shared repository for common classes required for Telescope Monitoring and Control(TMC) work package of SKA Telescope software. The ska-tmc-common repository contains implementation of Tango abstraction layer. It provides the abstraction in form of following classes: **TangoClient**: Class that provides abstraction for Tango client APIs **TangoGroupClient**: Class that provides abstraction for Tango group APIs **TangoServerHelper**: Class that provides abstraction for Tango device server APIs **TangoHelperDevices**: Class that provides abstraction for various TMC Tango devices for testing and debugging