The Bluetooth V4.2 module from Stollmann E+V is based on the nRF52 chip from Nordic Semiconductor and can be used for a wide range of applications in the IoT sector. A GATT server with up to three connections is available as the central unit. In parallel, a peripheral terminal I/O connection can be used to connect to a smartphone/tablet. The module is extremely small (17 mm ×10 mm × 2.6 mm) and equipped with an AT-Command interface. Corresponding apps and demo source code are available for Android and iOS.