This App is designed to send commands via Bluetooth in the form of strings (or single character). It can be used as a remote control to turn on and off lights, controlling motors, enable or disable alarms, etc. The date and time sent through appropriate coding can be useful to update the clock of a device with RTC module without the need to enter the hardware dedicated buttons to set the date and time as a result for example of a timezone. A long press on the 9 + 2 (ON and OFF) buttons you can change the send values. The "Save" button records the values so you do not have to change them every time. You must do configure the device before using this App. From the "Conn. BT" button to select the Bluetooth connection with your device that you have to send commands. Own box lists any response messages received from the hardware controlled (Arduino, Raspberry Pi, etc.).