A free app for Android, by Codenia.

Blue Switch is a tool for the wireless remote control of a relay module.

The app supports Bluetooth low energy (BLE) modules. You can use it to turn on or off your home or commercial heating, lighting, and air conditioning systems. It can also be used to control appliances such as burglar alarms, security cameras, doorbells, and access doors. It can also be used to control your home’s temperature and humidity.

To use this tool, you need to download it to your smartphone or tablet and install it.