Bluetooth Controller is a free Android app developed by NJ App Lab that allows users to send commands via Bluetooth. The app has two versions, 1.0 and 2.0, each with different features. The first version, released without an update since its launch, includes a GUI mode that enables users to create custom position command buttons and a command mode that allows users to send command text. This version also supports STX, ETX, CR, and LF. The second version, released in 2017, includes an auto mode that sends commands repeatedly a specified number of times, and delay that allows users to specify the time to send the command.

Bluetooth Controller is a convenient tool for users who need to send commands via Bluetooth. The app is easy to use, and it works well with LG G3 Cat 6 and HC-06 Bluetooth module. The GUI mode in version 1.0 allows users to create custom buttons for easy access to frequently used commands. The auto mode in version 2.0 is a handy feature for users who need to send commands repeatedly. Overall, Bluetooth Controller is a useful app for anyone who needs to send commands via Bluetooth.