When running this application, your iphone will work as an Bluetooth Peripheral device, you can alter It's UUID in the source code as you like.
press the boardcast button and start the ble signal boardcast, any device that work as a central device is able to find your iphone as well as discover its service and characteristics.
also, it can send or receive data.
2019/03/29 - Central Manager functions added, now the app is cappable of working as both peripheral and central, to use central functions, swipe from the left edge to right , bring up the side menu and switch to central manager.