Before the discussion start, i need to provide some info on my background.
I have a android app develop under XAMARIN ANDROID platform. The android app will pair with a ZEBRA printer ZQ521. All the print jobs is send from android device to ZQ521 printer via Bluetooth connections. I have use LINK OS XAMARIN SDK's API to handle the Bluetooth communication between android device and ZEBRA ZQ521. Below is the sample source code i tried.