Роли BLE Bluetooth следующие: реклама, сканер, ведомый, главный и инициатор.

With the development of Bluetooth modules and various wireless transmission protocols in the past two years, the efficiency of Bluetooth wireless data transmission has been significantly improved.

最近在深水埗腦場看到一款只賣$19的Bluetooth 5.0 dongle，這簡直令人眼前一亮！要知道支援Bluetooth 5.0的dongle在世上絕無僅有，而$19這個價錢甚至比同場另一款只支援Bluetooth 4.0的dongle便宜一半。