Test iBeacon's iOS Native Location Manager's Events. When App run in background LocationManager will send event about iBeacon Enter or Leave. The problem of this method is you can monitor only 20 locations and the response time is slow. When I turn on the beacon it show Enter in 20~30 seconds. When I turn off beacon it show Leave also in 20~30 seconds. I think there is no way to change this.
Try to port the RedBear Lab's CC2540 UART Bridge. But unsuccess. Using 1.2.1 Lib, the Serial Port unable to read data from UART. And using 1.3.x Lib, the board just keep boot up again and again. Still no cue about what happen. I think I have to move to study the simple profile and add up my own UART stuff.