iOS应用程序在后台扫描BLE设备

Question

我的应用程序使用scanForPeripheralsWithServices：扫描BLE设备，该参数指定为servicesUUIDs数组，有时可以快速发现外围设备，但有时需要等待一会儿。而我的应用程序是会话后台。那么，我如何才能尽快发现外围设备背景。

Answer 1

When the app is in the background iOS is enabling Bluetooth from time to time and it is not always listening. This is to save battery and because the WiFi and Bluetooth share the same antenna and cannot send at the same time. To make it discover your peripheral as fast as possible you should if you have access to peripheral implementation, make sure the peripheral advertises itself as often as possible. I believe Apple recommends at least once each 20th ms.