iOS BLE scanForPeripheralsWithServices：options：在背景上

Question

CentralManager doesn't scan BLE device on Background....

I already set UIBackgroundModes , bluetooth-central in info.plist.

also tried input UUID for service like this..

[CentralManager scanForPeripheralsWithServices:@[[CBUUID UUIDWithString:@"0xFFA0"]] options:nil];

(0xFFA0 is UUID for Service.)

also tried "C337FA9-4DCF-****-77AB-************"; UUID for device. whatever I put the UUID in Services. not found any device on Background.

when foreground.. scanForPeripheralsWithServices:nil found all devices. but not scanForPeripheralsWithServices:someuuids

can anyone help me?

Answer 1

1.if you use

scanForPeripheralsWithServices:someuuids

There must be some device advertise bluetooth packets with this uuids.This can work well in both foreground and backgournd

2 if you use

scanForPeripheralsWithServices:nil

You can get all device you want ,but this does not work when in background.

So,if you want to get result in background,you have to set your Peripherals advertise BLE packets with UUID.