扫描时如何获取断开的BLE列表？

Question

Please check following code:

NSDictionary *scanOptions = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO] forKey:CBCentralManagerScanOptionAllowDuplicatesKey];
[centralManager scanForPeripheralsWithServices:nil options:scanOptions];

I'm able to scan all the BLEs and connect successfully. I have a button in my app to scan again for BLEs. When I try to scan again using above code, it scans all the BLEs and disconnect all the BLEs which are already connected.

So is there any way to scan only for those Peripherals which are not connected.

Thanks in advance!

Answer 1

NO,there isn't a way to scan only for the connected Peripherals.

As - scanForPeripheralsWithServices:options: method is the only way to scan for Peripherals,You can scan only for the Peripherals with special services by specify the services parameter. Or you can specify CBCentralManagerScanOptionAllowDuplicatesKey and CBCentralManagerScanOptionSolicitedServiceUUIDsKey in options parameter,both have nothing to do with connect state.

But you can discover all peripherals and pick out the disconnected peripherals by check the peripheral's state in callback: - (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary<NSString *,id> *)advertisementData RSSI:(NSNumber *)RSSI