I was searching for my Bluetooth problem a few days but I did not find any useful solution. I would like reading advertising data more precisely manufacturing data from peripheral devices via ios application when it is in the background. In my case, the peripheral devices are Nordic nrf51822 chips and a central device is ios phone. I have successfully implemented the Bluetooth background mode and it works well on the ios device. The Event handler DiscoveredPeripheral is called when the new peripheral device is discovered. But the problem is that it is called only first-time the peripheral device becomes visible. If I turn off and on the peripheral device the DiscoverdPeripheral event is not called anymore. I know that this is ios restriction, but I do not know how can I handle this ios limitation. In the end, I would like that app in the background starts scanning for peripheral devices with specific UUID periodically, for example, every 10minutes. At this point, I would like to ask if this scenario is possible to implement in ios if so I appreciate for any help.
The Event handler DiscoveredPeripheral is called when the new peripheral device is discovered.
This isn't correct. It will only be called once per call to scanForPeripherals. When the device connects, you should stop scanning. When the device disconnects, which you should see as centralManager(_:didDisconnectPeripheral:error:), you can begin scanning again.
Even better, if you only want to reconnect to the same device, don't scan at all. Just call connect for that peripheral UUID. It will continue running while you're in the background and wake you up when the connect succeeds.
To push this further, implement Bluetooth State Restoration, which will allow you to automatically reconnect even after reboots.