There are 2 IOS devices: device C and device S. They both host a service with a characteristic and both advertise themselves. Device C have found device S and connects to it. After characteristic is found, connection C -> S is established. But after it, device S wants to connect back and write ti characteristic on device C, instead of writing to local characteristic and notifying device C. That way both devices are central and peripheral at the same time. Is there a way to do this?