how many phone can bluetooth device linked concurrently

[qoboty]

Bluetooth device,use S110,can linked one phone,like example ble_app_uart, How many phone linked concurrently? Thank you!

[Stefan Birnir Sverrisson]

The S110 is a peripheral softdevice, which means the phone needs to be an central in order to communicate with it. A peripheral device can only maintain one connection at a time. If you let however nRF51 act as a central by using S120 softdevice, then you can maintain up to 8 links to 8 different peripherals concurrently, e.g. to 8 phones that act as peripherals. The S110 can however maintain a single connection and concurrently broadcast in non-connectable mode. Further ideas are on this thread

[Stefan Birnir Sverrisson]

S110 is sufficient for the peripheral role. If you however intend to switch roles at some point, choose S130, as it is both peripheral and central. S130 requires more recources, both ROM and RAM, so if you dont need both central and peripheral, choose S110.