Single peripheral to multiple central connection with S130

[ryan]

I received my nRF51 DK (with nRF51422, PCA 10028) and I could successfully run the S130 demo app thats included with SDK 8.0.0. The above demo demonstrates for e.g. :

Peripheral 1 ---> |----------------------- |
Peripheral 2 ---> |Central/Peripheral | ----> [sniffer]
Peripheral 3 ---> |------------------------|

Now is it possible to modify the example so that the middle nRF51 DK board acting as both central and peripheral connect to multiple central devices in its peripheral role. For e.g.:

Peripheral 1 ---> |----------------------- |-----> [sniffer central]
Peripheral 2 ---> |Central/Peripheral | ----> [iphone central]
Peripheral 3 ---> |------------------------|-----> [android central]

Thank You.

[Hung Bui]

@Ryan: No,by spec it's not possible for a peripheral to connect to several centrals at a time. [EDIT] It's actually wrong. It's possible for a peripheral to connect to several centrals simultaneously. But it will not be on same network, but different networks and the central won't be able to talk to each other.

[ryan]

But I thought BLE 4.1 spec says you can have peripheral devices connected to multiple central devices at the same time and iOS already supports this. Of course my source is Google.

[Hung Bui]

@Ryan: Afaik BLE topology is still star topology, at BLE 4.2 spec. Could you point me to the link of the information you found ?

[sowmya]

Hello Ryan, Can I know how you achieved connecting 2 centrals using S130 stack? As nordic says, only 1 central can connect and even I have a requirement to connect to 2 centrals at a time. Can you please share what modifications you have done to be able connect to multiple centrals?

Regards, Sowmya

[Hung Bui]

@Sowmya: Please be noted that, the star topology won't prevent a device to connect to two centrals at the same time. However, it would be 2 separated networks. And the 2 centrals won't see each other.

[sowmya]

Hi Hung, Yes as per the star topology and nordic stack, it will support only one central at a time. But I also interested to know how Ryan has achieved multiple central connection?