BLE Scatternet Algorithm

RE: BLE Scatternet Algorithm

hberg — Wed, 14 Jun 2017 12:08:41 GMT

Sadly, yes. But thank you anyway!

RE: BLE Scatternet Algorithm

Sigurd — Wed, 14 Jun 2017 11:16:12 GMT

Ok, then you are unfortunately limited to 1 connection as a Peripheral and up to 8 connections as a Central.

RE: BLE Scatternet Algorithm

hberg — Wed, 14 Jun 2017 11:13:05 GMT

The hardware is already equiped with an nrf51822 and sold to customers. It is an existing design and must be extended with new features.

RE: BLE Scatternet Algorithm

Sigurd — Wed, 14 Jun 2017 11:04:55 GMT

Out curiosity, why can't you change to nRF52?

RE: BLE Scatternet Algorithm

hberg — Wed, 14 Jun 2017 10:48:24 GMT

There is no possiblity to change to nRF52, therefore i have to use the S130 softdevice. But interesting to know that the S132 is that much more capable.

RE: BLE Scatternet Algorithm

Sigurd — Wed, 14 Jun 2017 10:46:42 GMT

Yes, but this constraint is only for the S130 SoftDevice(nRF51), but if you switch to a nRF52 device you can use the S132 Softdevice, where you can have e.g. 20 connections from central to peripheral if you want. You can connect a nRF52 device to e.g. 10 centrals and 10 peripherals if you want, the only limitation is that the number of connections(centrals+peripherals) is max 20.

RE: BLE Scatternet Algorithm

hberg — Wed, 14 Jun 2017 09:35:15 GMT

In several algorithms they connect a slave (peripheral) to more than one master (central), serving as a bridge. In S130, only one connection from central to peripheral is possible. It is possible to serve as bridge by connecting to one central, and letting a another central connect to the bridge (serving as peripheral). But this changes the behaviour of the algorithm. Do you know what i mean?

RE: BLE Scatternet Algorithm

Sigurd — Wed, 14 Jun 2017 09:05:37 GMT

What kind of BLE constraints are you talking about? That prevents these algorithms to be applied for BLE?

RE: BLE Scatternet Algorithm

hberg — Wed, 14 Jun 2017 09:03:07 GMT

It is more about the formation of the scatternet than the routing. There are many formation algorithms for bluetooth that are simulated and tested, but i can't really find anything for BLE.

RE: BLE Scatternet Algorithm

Sigurd — Wed, 14 Jun 2017 08:56:41 GMT

I don't have links to any algorithms, so you will have to implement how any routing of messages through the scatternet should work yourself.

RE: BLE Scatternet Algorithm

Sigurd — Wed, 14 Jun 2017 08:43:12 GMT

Hi,

Building a BLE scatternet is fully possible. The SoftDevice S132 v4.0.2 support 20 connections, where you can freely configure each link/connection in any combination between Peripheral and Central.