Deafness times for S130 and S132

RE: Deafness times for S130 and S132

Elm — Fri, 27 Oct 2017 13:55:45 GMT

Thanks, that was the answer I was looking for.

regards, Elm

RE: Deafness times for S130 and S132

Hung Bui — Fri, 27 Oct 2017 11:32:47 GMT

Hi Elm,

Your observation was correct. The scheduler on the softdevice, with limitation on the complexity, doesn't have much flexibility when it come to arranging timeslot.

The long switching time (around 800us) was the limitation of the softdevice, not of the chip (40us)

As far as I know, even though the scheduler was re-written from S132 v4.0, the way it works is unchanged. We reduced some housekeeping time but that's it.

Keep in mind that the softdevices were not designed for mesh.

As Tom already suggest, you can either use our mesh solution or implement your own solution either using timeslot, or not using softdevice at all.

Another suggestion is to use Zephyr, you have access all the way to the controller and can use HCI to command.

RE: Deafness times for S130 and S132

Elm — Thu, 26 Oct 2017 13:05:37 GMT

Tom,

Thanks for your expedited reply!

Your answer is essentially the same as my "solution 1." Yes, we have looked at the Mesh SDK, and we believe that this is the best way forward.

However, I specifically wondered if there were changes to the scheduler in later/newer versions of the SDK which could help us, as in my (hoped-for) "solution 2". Also, not all implementations of BLE controllers in the world can benefit from using a Timeslot API-type of interface.

From you avoiding discussion the matter, can I assume that there are no such improvements?

regards, Elm

RE: Deafness times for S130 and S132

thst — Thu, 26 Oct 2017 12:49:27 GMT

Elm,

I see that you have made quite a bit of progress. Have you looked at the Mesh SDK?

It solves this deafness issue by using timeslot API
It is built on top of the S130/S132
It is open source, so you can use what you want as long as it is on an nRF device
http://www.nordicsemi.com/eng/Products/Bluetooth-low-energy/nRF5-SDK-for-Mesh

-Tom