Connection Stability, Packet loss, etc...

RE: Connection Stability, Packet loss, etc...

Kenneth — Tue, 26 Jan 2016 13:43:50 GMT

Sorry, I though your question was about Scatternets. The scheduler is described in detail in the SDS, there is no known issues with having multiple links and scanning at the same time. But connection intervals might be skipped if the scan parameters are set for instance higher than the connection interval. I think my initial answer describe how you should set the scan parameters to have least influence on the active connections while scanning.

RE: Connection Stability, Packet loss, etc...

Marius Heil — Tue, 26 Jan 2016 12:53:09 GMT

Yes, I know about that one, but that would mean you have done no proper measurements on nodes that have multiple connections (as Central and Peripheral) with the S130?

RE: Connection Stability, Packet loss, etc...

Kenneth — Tue, 26 Jan 2016 12:17:04 GMT

Sorry no, we haven't really done any proper investigation or measurement on this. We have solved this slightly differently using a rebroadcasting mesh: github.com/.../nRF51-ble-bcast-mesh

RE: Connection Stability, Packet loss, etc...

Marius Heil — Tue, 26 Jan 2016 07:59:35 GMT

Yes, I do have multiple connections. You do have tested Scatternets internally I would guess, any chance to get access to some of these measurements and results?

RE: Connection Stability, Packet loss, etc...

Kenneth — Mon, 25 Jan 2016 14:15:45 GMT

As long as scan interval is shorter than the connection interval, then scanning will have no impact on communication. Exception might be if you have multiple connections at the same time.

RE: Connection Stability, Packet loss, etc...

Marius Heil — Fri, 22 Jan 2016 15:43:54 GMT

Mhh, that's too bad that there is no API to get access to these measures. It could certainly help a lot. I wouldn't have guessed that connections could really time out while advertising or scanning. I thought that connections had a very high priority. I guess that takes my to trial and error for configuring the settings.

RE: Connection Stability, Packet loss, etc...

Kenneth — Fri, 22 Jan 2016 10:08:05 GMT

There is no API to get information about connection quality no. The multilink scheduling priority for S130 should be described in the softdevice specification, e.g.: infocenter.nordicsemi.com/.../multilink_scheduling.html

Typically I recommend to set the scan window to minimum, and adjust scan interval to fit the current consumption requirements of the application. The reason I recommend a short scan window, is that it will have minimum effect on other softdevice functionality you might want to use in the application. For instance connections will be blocked during a scan window, and a long scan window can delay execution of flash commands and timeslot api.