S130 Adv/Scan Scheduling

[Konstantin K]

Can someone from Nordic (or anyone who knows) comment on what happens when scanning and advertising simultaneously with S130. For example:

Scan Interval 100ms Scan Window 98ms Adv Interval 50ms

What does the schedule look like in terms of radio use (scan vs adv)?

Thanks,

Konstantin

[Ulrich Myhre]

Hi, this might be subject to change, but I will give this a go.

This is an unfair arrangement of parameters to begin with, so there is not enough time to actually do both of these operations - and one of them will be blocked. When an operation has been blocked N times in a row, it will get its priority raised. This means that if e.g. the advertiser is running every 50ms, it will always collide with a scanner that wants to scan for 98ms. After N blocked attempts, the scanner will cancel out the planned advertisement and start up. The advertiser will then try to reschedule 50ms into the future instead, and will probably succeed doing so.

For the current S130, I think N is 10. In future versions we hope to make this behavior a bit easier to determine.

[Konstantin K]

Thanks. Any suggestions on how to maximize scanning while also advertising? The goal is to have bi-directional communication using advertising packets.