scan time per channel

Question

Hi! 
 Background: 
 I'm working on a project where I try to synchronize a wireless sensor network, where the sensors are nrf52 devices. I have gotten to a point where the mean accuracy error lies around 2ms in between the nodes. 
 The scheme is built on a synchronization beacon that sends sync advertisements to all nodes in the network with a certain interval, so the scheme is dependent on that all nodes receives the advertisement at the "exact" same time. A concern for me is the hopping between the advertisement channels (37, 38, 39). 
 The question: 
 How long do you scan on each channel? Before jumping to the next frequency.
 Here someone drops the time 1ms per channel, but I would like someone to confirm it, and maybe point me to some documentation. I guess its decided in the softdevice and nothing you can alter. 
 Thank you!

Anders Strand · Accepted Answer

Hello. 
 You will scan on each channel as long as the scan window is set. See the scanning section of the ble central tutorial. 
 You might be interested in using the timeslot API, where you can control the radio manually. Then you can broadcast advertisements and scan on certain channels. Check out the timeslot tutorial , and the multiactivity examples. 
The multiactivity examples show how to both advertise and scan inside timeslots.