Connection speed

[yuval]

Hi,

My project is based on NRF52832 with SDK11.

I got 2 working units, 1 is advertiser and 1 central.

The advertiser is advertising every 2 second.

The central unit is trying to connect to the advertiser every few hours for few seconds to pass some data.

I found out that when the 2 units are near (up to 1m distance) the central finds the advertiser much quicker (about some few  seconds) than when the units are 3-4m or more distance away.

In that case it can take the central about 8-15 seconds to find the unit (in scanning).

I set the advertiser to +4 power.

Is there something in my software which can help the central unit finds the advertiser (in scanning) more quickly?

Also, Can you recommend about other possible solutions?

B.r

Yuval.

[Edvin]

Can you please try to capture a sniffer trace using the nRF Sniffer for Bluetooth LE? And keep the sniffer device close to the central that is trying to connect. Do one trace when it is very close (1m) and one when it is 3-4m or more, so that it takes 8-15 seconds. Can you save those traces as .pcapng and upload them here please?

Best regards,

Edvin

[yuval]

LOCK_Few_meters_away.pcapngLOCK_10cm.pcapng

Hi,

Thanks for your answer.

I shutdown the central unit and operate only the sniffer.

The advertiser is advertising every 2s some bursts - (It's a mechanism we built that every 2s it awakes the unit and advertises for some few 10 ms)

As you can see when the advertiser is close to the sniffer then the sniffer sees much more bursts......

I think this is the problem when the central is active, sometimes it connect fast and some times it take much more seconds to connect....(It sees much less advertise packets and for some seconds even none !)

Is there something i can do in my software to fix that? (i already transmit in +4). Are there any hardware recommendation to help the receiver sees more packets ?!

In my application the advertiser is located at one side of an iron door and the central is located on the other side so maybe that's explain the reduce in the RSSI.... and the missing advertiser packets.