Advertising and Performing a Connection Over 2MPHY (2Mbps)

[Youssif]

Hi

I would like to perform a connection over 2MPHY instead of 1MPHY; is there an example to show this? This should be doable according to the softdevice v6.1.0 changelog. I tried setting the secondary advertising channel to 2MPHY (ble_gap_adv_params->secondary_phy) and that worked fine. However, when I set the connection PHYs to 2MPHY (ble_gap_scan_params->scan_phys) I get an NRF_FAULT as follows:-

NRF_FAULT: id=ME\01  pc=0x20296  info=536935719

I then tried setting the connection PHYs to 1MPHY and the connection succeeded, however, through the sniffer I can see that the connection is being performed over 1MPHY and not 2MPHY. Please note that in both of the above cases I set the connection type to extended (ble_gap_scan_params->extended) and set the advertising type to BLE_GAP_ADV_TYPE_EXTENDED_CONNECTABLE_NONSCANNABLE_UNDIRECTED.

I am using the nRF52832 with softdevice S132 v6.1.0 and SDK 15.0.0.

Thanks

Youssif

[Susheel Nuguru]

Hi,

The stack team noticed that this could be caused do to some null parameters in the arguments in connect request. 

I believe the workaround for 6.1 is to set scan_phys = 1M | 2M

Note: For 6.1, there is no way for the application to disallow to create a connection on 1M. The behavior may remain the same or change is a possible 6.2 or 6.1.1 (if such a SoftDevice is released).

To disallow establishing connections on CODED: Do not use extended scanning
To disallow establishing connections on 2M: Do not use extended scanning

[Youssif]

Thanks a lot, I was able to establish a connection over 2MPHY and verified with a sniffer. However, from your sentence:- "For 6.1 there is no way for the application to disallow to create a connection on 1M" it seems that you are implying that a connection will always occur on 1MPHY?

[Susheel Nuguru]

What I mean't was about the feature to say explicitly disallow connection or reject connections based on PHY.  Disallowing or restricting 1 PHY .explicitly is not possible right now, does not mean that you can only establish connections on 1M PHY

What you wanted was to allow connection on specific PHY, they are two different features.

[Youssif]

Oh I see, that makes sense. Thank you for your answer.