Unable to talk to IOS11 phone

RE: Unable to talk to IOS11 phone

anealca — Thu, 21 Jan 2021 15:16:38 GMT

It turns out that iOS10 and newer requires the use of an MTU size of 185. This is concerning since BLE certification expects the normal MTU size.

RE: Unable to talk to IOS11 phone

Kenneth — Wed, 06 Jan 2021 15:52:30 GMT

If you are using the latest nRF sniffer with an nRF52-DK you should be able to also sniff 2Mbps I believe:
https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Sniffer-for-Bluetooth-LE

Is that what you are doing?

Can you share the sniffer log before switching to 2Mbps?

RE: Unable to talk to IOS11 phone

anealca — Wed, 06 Jan 2021 15:35:12 GMT

I know I am not calling the update request ftn from the peripheral except in that event...

The problem with the sniffer logs is it doesn't switch to 2Msps. So the sniffer stops recording as soon as they switch to the higher link speed. I do not know how to get the sniffer to also switch to 2Msps.

RE: Unable to talk to IOS11 phone

Kenneth — Wed, 06 Jan 2021 13:42:43 GMT

Hi,

I suspect we need an on-air sniffer log (e.g. using nRF sniffer) to see what is actually occurring here. However if you suspect it is related to RF_PHY update, you can check if you may be calling sd_ble_gap_phy_update() somewhere in the application on the peripheral outside of the BLE_GAP_EVT_PHY_UPDATE_REQUEST event.

Kenneth