Assistance Needed for Runtime change LE 1M PHY to LE 2M PHY on nRF5340 for Faster DFU Process

[Kaushik Parsana]

Dear Nordic Team,

We are currently developing a smart door lock using the nRF5340 and have started with the Matter lock sample demo code on our custom hardware.

To optimize the DFU process over SMP, we aim to switch from LE 1M PHY to LE 2M PHY at runtime. To achieve this, we have enabled the following configurations in our lock(BLE Peripheral) prj.conf file:

CONFIG_BT_PHY_UPDATE=y
CONFIG_BT_AUTO_PHY_UPDATE=n
CONFIG_BT_USER_PHY_UPDATE=y

However, when attempting to change the PHY from LE 1M to LE 2M using the nRF Connect app on an Android device, the PHY does not switch as expected.

Could you please advise if there are additional configurations or steps we need to implement to enable this functionality?

Thank you for your assistance.

Best regards,
Kaushik Parsana

[Hung Bui]

Hi Kaushik, 

The sniffer trace you provided unfortunately doesn't capture any connection, only advertising packets. 
Please follow our guide here to know how to use the sniffer to capture a connection: https://academy.nordicsemi.com/courses/bluetooth-low-energy-fundamentals/lessons/lesson-6-bluetooth-le-sniffer/

Could you send us your .config file ? (in both the application build folder and the hci_rpmsg build folder inside the application build folder)
Have you made sure you added this 

CONFIG_BT_CTLR_PHY_2M=y

To both the prj.conf and hci_rpmsg.conf file inside child_image folder ? 

[Kaushik Parsana]

Hi Hung,

My problem got resolved after added CONFIG_BT_CTLR_PHY_2M=y this configuration inside the child image folder prj.conf file.

For application added below changes.

CONFIG_BT_AUTO_PHY_UPDATE=n
CONFIG_BT_USER_PHY_UPDATE=y

Thanks 

Kaushik Parsana