When nrf52840 Dongle receives LL_SLAVE_FEATURE_REQ, it returns LL_UNKNOWN_RSP. What is the reason?

[kxct]

I am using nrf52840's dongle development software, and I found that when the slave device sends LL_SLAVE_FEATURE_REQ , the host will return LL_UNKNOWN_RSP. I want to know why this is?

Dongle is a central device, using nrf-ble-driver-4.1.4 firmware and software. Softdevice S140 V6.1.1

[Hung Bui]

Hi kxct, 

Our softdevice doesn't support slave-initialized feature exchange that's why it return LL_UNKNOWN_RSP. 

[kxct]

Hi Hung Bui

Thank you, how can the host side initiate feature exchange?

[Hung Bui]

Hi, 

As far as I know the softdevice can handle host side initiate feature exchange from the peer (send LL_FEATURE_RSP to LL_FEATURE_REQ) but we don't proactively send LL_FEATURE_REQ

[kxct]

Thank you for your answer

[Adrian B.]

Hi Hung,

Is this limitation also in the Softdevice S132 V7.x.x?

Thank you in advance.