Hello everyone,
I'm dealing with mcumgr-cli to exchange commands between a host machine (running Ubuntu 20.04 LTS) and a NRF52833 DK running smp_svr sample. I'm using NCS V1.5.0
In the host machine, I'm using a NRF52840 Dongle running hci_usb sample as an adapter (hci0). I see the .config file opted for using the Softdevice as the Controller side of the stack (CONFIG_BT_LL_SOFTDEVICE=y).
When I run mcumgr --conntype ble --connstring ctlr_name=hci0,peer_name=Zephyr echo hello, the command fails displaying the following message:
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The curious thing comes now: if I build the hci_usb sample using Zephyr's BLE Controller Stack (CONFIG_BT_LL_SW_SPLIT=y) and load it in the dongle, then the command executes successfully:

I'm attaching the hci trace for both cases (with hci_usb running on CONFIG_BT_LL_SOFTDEVICE and when running on CONFIG_BT_LL_SW_SPLIT), captured with btmon.


As a reference, my setup has go1.16.2 and mcumgr 0.0.0-dev.
Could you provide some guidance on why this occurs and if there are any settings I could configure to have compatibility between the hci_usb sample w/ softdevice ctlr stack and the mcumgr tool?
Best regards,
Luis.