Thanks for the suggestion! I think I tried it but I got into some other trouble. But I'll make another try and see where it leads.
The thing is, we don't simply want to use BT only. We want to have BT always on, and then turn on WiFi sometimes, but keep it off most of the time to save power.
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I have reproduced the issue by using wwd_management_wifi_off in hello_sensor snip and found that after wifi_off API the functionality of BT has be halted. I will raise this internally and let you know.