I have a crash dump while using bl702_demo_event. I uploaded the log here:
https://drive.google.com/file/d/17aj6bhLqQIs9o3Ns_p01Q0w1R1Es1VNT/view?usp=sharing

(unfortunately, I couldn't upload it here)

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Another problem: I can't connect to the device from my phone.

# ble_start_adv 0 0 0x280 0x280
adv_type 0x0
mode 0x0
interval min 0x280
interval max 0x280
Advertising started

# Connected: 4D:FF:4F:78:C0:07 (random) 
Disconnected: 4D:FF:4F:78:C0:07 (random) (reason 62) 

Please advise.

One more thing: during the advertising, power consumption is way to high... above 5mA in average with spikes above 25mA. I think it never goes to PDS. Update: fixed, pds_start command should be used.