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An answer on Bluetooth LE scan as non root? indicates that with hcitool lescan an "Operation not permitted" error is generated by a writev system call (in hci.c).

hci_le_set_scan_parameters -> hci_send_req -> hci_send_cmd -> writev

What's so special about a Bluetooth LE scan compared to a normal Bluetooth scan?

PS: It reminds me of Torvalds quote: requiring root password for mundane things is “moronic”. There must be a very good reason for this, I hope.

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