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Not possible to enable constant BLE discovery: BLE discovery works for 10 seconds, then it waits 5 second and start again.

adapter.c

#define IDLE_DISCOV_TIMEOUT (5)
...
	/*
	 * In case the restart of the discovery failed, then just trigger
	 * it for the next idle timeout again.
	 */
	trigger_start_discovery(adapter, IDLE_DISCOV_TIMEOUT * 2);

...
		if (adapter->no_scan_restart_delay)
			trigger_start_discovery(adapter, 0);
		else
			trigger_start_discovery(adapter, IDLE_DISCOV_TIMEOUT);
		break;