Changing Advertising Events Interval with NimBLE

[alexshield]

Hi, I' dream to set advertise interval (advInterval) to 5000 ms. So, due to Bluetooth SIG 4.4.2.2.1,
T_advEvent = advInterval + advDelay
advInterval = 5000/0.625 = 8000,
I put this into the

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struct ble_hs_adv_fields fields

:

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...
fields.adv_itvl_is_present = 1;
fields.adv_itvl = (uint16_t) 8000;
...
int rc = ble_gap_adv_set_fields(&fields);
printf("ERROR CHECK IS %d", rc)

every thing is compiled and work correctly except interval of advertising. It stable and aprx 2 sec. Also I cann't find the example project with adv interval changings with Nimble stack.
p.s. i'm tried with idf 4.3 and 4.2.2