BLE Advertisement interval 10ms-20ms

RE: BLE Advertisement interval 10ms-20ms

Karl Ylvisaker — Fri, 05 Jan 2024 12:58:48 GMT

Hello,

Thank you for the clarifications.

Please note that the advertising interval is defined as N*0.625 ms, which in your case places the min and max at 5-10ms, which is lower than the lower boundary for advertising intervals (except for high-duty directed advertising) which is 20 ms.
There will also be added a random delay of 0-10 ms to your advertising interval, to avoid repeated collisions, which you can see in the power profiler trace.

This slipped my mind earlier, apologies for any confusion this might have caused! :)

Still it is strange that you did not see any returned error codes, however - perhaps the logging is not set up correctly.

Best regards,
Karl

RE: BLE Advertisement interval 10ms-20ms

hari — Thu, 04 Jan 2024 11:46:26 GMT

CONFIG_GPIO=y
CONFIG_BT=y
CONFIG_BT_BROADCASTER=y
CONFIG_BT_HCI_VS_EXT=y
CONFIG_BT_HCI=y
CONFIG_SERIAL=y

[quote userid="87869" url="~/f/nordic-q-a/107099/ble-advertisement-interval-10ms-20ms/462624"]Was this the only change you made to the project?[/quote]

Yes! this is my pro.conf

[quote userid="87869" url="~/f/nordic-q-a/107099/ble-advertisement-interval-10ms-20ms/462624"]What was the returned error code from the bt_le_adv_start call to start advertising?[/quote]

Currently, no error code is being returned. Additionally, I am unable to observe any advertisement packets on the NRF52840 dongle Bluetooth sniffer.

#define BT_GAP_ADV_FAST_INT_MIN_1_10ms 0x0008
#define BT_GAP_ADV_FAST_INT_MIN_1_20ms 0x0016


#define BT_LE_ADV_NCONN_30 BT_LE_ADV_PARAM(BT_LE_ADV_OPT_USE_IDENTITY, BT_GAP_ADV_FAST_INT_MIN_1_10ms, \
                                           BT_GAP_ADV_FAST_INT_MIN_1_20ms, NULL)

void my_func(void)
{
   int err;

   err = bt_enable(NULL);

   if (err)
   {
     printk("Bluetooth init failed (err %d)\n", err);
     return;
   }
   err = bt_le_adv_start(BT_LE_ADV_NCONN_30, ad, ARRAY_SIZE(ad),
                              NULL, 0);
   if (err)
   {
     printk(" Advertisement failed (err %d)\n", err);
     return;
   }
   k_sleep(K_MSEC(100)); 

   err = bt_le_adv_stop();
   if (err)
   {
     printk("Advertising failed to stop (err %d)\n", err);
     return;
   }

   err = bt_disable();
   if (err)
   {
     printk("Bluetooth disable failed (err %d)\n", err);
     return;
   }  
}



int main(void)
{
  /*other logics*/
  while (1)
  {
    my_func();
    k_sleep(K_MSEC(2000));
  }
	return 0;
}

1.This is my observation from the power profiler, and I have attached an image from the power profiler for your reference.
which is

[quote userid="124389" url="~/f/nordic-q-a/107099/ble-advertisement-interval-10ms-20ms"]"BT_GAP_ADV_FAST_INT_MIN_1 = 0x0030" and "BT_GAP_ADV_FAST_INT_MAX_1 = 0x0060,"[/quote]

2.After changing this value i get this

[quote userid="124389" url="~/f/nordic-q-a/107099/ble-advertisement-interval-10ms-20ms"]"BT_GAP_ADV_FAST_INT_MIN_1_10ms = 0x0008" and "BT_GAP_ADV_FAST_INT_MIN_1_20ms = 0x0016,"[/quote]

RE: BLE Advertisement interval 10ms-20ms

Karl Ylvisaker — Thu, 04 Jan 2024 08:23:29 GMT

Hello,

[quote user=""]Now, I want to set the advertisement interval to 10ms-20ms. I attempted to use custom definitions such as "BT_GAP_ADV_FAST_INT_MIN_1_10ms = 0x0008" and "BT_GAP_ADV_FAST_INT_MIN_1_20ms = 0x0016," but it did not work; there was no advertisement occurring.[/quote]

Was this the only change you made to the project?

What was the returned error code from the bt_le_adv_start call to start advertising?

Best regards,
Karl