Restart advertising fails with -ENOMEM

RE: Restart advertising fails with -ENOMEM

Priyanka — Mon, 23 Feb 2026 13:53:18 GMT

Hi Bert,

So, it's not possible to restart advertising directly in the disconnected callback, as this callback is running in interrupt context.

This could be worth a shot, but could you maybe try setting

CONFIG_BT_MAX_CONN=4

Then check if you still get the error?

-Priyanka

RE: Restart advertising fails with -ENOMEM

BertL — Mon, 23 Feb 2026 10:41:55 GMT

Hi Priyanka thanks for your response!

I will investigate the ticket you mentioned. But it is still weird that you can only get out of this situation with a reset of the device, right? I can imagine that I will get errors if I try to start or update advertising when it is still busy, but I would expect it to be working again if I try a little bit later. That's not what happening, once I will get the -ENOMEM error, the only way to get out of it is a reset of the device. Is this a known issue?

RE: Restart advertising fails with -ENOMEM

Priyanka — Fri, 13 Feb 2026 15:01:24 GMT

Hi Bert,

-12 (-ENOMEM) might be occurring because there might be some overlapping start sequences.

Accidently you might be trying to start a new advertising context, before the previous one has stopped completely.

Maybe you can take a look at the solution mentioned in this ticket.

-Priyanka