nrf5340 stops transmitting after a few hours and does not recover. HCI ISO TX overrun on stream.

RE: nrf5340 stops transmitting after a few hours and does not recover. HCI ISO TX overrun on stream.

Susheel Nuguru — Fri, 25 Jul 2025 14:34:28 GMT

Hi Ran,

Sorry for delayed response. We should either get more logs or should be able to reproduce this at our desk .

Can you see if increasing the buffers on netcore might resolve this as suggested in this thread.

RE: nrf5340 stops transmitting after a few hours and does not recover. HCI ISO TX overrun on stream.

Ran531 — Sun, 13 Jul 2025 11:17:37 GMT

Hi, sorry for the late response.

By consistently, I mean that it does happen eventually within an hour or a few hours.

The error is:
HCI ISO TX overrun on stream 0x2001999c - single print.

From then on, advertising still works, but a receiver cannot sync anymore. I attached the debugger to the transmitter and while it does only print once, the same code path keeps getting hit. so it does not recover from the overrun.

SDK 2.9.0. What do you mean by nordic stack? the ipc_radio image? I based off of the nrf5340 audio example with no changed in that regard.

RE: nrf5340 stops transmitting after a few hours and does not recover. HCI ISO TX overrun on stream.

Elfving — Mon, 07 Jul 2025 11:59:10 GMT

Hi,

Is it possible to get some error log of this, or does the time it takes for this to occur essentially make that impossible?

And by consistently, do you mean that it takes the same amount of time?

What NCS version was this based on?

I assume you are using the Nordic stack and not just the Nordic host?

Regards,

Elfving