Mesh Chat Model - Error Message = No free slots for new incoming segmented messages

[BlueMeshUK]

We are getting this message on our RELAY - via PuTTY.

"No free slots for new incoming segmented messages"

uart:~$ [01:00:53.683,380] <wrn> bt_mesh_transport: trans_seg: No free slots for new incoming segmented messages

then >>>

ASSERTION FAIL @ WEST_TOPDIR/zephyr/lib/os/ring_buffer.c:73

We are getting this error - using CHAT MODEL in MESH.  The RELAY gives us this same error message - we have increased the CONFIG_BT_MESH_ADV_BUF_COUNT value from 13 to 50.

We read here >>>  "No free slots" error while sending message  that adding a timing delay may help. 

We have not added a timing delay yet but lets say we use 0.1s between receiving and transmitting on to the proxy or the next Relay. Is this because of timing issues between the next available Tx slot being ready and the device being ready - or mistiming i should say.

How do we add a small delay?

We put this into our VS Code build - yes?

Please help if you can give us some information - many thanks.

We have nRF52840 BLE > nRF21540 DK as RELAY > nRF21540 DK as proxy.  

Thanks - Richard 

[BlueMeshUK]

Andreas - this would make life a LOT easier if 9 bytes was the default setting - i think it is set to Max 60 bytes by default - anyone reading this - start at 9 bytes and work up from there - dont start at the Nordic default or you may repeat our problems. 

[TimD]

Hi Andreas, unfortunately just been running another test with 9 byte messages and the relay and proxy crashed with the error ASSERTION FAIL @ WEST_TOPDIR/zephyr/lib/os/ring_buffer.c:73.

There is nothing in the log files that help.

[BlueMeshUK]

Hi Andreas - we have a commercial requirement to get this Sprint fixed - so it would be very helpful to help solve this issue with us ... FYI ... we moved from Wirepas to Bluetooth Mesh after some discussions with Nordic and we really need to get this sorted out now - if you need us to pay you a fee to solve the issue can you please send me a meeting link to richard:bluemeshsolutions.com so we can discuss together.  Thanks Richard 

[AHaug]

Hi, 

TimD said:

WEST_TOPDIR/zephyr/lib/os/ring_buffer.c:73.

There is nothing in the log files that help.

Could you post the contents of the log nonetheless? Could you also post a full device log?

TimD said:

Sorry I've just checked and the messages No free slots" error while sending message  are still appearing.

In the previous case you had a ring buffer error it stated that the ring buffer was full and that you needed to drain the buffer. Did you also ensure that the buffer was emptied or did you only increase the buffer size?

BlueMeshUK said:

discussions with Nordic and we really need to get this sorted out now - if you need us to pay you a fee to solve the issue can you please send me a meeting link to richard:bluemeshsolutions.com so we can discuss together.  Thanks Richard 

I would recommend that you stay in contact with your regional sales director regarding mapping your needs so they can look into them. Let me know if you need their contact information and I'll send it to you in a PM. 

Kind regards,
Andreas

[BlueMeshUK]

I have reached out to Claire Steed in the UK - is that the correct person?

Andreas in your answer above you mention ensuring empty the buffer - but you dont explain how to do this - can you be clear in your reply - what is the parameter or commend to drain the buffer please - it would make your reply much more useful to us if you recommend and then explain or demonstrate - thanks - Richard