Larger MTU results in HardFault

[Ken]

I'm running SDK 14.2 using FreeRTOS on a nrf52832.

When I increase NRF_SDH_BLE_GATT_MAX_MTU_SIZE to 158, the system ends up in Hard Fault.

Anyone have suggestions on where to being looking for the fault? The soft device has more than enough RAM, its actually telling me I can decrease it. I updated NRF_SDH_BLE_GAP_EVENT_LENGTH to 10, with no affect.

Any help is appreciated

[Dave_couling]

I get the same issue when I increase the MTU size.  It only hardfaults on a Connection, but advertises fine.  Did you end up solving this?

[Susheel Nuguru]

which example is it? did you try with the same SDK?

[Susheel Nuguru]

I could not reproduce it . Can you help me to reproduce this error Dave?

[Dave_couling]

I just took the freeRTOS example and increased the MTU to 247 and DL to 251.  Works fine until you connect.  It crashes during connection

[Susheel Nuguru]

sorry Dave, this thread skipped my queue, I did not see that you replied. Do you still have this problem ? I am confident that due to my delay in answer, you must have dug into it yourself. If you found the solution, can you please update us.

[Dave_couling]

I could not resolve this. Unfortunately I had to limit our MTU and DL settings for our product release.

[Susheel Nuguru]

i am wondering why I am not able to reproduce this. what is peer you are testing this with? I am guessing probably there are some old values in my FreeRTOSConfig.h file. Have you tried increasing the default configTOTAL_HEAP_SIZE in there? I normally use (4092 * 2) as default. But if you are limited by RAM, then try to increase it to (4092 + 2048).. I cannot think of anything else.