NRF_ERROR_NO_MEM on sd_ble_gatts_characteristic_add

[danbujak]

I occasionally get an NRF_ERROR_NO_MEM error when trying to add a custom characteristic. I'm only using 3860 bytes of ZI data, stack = 2048, heap = 2048 so it seems like I have lots of RAM available. What can be causing this error to happen only occasionally. Note that I add the characteristics on init, so the conditions are the same everytime (right after reset).

S110 SDK7.2

[RK]

You're running out of memory in the softdevice itself. Type NRF_ERROR_NO_MEM into the search box to find many previous discussions about this. You can move your characteristics to user space and if you are using a recent softdevice you can increase the size of the GATT table.

[danbujak]

Is there any reason this would only happen occasionally? I see it maybe 1 out of 10 resets.

[RK]

no it should happen every time if it's happening, unless there's any variation in the size of your characteristics, which sounds unlikely.