Increasing MTU size

[eyalasko]

Hi, 

I've added NUS service to my app (nRF52832, peripheral, FreeRTOS based, SDK 15.2, SD132). everything works great with MTU size = 23 bytes.

Now I try to increase the MTU size to 247 like in the example: 

- increased NRF_SDH_BLE_GATT_MAX_MTU_SIZE  23 -->247

- increased NRF_SDH_BLE_GAP_DATA_LENGTH  27-->251

- increased IRAM1 according to ram_start returned in nrf_sdh_ble_enable()

Now I keep failing in ble_nus_init() on the first call to characteristic_add() . It return error NRF_ERROR_NO_MEM .

I tried to increase IRAM1 start address even more, adding another 1300+ bytes to the start address (until my linker start yelling) but I can't get it to work.

Is it a matter of a further increase of the ram start address or am I missing here something (maybe another setting in sdk_config.h....??)

Thanks

 

[eyalasko]

one thing I didn't mention but might be relevant - there are 2 vendor-specific profiles added (custom profile + NUS)

[billtsai]

Try to increase NRF_SDH_BLE_VS_UUID_COUNT in sdk_config.h and see it returns NRF_SUCCESS or not.

[Sigurd]

If that does not work, next step would be to increase the NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE in sdk_config.h