CCS/CC2650STK: Why I can't make MTU more than 23 bytes?

Part Number:CC2650STK

Tool/software: Code Composer Studio

Hi, everyone

I am using CC2650STK with BLE_SDK_2.2.2.25. My program is based on simple_peripheral. And I can't send packets with length more then 22 bytes.

I made all the changes as recommended in "SWRU393_CC2640_BLE_Software_Developer's_Guide.pdf":

MAX_PDU_SIZE                  255

MAX_NUM_PDU                   5

-DBLE_V42_FEATURES=EXT_DATA_LEN_CFG

And I use HCI_LE_WriteSuggestedDefaultDataLenCmd(APP_SUGGESTED_PDU_SIZE , APP_SUGGESTED_TX_TIME);

and HCI_LE_SetDataLenCmd.

Client device (Android) execute GATT_ExchangeMTU().

In BT logs on Android  I see, that  MTUReq is 251 but MTUResp from Sensortag is 23... It is imaged on attached picture.

And  one important thing else, HCI_LE_WriteSuggestedDefaultDataLenCmd return 0x01 (failed)... I don't know why...

Earlier HCI_LE_WriteSuggestedDefaultDataLenCmd returned 0x04 (MSG_BUFFER_NOT_AVAIL),  when I used AUTOHEAPSIZE. But now I use HEAPMGR_SIZE=6300.

Why return this function this error? What am I doing wrong?

Thanks in advance,

Karlin  Egor