On 52832, SDK V14.0.0, SD132-5.0
I tried to set NRF_SDH_BLE_GATT_MAX_MTU_SIZE to 247, as from dev-doc i saw that SD132 supports BLE V4.2 DLE.
However it returns:
ble_gatt: sd_ble_gap_data_length_update() (request) on connection 0x0 returned unexpected value 0x13.
When set MAX_MTU_SIZE to 23 this issue disappear.