1CONFIG_BT=y 2CONFIG_BT_CENTRAL=y 3CONFIG_BT_DEVICE_NAME="Zephyr Central MTU Update Sample" 4CONFIG_BT_MAX_CONN=1 5 6CONFIG_BT_GATT_CLIENT=y 7 8CONFIG_LOG=y 9CONFIG_BT_L2CAP_LOG_LEVEL_DBG=y 10 11# HCI ACL buffers size 12# BT_L2CAP_RX_MTU = CONFIG_BT_BUF_ACL_RX_SIZE - BT_L2CAP_HDR_SIZE 13CONFIG_BT_BUF_ACL_RX_SIZE=251 14 15# L2CAP SDU/PDU TX MTU 16CONFIG_BT_L2CAP_TX_MTU=247 17