bugID:18002569:[bt] Restore bt l2cap packet MTU to 65 is SMP.
* range 65 to 2000 if SMP enabled,otherwise range 23 to 2000
*/
#ifndef CONFIG_BT_L2CAP_TX_MTU
+#ifdef CONFIG_BT_SMP
+#define CONFIG_BT_L2CAP_TX_MTU 65
+#else
#define CONFIG_BT_L2CAP_TX_MTU 23
#endif
+#endif
/**
* CONFIG_BT_ATT_PREPARE_COUNT: Number of buffers available for ATT prepare
