diff --git a/prj.conf b/prj.conf
index 81d31da..8d3246a 100644
--- a/prj.conf
+++ b/prj.conf
@@ -5,6 +5,8 @@
 CONFIG_GPIO=y
 
 # Debug Message (RTT)
+# Build-time switch for project DBG_PRINTF/DBG_CORE/DBG_ERR macros.
+CONFIG_VESIS_DEBUG_PRINT=n
 # Zephyr logging subsystem enable.
 CONFIG_LOG=y
 # Print logs immediately when log API is called.
@@ -151,7 +153,7 @@ CONFIG_MCUMGR=y
 # Enable mcumgr/SMP messages over BLE SMP service.
 CONFIG_MCUMGR_TRANSPORT_BT=y
 # Require authenticated BLE connection for mcumgr read/write operations.
-CONFIG_MCUMGR_TRANSPORT_BT_PERM_RW_AUTHEN=n
+CONFIG_MCUMGR_TRANSPORT_BT_PERM_RW_AUTHEN=y
 # Reassemble SMP packets fragmented over BLE.
 CONFIG_MCUMGR_TRANSPORT_BT_REASSEMBLY=y
 # mcumgr transport receive buffer size for DFU image chunks.