diff --git a/samples/net/lwm2m_client/overlay-queue.conf b/samples/net/lwm2m_client/overlay-queue.conf
index 946c0fbab67..2f2ee2aceaa 100644
--- a/samples/net/lwm2m_client/overlay-queue.conf
+++ b/samples/net/lwm2m_client/overlay-queue.conf
@@ -1,5 +1,12 @@
 CONFIG_LWM2M_QUEUE_MODE_ENABLED=y
-CONFIG_LWM2M_QUEUE_MODE_UPTIME=20
+
+# Listen for incoming CoAP messages for 30 seconds after last TX.
+# This is a common NAT timeout for cellular networks.
+CONFIG_LWM2M_QUEUE_MODE_UPTIME=30
+
+# When DTLS Connection Identifier is used, we can keep socket open
+# and just stop polling while in idle state (QUEUE_RX_OFF).
+# If the server does not support DTLS-CID, use
 CONFIG_LWM2M_RD_CLIENT_STOP_POLLING_AT_IDLE=y
 
 # Default lifetime is 1 day