diff --git a/net/tcp/tcp_send_buffered.c b/net/tcp/tcp_send_buffered.c
index a8218d7922a..fc49cb9a731 100644
--- a/net/tcp/tcp_send_buffered.c
+++ b/net/tcp/tcp_send_buffered.c
@@ -94,6 +94,44 @@
  * Private Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: tcp_inqueue_wrb_size
+ *
+ * Description:
+ *   Get the in-queued write buffer size from connection
+ *
+ * Input Parameters:
+ *   conn - The TCP connection of interest
+ *
+ * Assumptions:
+ *   Called from user logic with the network locked.
+ *
+ ****************************************************************************/
+
+static uint32_t tcp_inqueue_wrb_size(FAR struct tcp_conn_s *conn)
+{
+  FAR struct tcp_wrbuffer_s *wrb;
+  FAR sq_entry_t *entry;
+  uint32_t total = 0;
+
+  if (conn)
+    {
+      for (entry = sq_peek(&conn->unacked_q); entry; entry = sq_next(entry))
+        {
+          wrb = (FAR struct tcp_wrbuffer_s *)entry;
+          total += TCP_WBPKTLEN(wrb);
+        }
+
+      for (entry = sq_peek(&conn->write_q); entry; entry = sq_next(entry))
+        {
+          wrb = (FAR struct tcp_wrbuffer_s *)entry;
+          total += TCP_WBPKTLEN(wrb);
+        }
+    }
+
+  return total;
+}
+
 /****************************************************************************
  * Name: psock_insert_segment
  *
diff --git a/net/udp/udp_sendto_buffered.c b/net/udp/udp_sendto_buffered.c
index cefe8a30cda..899b3d5e9aa 100644
--- a/net/udp/udp_sendto_buffered.c
+++ b/net/udp/udp_sendto_buffered.c
@@ -105,6 +105,38 @@ static uint16_t sendto_eventhandler(FAR struct net_driver_s *dev,
  * Private Functions
  ****************************************************************************/
 
+/****************************************************************************
+ * Name: udp_inqueue_wrb_size
+ *
+ * Description:
+ *   Get the in-queued write buffer size from connection
+ *
+ * Input Parameters:
+ *   conn - The UDP connection of interest
+ *
+ * Assumptions:
+ *   Called from user logic with the network locked.
+ *
+ ****************************************************************************/
+
+static uint32_t udp_inqueue_wrb_size(FAR struct udp_conn_s *conn)
+{
+  FAR struct udp_wrbuffer_s *wrb;
+  FAR sq_entry_t *entry;
+  uint32_t total = 0;
+
+  if (conn)
+    {
+      for (entry = sq_peek(&conn->write_q); entry; entry = sq_next(entry))
+        {
+          wrb = (FAR struct udp_wrbuffer_s *)entry;
+          total += wrb->wb_iob->io_pktlen;
+        }
+    }
+
+  return total;
+}
+
 /****************************************************************************
  * Name: sendto_writebuffer_release
  *