From f9dea9d35b8337a9f24930698facf5b277226245 Mon Sep 17 00:00:00 2001
From: kieranm <kieranm>
Date: Tue, 9 Mar 2004 15:55:37 +0000
Subject: [PATCH] Kieran Mansley - kieranm@gtemail.net - 9th Mar 2004  - Added
 comment to tcp_write() to remind of the importance of call to    tcp_output()
 to send any enqueued data.

---
 src/core/tcp_out.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/core/tcp_out.c b/src/core/tcp_out.c
index a7cdc6be..d2964662 100644
--- a/src/core/tcp_out.c
+++ b/src/core/tcp_out.c
@@ -72,6 +72,14 @@ tcp_send_ctrl(struct tcp_pcb *pcb, u8_t flags)
 
 }
 
+/*
+ * NB. tcp_write() enqueues data for sending, but does not send it
+ * straight away.  It waits in the expectation of more data being sent
+ * soon (as it can send them more efficiently by combining them
+ * together).  To prompt the system to send data now, call
+ * tcp_output() after calling tcp_write().
+ */
+
 err_t
 tcp_write(struct tcp_pcb *pcb, const void *arg, u16_t len, u8_t copy)
 {