From 5494128faf704cffa8d59f4ca62242831514eee4 Mon Sep 17 00:00:00 2001
From: Andy Green <andy@warmcat.com>
Date: Fri, 12 Jan 2018 09:52:14 +0800
Subject: [PATCH] test-echo: handle WRITABLE callback when nothing to send

---
 test-apps/test-echo.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/test-apps/test-echo.c b/test-apps/test-echo.c
index 0691b04b..ab75e19b 100644
--- a/test-apps/test-echo.c
+++ b/test-apps/test-echo.c
@@ -73,7 +73,8 @@ callback_echo(struct lws *wsi, enum lws_callback_reasons reason, void *user,
 
 	case LWS_CALLBACK_SERVER_WRITEABLE:
 do_tx:
-
+		if ((int)pss->len == -1)
+			break;
 		n = LWS_WRITE_CONTINUATION;
 		if (!pss->continuation) {
 			if (pss->binary)