From 96ec8e480b457c1bdf671a4092e5163ac325b537 Mon Sep 17 00:00:00 2001
From: Markus Sattler <help.markus+git@gmail.com>
Date: Mon, 6 Apr 2015 18:41:44 +0200
Subject: [PATCH] add size check to write some more debug output

---
 libraries/ESP8266WiFi/src/include/ClientContext.h | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/libraries/ESP8266WiFi/src/include/ClientContext.h b/libraries/ESP8266WiFi/src/include/ClientContext.h
index 06b8f7a64..34ef1b257 100644
--- a/libraries/ESP8266WiFi/src/include/ClientContext.h
+++ b/libraries/ESP8266WiFi/src/include/ClientContext.h
@@ -182,14 +182,22 @@ public:
 
     size_t write(const char* data, size_t size)
     {
-    	if (!_pcb)
+    	if (!_pcb) {
+    	    DEBUGV(":wr !_pcb\r\n");
     		return 0;
+    	}
+
+		if(size == 0) {
+			return 0;
+		}
 
     	size_t room = tcp_sndbuf(_pcb);
     	size_t will_send = (room < size) ? room : size;
     	err_t err = tcp_write(_pcb, data, will_send, 0);
-    	if (err != ERR_OK)
+    	if (err != ERR_OK) {
+    		DEBUGV(":wr !ERR_OK\r\n");
     		return 0;
+    	}
 
     	_size_sent = will_send;
         DEBUGV(":wr\r\n");