From 94df17720e0db3f6e1b35421ca599b1c2d7b2704 Mon Sep 17 00:00:00 2001
From: Mark Cheverton <mark.cheverton@ecafe.org>
Date: Fri, 29 Nov 2013 00:18:55 +0000
Subject: [PATCH] Added check for valid QOS (0 or 1)

---
 PubSubClient/PubSubClient.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/PubSubClient/PubSubClient.cpp b/PubSubClient/PubSubClient.cpp
index 53380bb..27f37a6 100755
--- a/PubSubClient/PubSubClient.cpp
+++ b/PubSubClient/PubSubClient.cpp
@@ -306,6 +306,9 @@ boolean PubSubClient::subscribe(char* topic) {
 }
 
 boolean PubSubClient::subscribe(char* topic, uint8_t qos) {
+   if (qos < 0 || qos > 1)
+     return false;
+
    if (connected()) {
       // Leave room in the buffer for header and variable length field
       uint16_t length = 5;