From 15713af468fe02581a767ff645b201c5497f1489 Mon Sep 17 00:00:00 2001
From: ladyada <limor@ladyada.net>
Date: Tue, 20 Oct 2015 23:51:03 -0400
Subject: [PATCH] switch to MQTT 3.1.1 by default

---
 Adafruit_MQTT.cpp | 6 ++++++
 Adafruit_MQTT.h   | 3 ++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/Adafruit_MQTT.cpp b/Adafruit_MQTT.cpp
index 5558a65..c319384 100644
--- a/Adafruit_MQTT.cpp
+++ b/Adafruit_MQTT.cpp
@@ -287,7 +287,13 @@ uint8_t Adafruit_MQTT::connectPacket(uint8_t *packet) {
   p+=2;
   // fill in packet[1] last
 
+#if (MQTT_PROTOCOL_LEVEL == 4)
+  p = stringprint_P(p, PSTR("MQTT"));
+#elif (MQTT_PROTOCOL_LEVEL == 3)
   p = stringprint_P(p, PSTR("MQIsdp"));
+#else
+  #error "No MQTT version selected!"
+#endif
 
   p[0] = MQTT_PROTOCOL_LEVEL;
   p++;
diff --git a/Adafruit_MQTT.h b/Adafruit_MQTT.h
index e18110e..9d9fc71 100644
--- a/Adafruit_MQTT.h
+++ b/Adafruit_MQTT.h
@@ -45,7 +45,8 @@
   #define DEBUG_PRINTBUFFER(buffer, len) {}
 #endif
 
-#define MQTT_PROTOCOL_LEVEL 3
+// Use 3 (MQTT 3.0) or 4 (MQTT 3.1.1)
+#define MQTT_PROTOCOL_LEVEL 4
 
 #define MQTT_CTRL_CONNECT 0x01
 #define MQTT_CTRL_CONNECTACK 0x02