define the missing MQTT control packets

Adafruit_MQTT.h

@@ -47,20 +47,27 @@
 
 #define MQTT_PROTOCOL_LEVEL 4
 
-#define MQTT_CTRL_CONNECT 0x01
-#define MQTT_CTRL_CONNECTACK 0x02
-#define MQTT_CTRL_PUBLISH 0x03
-#define MQTT_CTRL_SUBSCRIBE 0x08
-#define MQTT_CTRL_SUBACK 0x09
-#define MQTT_CTRL_PINGREQ 0x0C
-#define MQTT_CTRL_PINGRESP 0x0D
+#define MQTT_CTRL_CONNECT     0x1
+#define MQTT_CTRL_CONNECTACK  0x2
+#define MQTT_CTRL_PUBLISH     0x3
+#define MQTT_CTRL_PUBACK      0x4
+#define MQTT_CTRL_PUBREC      0x5
+#define MQTT_CTRL_PUBREL      0x6
+#define MQTT_CTRL_PUBCOMP     0x7
+#define MQTT_CTRL_SUBSCRIBE   0x8
+#define MQTT_CTRL_SUBACK      0x9
+#define MQTT_CTRL_UNSUBSCRIBE 0xA
+#define MQTT_CTRL_UNSUBSACK   0xB
+#define MQTT_CTRL_PINGREQ     0xC
+#define MQTT_CTRL_PINGRESP    0xD
+#define MQTT_CTRL_DISCONNECT  0xE
 
 #define MQTT_QOS_1 0x1
 #define MQTT_QOS_0 0x0
 
 #define CONNECT_TIMEOUT_MS 3000
 #define PUBLISH_TIMEOUT_MS 500
-#define PING_TIMEOUT_MS 500
+#define PING_TIMEOUT_MS    500
 
 // Adjust as necessary, in seconds.  Default to 5 minutes.
 #define MQTT_CONN_KEEPALIVE 300
@@ -70,15 +77,15 @@
 // 23 char client ID.
 #define MAXBUFFERSIZE (125)
 
-#define MQTT_CONN_USERNAMEFLAG 0x80
-#define MQTT_CONN_PASSWORDFLAG 0x40
-#define MQTT_CONN_WILLRETAIN   0x20
-#define MQTT_CONN_WILLQOS   0x08
-#define MQTT_CONN_WILLFLAG   0x04
-#define MQTT_CONN_CLEANSESSION   0x02
+#define MQTT_CONN_USERNAMEFLAG    0x80
+#define MQTT_CONN_PASSWORDFLAG    0x40
+#define MQTT_CONN_WILLRETAIN      0x20
+#define MQTT_CONN_WILLQOS_1       0x08
+#define MQTT_CONN_WILLQOS_2       0x18
+#define MQTT_CONN_WILLFLAG        0x04
+#define MQTT_CONN_CLEANSESSION    0x02
 
-// how many subscriptions we want to be able to
-// track
+// how many subscriptions we want to be able to track
 #define MAXSUBSCRIPTIONS 5
 
 // how much data we save in a subscription object