From 50ea321f66aa0a2486ee3a48f61c1810420ae8f0 Mon Sep 17 00:00:00 2001
From: "DSTO\\pivatom" <michael.pivato@dst.defence.gov.au>
Date: Tue, 18 Dec 2018 10:15:04 +1030
Subject: [PATCH] Add some comments

---
 Messaging/mqttsession.py | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/Messaging/mqttsession.py b/Messaging/mqttsession.py
index f791b64..bbad0b7 100644
--- a/Messaging/mqttsession.py
+++ b/Messaging/mqttsession.py
@@ -3,8 +3,13 @@ import paho.mqtt.client as mqtt
 client = None
 host = None
 
+"""
+Wrapper module for paho mqtt library, providing a singleton instance of the client to be used. 
+"""
+
 # Arguably not needed, just want to make the client static, but here anyway.
 def connect():
+    global client
     if client is None or host is None:
         print("Error: Client and/or host are not initialised.")
     else:
@@ -12,6 +17,7 @@ def connect():
         client.loop_start()
 
 def disconnect():
+    global client
     if client is not None:
         client.loop_stop()
         client.disconnect()
@@ -19,7 +25,8 @@ def disconnect():
         print("Error: Client is not initialised.")
 
 def Client():
-    if client is not None:
-        return mqtt.Client()
-    else:
-        return client
+    global client
+    if client is None:
+        client =  mqtt.Client()
+
+    return client