update examples

Author: brentru

examples/minimqtt_adafruitio_wifi.py

@@ -1,5 +1,3 @@
-# CircuitPython MiniMQTT Library
-# Adafruit IO SSL/TLS Example for WiFi (ESP32SPI)
 import time
 import board
 import busio

examples/minimqtt_pub_sub_nonblocking.py

@@ -1,5 +1,3 @@
-# CircuitPython MiniMQTT Library
-# Adafruit IO SSL/TLS Example for WiFi (ESP32SPI)
 import time
 import board
 import busio

examples/minimqtt_simpletest.py

@@ -52,27 +52,29 @@ def connect_wifi():
     print("Connected to", str(esp.ssid, 'utf-8'), "\tRSSI:", esp.rssi)
     print("IP: ", esp.pretty_ip(esp.ip_address))
 
-# MiniMQTT Callback Handlers
+# Define callback methods which are called when events occur
 # pylint: disable=unused-argument, redefined-outer-name
 def connect(client, userdata, flags, rc):
-    # This method is called when client.connect() is called.
+    # This function will be called when the client is connected
+    # successfully to the broker.
     print('Connected to MQTT Broker!')
     print('Flags: {0}\n RC: {1}'.format(flags, rc))
 
 def disconnect(client, userdata, rc):
-    # This method is called when client.disconnect() is called.
+    # This method is called when the client disconnects
+    # from the broker.
     print('Disconnected from MQTT Broker!')
 
 def subscribe(client, userdata, topic, granted_qos):
-    # This method is called when client.subscribe() is called.
+    # This method is called when the client subscribes to a new feed.
     print('Subscribed to {0} with QOS level {1}'.format(topic, granted_qos))
 
 def unsubscribe(client, userdata, topic, pid):
-    # This method is called when client.unsubscribe() is called.
+    # This method is called when the client unsubscribes from a feed.
     print('Unsubscribed from {0} with PID {1}'.format(topic, pid))
 
 def publish(client, userdata, topic, pid):
-    # This method is called when client.publish() is called.
+    # This method is called when the client publishes data to a feed.
     print('Published to {0} with PID {1}'.format(topic, pid))
 
 # Connect to WiFi