Merge pull request #20 from RichardA1/patch-1

Example for using miniMQTT with the PyPortal

examples/minimqtt_pub_sub_pyportal

@@ -0,0 +1,73 @@
+import time
+from adafruit_esp32spi import adafruit_esp32spi_wifimanager
+import adafruit_esp32spi.adafruit_esp32spi_socket as socket
+from adafruit_minimqtt import MQTT
+import adafruit_pyportal
+
+pyportal = adafruit_pyportal.PyPortal()
+
+### WiFi ###
+
+# Get wifi details and more from a secrets.py file
+try:
+    from secrets import secrets
+except ImportError:
+    print("WiFi secrets are kept in secrets.py, please add them there!")
+    raise
+
+wifi = adafruit_esp32spi_wifimanager.ESPSPI_WiFiManager(pyportal._esp, 
+                                                        secrets, None)
+
+# ------------- MQTT Topic Setup ------------- #
+mqtt_topic = 'test/topic'
+
+### Code ###
+# Define callback methods which are called when events occur
+# pylint: disable=unused-argument, redefined-outer-name
+def connected(client, userdata, flags, rc):
+    # This function will be called when the client is connected
+    # successfully to the broker.
+    print('Subscribing to %s' % (mqtt_topic))
+    client.subscribe(mqtt_topic)
+
+def disconnected(client, userdata, rc):
+    # This method is called when the client is disconnected
+    print('Disconnected from MQTT Broker!')
+
+def message(client, topic, message):
+    """Method callled when a client's subscribed feed has a new
+    value.
+    :param str topic: The topic of the feed with a new value.
+    :param str message: The new value
+    """
+    print('New message on topic {0}: {1}'.format(topic, message))
+
+# Connect to WiFi
+wifi.connect()
+
+# Set up a MiniMQTT Client
+mqtt_client = MQTT(socket,
+                   broker=secrets['broker'],
+                   username=secrets['user'],
+                   password=secrets['pass'],
+                   is_ssl=False,
+                   network_manager=wifi)
+
+# Setup the callback methods above
+mqtt_client.on_connect = connected
+mqtt_client.on_disconnect = disconnected
+mqtt_client.on_message = message
+
+# Connect the client to the MQTT broker.
+mqtt_client.connect()
+
+photocell_val = 0
+while True:
+    # Poll the message queue
+    mqtt_client.loop()
+
+    # Send a new message
+    print('Sending photocell value: %d' % photocell_val)
+    mqtt_client.publish(mqtt_topic, photocell_val)
+    photocell_val += 1
+    time.sleep(1)