adding ethernet example, update for time

Author: brentru

examples/mqtt/adafruit_io_simpletest_eth.py

@@ -0,0 +1,96 @@
+# Example of using the Adafruit IO CircuitPython MQTT client
+# to subscribe to an Adafruit IO feed and publish random data
+# to be received by the feed.
+#
+# Example by Tony DiCola for Adafruit Industries
+# Modified by Brent Rubell for Adafruit Industries, 2019
+import time
+from random import randint
+
+
+import board
+import busio
+from adafruit_wiznet5k.adafruit_wiznet5k import WIZNET5K
+import adafruit_wiznet5k.adafruit_wiznet5k_socket as socket
+from digitalio import DigitalInOut
+from adafruit_io.adafruit_io import IO_MQTT
+import adafruit_minimqtt as MQTT
+
+# Get MQTT details and more from a secrets.py file
+try:
+    from secrets import secrets
+except ImportError:
+    print("MQTT secrets are kept in secrets.py, please add them there!")
+    raise
+
+cs = DigitalInOut(board.D10)
+spi_bus = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO)
+
+# Initialize ethernet interface with DHCP
+eth = WIZNET5K(spi_bus, cs)
+
+# Define callback functions which will be called when certain events happen.
+# pylint: disable=unused-argument
+def connected(client):
+    # Connected function will be called when the client is connected to Adafruit IO.
+    # This is a good place to subscribe to feed changes.  The client parameter
+    # passed to this function is the Adafruit IO MQTT client so you can make
+    # calls against it easily.
+    print("Connected to Adafruit IO!  Listening for DemoFeed changes...")
+    # Subscribe to changes on a feed named DemoFeed.
+    client.subscribe("DemoFeed")
+
+def subscribe(client, userdata, topic, granted_qos):
+    # 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 the client unsubscribes from a feed.
+    print('Unsubscribed from {0} with PID {1}'.format(topic, pid))
+
+# pylint: disable=unused-argument
+def disconnected(client):
+    # Disconnected function will be called when the client disconnects.
+    print("Disconnected from Adafruit IO!")
+
+# pylint: disable=unused-argument
+def message(client, feed_id, payload):
+    # Message function will be called when a subscribed feed has a new value.
+    # The feed_id parameter identifies the feed, and the payload parameter has
+    # the new value.
+    print("Feed {0} received new value: {1}".format(feed_id, payload))
+
+# Initialize MQTT interface with the ethernet interface
+MQTT.set_socket(socket, eth)
+
+# Initialize a new MQTT Client object
+mqtt_client = MQTT.MQTT(broker="http://io.adafruit.com",
+                        username=secrets["aio_user"],
+                        password=secrets["aio_key"])
+
+# Initialize an Adafruit IO MQTT Client
+io = IO_MQTT(mqtt_client)
+
+# Connect the callback methods defined above to Adafruit IO
+io.on_connect = connected
+io.on_disconnect = disconnected
+io.on_subscribe = subscribe
+io.on_unsubscribe = unsubscribe
+io.on_message = message
+
+# Connect to Adafruit IO
+print("Connecting to Adafruit IO...")
+io.connect()
+
+# Below is an example of manually publishing a new  value to Adafruit IO.
+last = 0
+print("Publishing a new message every 10 seconds...")
+while True:
+    # Explicitly pump the message loop.
+    io.loop()
+    # Send a new message every 10 seconds.
+    if (time.monotonic() - last) >= 5:
+        value = randint(0, 100)
+        print("Publishing {0} to DemoFeed.".format(value))
+        io.publish("DemoFeed", value)
+        last = time.monotonic()

examples/mqtt/adafruit_io_time.py

@@ -1,7 +1,7 @@
 # Adafruit IO provides some built-in MQTT topics
 # for obtaining the current server time, if you don't have
 # access to a RTC module.
-
+import time
 import board
 import busio
 from digitalio import DigitalInOut