add time topic example

Author: brentru

examples/mqtt/adafruit_io_mqtt_simpletest.py

@@ -79,27 +79,28 @@ def message(client, feed_id, payload):
 # Connect to WiFi
 wifi.connect()
 
-# Initialize a new MQTT Client
+# Initialize a new MQTT Client object
 client = MQTT(
     socket=socket,
     broker="io.adafruit.com",
     username=secrets["aio_user"],
     password=secrets["aio_key"],
     network_manager=wifi,
+    log=True,
 )
 
-# Setup the callback functions defined above.
-client.on_connect = connected
-client.on_disconnect = disconnected
-client.on_message = message
-
 # Initialize an Adafruit IO MQTT Client
 io = IO_MQTT(client)
 
+# Connect the callback methods defined above to Adafruit IO
+io.on_connect = connected
+io.on_disconnect = disconnected
+io.on_message = message
+
 # Connect to Adafruit IO
 io.connect()
 
-# You can call the message loop every X seconds
+# 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:
@@ -112,6 +113,7 @@ def message(client, feed_id, payload):
         io.publish("DemoFeed", value)
         last = time.monotonic()
 
+
 # You can also call loop_blocking if you only want to receive values.
 # NOTE: If uncommented, no code below this line will run.
 # io.loop_blocking()

examples/mqtt/adafruit_io_mqtt_time.py

@@ -0,0 +1,117 @@
+# 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
+from random import randint
+import board
+import neopixel
+import busio
+from digitalio import DigitalInOut
+from adafruit_esp32spi import adafruit_esp32spi
+from adafruit_esp32spi import adafruit_esp32spi_wifimanager
+import adafruit_esp32spi.adafruit_esp32spi_socket as socket
+
+from adafruit_minimqtt import MQTT
+from adafruit_io.adafruit_io import IO_MQTT
+
+### 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
+
+# If you are using a board with pre-defined ESP32 Pins:
+esp32_cs = DigitalInOut(board.ESP_CS)
+esp32_ready = DigitalInOut(board.ESP_BUSY)
+esp32_reset = DigitalInOut(board.ESP_RESET)
+
+# If you have an externally connected ESP32:
+# esp32_cs = DigitalInOut(board.D9)
+# esp32_ready = DigitalInOut(board.D10)
+# esp32_reset = DigitalInOut(board.D5)
+
+spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
+esp = adafruit_esp32spi.ESP_SPIcontrol(spi, esp32_cs, esp32_ready, esp32_reset)
+"""Use below for Most Boards"""
+status_light = neopixel.NeoPixel(
+    board.NEOPIXEL, 1, brightness=0.2
+)  # Uncomment for Most Boards
+"""Uncomment below for ItsyBitsy M4"""
+# status_light = dotstar.DotStar(board.APA102_SCK, board.APA102_MOSI, 1, brightness=0.2)
+# Uncomment below for an externally defined RGB LED
+# import adafruit_rgbled
+# from adafruit_esp32spi import PWMOut
+# RED_LED = PWMOut.PWMOut(esp, 26)
+# GREEN_LED = PWMOut.PWMOut(esp, 27)
+# BLUE_LED = PWMOut.PWMOut(esp, 25)
+# status_light = adafruit_rgbled.RGBLED(RED_LED, BLUE_LED, GREEN_LED)
+wifi = adafruit_esp32spi_wifimanager.ESPSPI_WiFiManager(esp, secrets, status_light)
+
+# Define callback functions which will be called when certain events happen.
+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!")
+    
+    # Subscribe to time/seconds topic
+    # https://io.adafruit.com/api/docs/mqtt.html#time-seconds
+    io.subscribe_to_time('seconds')
+
+    # Subscribe to time/millis topic
+    # https://io.adafruit.com/api/docs/mqtt.html#time-millis
+    io.subscribe_to_time('millis')
+
+    # Subscribe to time/ISO-8601 topic
+    # https://io.adafruit.com/api/docs/mqtt.html#time-iso-8601
+    io.subscribe_to_time('iso')
+
+    # Subscribe to time/hours topic
+    # NOTE: This topic only publishes once every hour.
+    # https://io.adafruit.com/api/docs/mqtt.html#adafruit-io-monitor
+    io.subscribe_to_time('hours')
+
+
+def disconnected(client):
+    # Disconnected function will be called when the client disconnects.
+    print("Disconnected from Adafruit IO!")
+
+
+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))
+
+
+# Connect to WiFi
+wifi.connect()
+
+# Initialize a new MQTT Client object
+client = MQTT(
+    socket=socket,
+    broker="io.adafruit.com",
+    username=secrets["aio_user"],
+    password=secrets["aio_key"],
+    network_manager=wifi,
+    log=True
+)
+
+# Initialize an Adafruit IO MQTT Client
+io = IO_MQTT(client)
+
+# Connect the callback methods defined above to Adafruit IO
+io.on_connect = connected
+io.on_disconnect = disconnected
+io.on_message = message
+
+# Connect to Adafruit IO
+io.connect()
+
+# Listen forever...
+io.loop_blocking()