1  import random
  2  import time
  3  import board
  4  import busio
  5  from digitalio import DigitalInOut
  6  import neopixel
  7  from adafruit_esp32spi import adafruit_esp32spi, adafruit_esp32spi_wifimanager
  8  import adafruit_esp32spi.adafruit_esp32spi_socket as socket
  9  from adafruit_ntp import NTP
 10  
 11  # Get wifi details and more from a secrets.py file
 12  try:
 13      from secrets import secrets
 14  except ImportError:
 15      print("WiFi secrets are kept in secrets.py, please add them there!")
 16      raise
 17  
 18  # ESP32 Setup
 19  try:
 20      esp32_cs = DigitalInOut(board.ESP_CS)
 21      esp32_ready = DigitalInOut(board.ESP_BUSY)
 22      esp32_reset = DigitalInOut(board.ESP_RESET)
 23  except AttributeError:
 24      esp32_cs = DigitalInOut(board.D13)
 25      esp32_ready = DigitalInOut(board.D11)
 26      esp32_reset = DigitalInOut(board.D12)
 27  
 28  spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
 29  esp = adafruit_esp32spi.ESP_SPIcontrol(spi, esp32_cs, esp32_ready, esp32_reset)
 30  
 31  """Use below for Most Boards"""
 32  status_light = neopixel.NeoPixel(board.NEOPIXEL, 1, brightness=0.2)  # Uncomment for Most Boards
 33  """Uncomment below for ItsyBitsy M4"""
 34  # status_light = dotstar.DotStar(board.APA102_SCK, board.APA102_MOSI, 1, brightness=0.2)
 35  # Uncomment below for an externally defined RGB LED
 36  # import adafruit_rgbled
 37  # from adafruit_esp32spi import PWMOut
 38  # RED_LED = PWMOut.PWMOut(esp, 26)
 39  # GREEN_LED = PWMOut.PWMOut(esp, 27)
 40  # BLUE_LED = PWMOut.PWMOut(esp, 25)
 41  # status_light = adafruit_rgbled.RGBLED(RED_LED, BLUE_LED, GREEN_LED)
 42  wifi = adafruit_esp32spi_wifimanager.ESPSPI_WiFiManager(esp, secrets, status_light)
 43  
 44  print("Connecting to WiFi...")
 45  
 46  wifi.connect()
 47  
 48  print("Connected to WiFi!")
 49  
 50  print("Getting the time...")
 51  
 52  ntp = NTP(esp)
 53  # Wait for a valid time to be received
 54  while not ntp.valid_time:
 55      time.sleep(5)
 56      ntp.set_time()
 57  
 58  print("Time:", str(time.time()))
 59  
 60  # You will need an Azure subscription to create an Azure IoT Hub resource
 61  #
 62  # If you don't have an Azure subscription:
 63  #
 64  # If you are a student, head to https://aka.ms/FreeStudentAzure and sign up, validating with your
 65  #  student email address. This will give you $100 of Azure credit and free tiers of a load of
 66  #  service, renewable each year you are a student
 67  #
 68  # If you are not a student, head to https://aka.ms/FreeAz and sign up to get $200 of credit for 30
 69  #  days, as well as free tiers of a load of services
 70  #
 71  # Create an Azure IoT Hub and an IoT device in the Azure portal here: https://aka.ms/AzurePortalHome.
 72  # Instructions to create an IoT Hub and device are here: https://aka.ms/CreateIoTHub
 73  #
 74  # The free tier of IoT Hub allows up to 8,000 messages a day, so try not to send messages too often
 75  # if you are using the free tier
 76  #
 77  # Once you have a hub and a device, copy the device primary connection string.
 78  # Add it to the secrets.py file in an entry called device_connection_string
 79  #
 80  # To us twins, you will need either a free or standard tier IoT Hub. Basic tier doesn't
 81  # support twins
 82  #
 83  # The adafruit-circuitpython-azureiot library depends on the following libraries:
 84  #
 85  # From the Adafruit CircuitPython Bundle (https://github.com/adafruit/Adafruit_CircuitPython_Bundle):
 86  # * adafruit-circuitpython-minimqtt
 87  # * adafruit-circuitpython-requests
 88  from adafruit_azureiot import IoTHubDevice
 89  
 90  # Create an IoT Hub device client and connect
 91  device = IoTHubDevice(socket, esp, secrets["device_connection_string"])
 92  
 93  # Subscribe to device twin desired property updates
 94  # To see these changes, update the desired properties for the device either in code
 95  # or in the Azure portal by selecting the device in the IoT Hub blade, selecting
 96  # Device Twin then adding or amending an entry in the 'desired' section
 97  def device_twin_desired_updated(desired_property_name: str, desired_property_value, desired_version: int):
 98      print("Property", desired_property_name, "updated to", str(desired_property_value), "version", desired_version)
 99  
100  
101  # Subscribe to the device twin desired property updated event
102  device.on_device_twin_desired_updated = device_twin_desired_updated
103  
104  print("Connecting to Azure IoT Hub...")
105  
106  # Connect to IoT Central
107  device.connect()
108  
109  print("Connected to Azure IoT Hub!")
110  
111  message_counter = 60
112  
113  while True:
114      try:
115          if message_counter >= 60:
116              # Send a reported property twin update every minute
117              # You can see these in the portal by selecting the device in the IoT Hub blade, selecting
118              # Device Twin then looking for the updates in the 'reported' section
119              patch = {"Temperature": random.randint(0, 50)}
120              device.update_twin(patch)
121              message_counter = 0
122          else:
123              message_counter = message_counter + 1
124  
125          # Poll every second for messages from the cloud
126          device.loop()
127      except (ValueError, RuntimeError) as e:
128          print("Connection error, reconnecting\n", str(e))
129          # If we lose connectivity, reset the wifi and reconnect
130          wifi.reset()
131          wifi.connect()
132          device.reconnect()
133          continue
134  
135      time.sleep(1)