minimqtt_pub_sub_nonblocking_esp32spi.py

# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

import os
import time

import adafruit_connection_manager
import board
import busio
import neopixel
from adafruit_esp32spi import adafruit_esp32spi
from digitalio import DigitalInOut

import adafruit_minimqtt.adafruit_minimqtt as MQTT

# Add settings.toml to your filesystem CIRCUITPY_WIFI_SSID and CIRCUITPY_WIFI_PASSWORD keys
# with your WiFi credentials. Add your Adafruit IO username and key as well.
# DO NOT share that file or commit it into Git or other source control.

aio_username = os.getenv("aio_username")
aio_key = os.getenv("aio_key")

# 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)

### Adafruit IO Setup ###

# Setup a feed named `testfeed` for publishing.
default_topic = aio_username + "/feeds/testfeed"


### Code ###
# Define callback methods which are called when events occur
def connected(client, userdata, flags, rc):
    # This function will be called when the client is connected
    # successfully to the broker.
    print(f"Connected to MQTT broker! Listening for topic changes on {default_topic}")
    # Subscribe to all changes on the default_topic feed.
    client.subscribe(default_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(f"New message on topic {topic}: {message}")


# Connect to WiFi
print("Connecting to WiFi...")
esp.connect_AP(os.getenv("CIRCUITPY_WIFI_SSID"), os.getenv("CIRCUITPY_WIFI_PASSWORD"))
print("Connected!")

pool = adafruit_connection_manager.get_radio_socketpool(esp)
ssl_context = adafruit_connection_manager.get_radio_ssl_context(esp)

# Set up a MiniMQTT Client
mqtt_client = MQTT.MQTT(
    broker="io.adafruit.com",
    username=aio_username,
    password=aio_key,
    socket_pool=pool,
    ssl_context=ssl_context,
)

# 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(f"Sending photocell value: {photocell_val}")
    mqtt_client.publish(default_topic, photocell_val)
    photocell_val += 1
    time.sleep(3)