Adds mqtt example (#68)

Adds mqtt example by @robmarkcole - see also: https://github.com/robmarkcole/rpi-enviro-mqtt

Author: robmarkcole

examples/mqtt-all.py

@@ -0,0 +1,212 @@
+"""
+Run mqtt broker on localhost: sudo apt-get install mosquitto mosquitto-clients
+
+Example run: python3 mqtt-all.py --broker 192.168.1.164 --topic enviro
+"""
+#!/usr/bin/env python3
+
+import argparse
+import ST7735
+import time
+from bme280 import BME280
+from pms5003 import PMS5003, ReadTimeoutError
+from enviroplus import gas
+
+try:
+    # Transitional fix for breaking change in LTR559
+    from ltr559 import LTR559
+
+    ltr559 = LTR559()
+except ImportError:
+    import ltr559
+
+from subprocess import PIPE, Popen, check_output
+from PIL import Image, ImageDraw, ImageFont
+from fonts.ttf import RobotoMedium as UserFont
+import json
+
+import paho.mqtt.client as mqtt
+import paho.mqtt.publish as publish
+
+try:
+    from smbus2 import SMBus
+except ImportError:
+    from smbus import SMBus
+
+
+DEFAULT_MQTT_BROKER_IP = "localhost"
+DEFAULT_MQTT_BROKER_PORT = 1883
+DEFAULT_MQTT_TOPIC = "enviroplus"
+
+# mqtt callbacks
+def on_connect(client, userdata, flags, rc):
+    print(f"CONNACK received with code {rc}")
+    if rc == 0:
+        print("connected OK")
+    else:
+        print("Bad connection Returned code=", rc)
+
+
+def on_publish(client, userdata, mid):
+    print("mid: " + str(mid))
+
+
+# Read values from BME280 and PMS5003 and return as dict
+def read_values(bme280, pms5003):
+    # Compensation factor for temperature
+    comp_factor = 2.25
+
+    values = {}
+    cpu_temp = get_cpu_temperature()
+    raw_temp = bme280.get_temperature()  # float
+    comp_temp = raw_temp - ((cpu_temp - raw_temp) / comp_factor)
+    values["temperature"] = int(comp_temp)
+    values["pressure"] = round(
+        int(bme280.get_pressure() * 100), -1
+    )  # round to nearest 10
+    values["humidity"] = int(bme280.get_humidity())
+    try:
+        pm_values = pms5003.read()  # int
+        values["pm1"] = pm_values.pm_ug_per_m3(1)
+        values["pm25"] = pm_values.pm_ug_per_m3(2.5)
+        values["pm10"] = pm_values.pm_ug_per_m3(10)
+    except ReadTimeoutError:
+        pms5003.reset()
+        pm_values = pms5003.read()
+        values["pm1"] = pm_values.pm_ug_per_m3(1)
+        values["pm25"] = pm_values.pm_ug_per_m3(2.5)
+        values["pm10"] = pm_values.pm_ug_per_m3(10)
+    data = gas.read_all()
+    values["oxidised"] = int(data.oxidising / 1000)
+    values["reduced"] = int(data.reducing / 1000)
+    values["nh3"] = int(data.nh3 / 1000)
+    values["lux"] = int(ltr559.get_lux())
+    return values
+
+
+# Get CPU temperature to use for compensation
+def get_cpu_temperature():
+    process = Popen(["vcgencmd", "measure_temp"], stdout=PIPE, universal_newlines=True)
+    output, _error = process.communicate()
+    return float(output[output.index("=") + 1 : output.rindex("'")])
+
+
+# Get Raspberry Pi serial number to use as ID
+def get_serial_number():
+    with open("/proc/cpuinfo", "r") as f:
+        for line in f:
+            if line[0:6] == "Serial":
+                return line.split(":")[1].strip()
+
+
+# Check for Wi-Fi connection
+def check_wifi():
+    if check_output(["hostname", "-I"]):
+        return True
+    else:
+        return False
+
+
+# Display Raspberry Pi serial and Wi-Fi status on LCD
+def display_status(disp, mqtt_broker):
+    # Width and height to calculate text position
+    WIDTH = disp.width
+    HEIGHT = disp.height
+    # Text settings
+    font_size = 16
+    font = ImageFont.truetype(UserFont, font_size)
+
+    wifi_status = "connected" if check_wifi() else "disconnected"
+    text_colour = (255, 255, 255)
+    back_colour = (0, 170, 170) if check_wifi() else (85, 15, 15)
+    id = get_serial_number()
+    message = "{}\nWi-Fi: {}\nmqtt-broker: {}".format(id, wifi_status, mqtt_broker)
+    img = Image.new("RGB", (WIDTH, HEIGHT), color=(0, 0, 0))
+    draw = ImageDraw.Draw(img)
+    size_x, size_y = draw.textsize(message, font)
+    x = (WIDTH - size_x) / 2
+    y = (HEIGHT / 2) - (size_y / 2)
+    draw.rectangle((0, 0, 160, 80), back_colour)
+    draw.text((x, y), message, font=font, fill=text_colour)
+    disp.display(img)
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Publish enviroplus values over mqtt")
+    parser.add_argument(
+        "--broker", default=DEFAULT_MQTT_BROKER_IP, type=str, help="mqtt broker IP",
+    )
+    parser.add_argument(
+        "--port", default=DEFAULT_MQTT_BROKER_PORT, type=int, help="mqtt broker port",
+    )
+    parser.add_argument(
+        "--topic", default=DEFAULT_MQTT_TOPIC, type=str, help="mqtt topic"
+    )
+    args = parser.parse_args()
+
+    print(
+        """mqtt-all.py - Reads temperature, pressure, humidity,
+    PM2.5, and PM10 from Enviro plus and sends data over mqtt.
+
+    broker: {}
+    port: {}
+    topic: {}
+
+    Press Ctrl+C to exit!
+
+    """.format(
+            args.broker, args.port, args.topic
+        )
+    )
+
+    mqtt_client = mqtt.Client()
+    mqtt_client.on_connect = on_connect
+    mqtt_client.on_publish = on_publish
+    mqtt_client.connect(args.broker, port=args.port)
+
+    bus = SMBus(1)
+
+    # Create BME280 instance
+    bme280 = BME280(i2c_dev=bus)
+
+    # Create LCD instance
+    disp = ST7735.ST7735(
+        port=0, cs=1, dc=9, backlight=12, rotation=270, spi_speed_hz=10000000
+    )
+
+    # Initialize display
+    disp.begin()
+
+    # Create PMS5003 instance
+    pms5003 = PMS5003()
+
+    # Raspberry Pi ID
+    device_serial_number = get_serial_number()
+    id = "raspi-" + device_serial_number
+
+    # Display Raspberry Pi serial and Wi-Fi status
+    print("Raspberry Pi serial: {}".format(get_serial_number()))
+    print("Wi-Fi: {}\n".format("connected" if check_wifi() else "disconnected"))
+    print("MQTT broker IP: {}".format(args.broker))
+
+    time_since_update = 0
+    update_time = time.time()
+
+    # Main loop to read data, display, and send over mqtt
+    mqtt_client.loop_start()
+    while True:
+        try:
+            time_since_update = time.time() - update_time
+            values = read_values(bme280, pms5003)
+            values["serial"] = device_serial_number
+            print(values)
+            mqtt_client.publish(args.topic, json.dumps(values))
+            if time_since_update > 145:
+                update_time = time.time()
+            display_status(disp, args.broker)
+        except Exception as e:
+            print(e)
+
+
+if __name__ == "__main__":
+    main()

library/setup.cfg

@@ -38,6 +38,7 @@ install_requires =
 	astral
 	pytz
 	sounddevice
+	paho-mqtt
 
 [flake8]
 exclude =