get mqtt working with bem 280 sensor

CIRCUITPY/code.py

@@ -1,23 +1,20 @@
+import os
 import board
 import time
 import busio
 from adafruit_bme280 import basic as adafruit_bme280
 
-# i2c = busio.I2C(scl=board.GP15, sda=board.GP14)
-# bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c, 0x76)
-# location's pressure (hPa) QNH at sea level
-# bme280.sea_level_pressure = 1016 # value from https://metar-taf.com/EDDM
 
-# while True:
-    # print("\nTemperature: %0.1f C" % bme280.temperature)
-    # print("Humidity: %0.1f %%" % bme280.relative_humidity)
-    # print("Pressure: %0.1f hPa" % bme280.pressure)
-    # print("Altitude = %0.2f meters" % bme280.altitude)
-    # time.sleep(5)
+i2c = busio.I2C(scl=board.GP15, sda=board.GP14)
+bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c, 0x76)
+# location's pressure (hPa) QNH at sea level
+bme280.sea_level_pressure = 1016 # value from https://metar-taf.com/EDDM
+
 
 from digitalio import DigitalInOut
 import adafruit_esp32spi.adafruit_esp32spi_socket as socket
 from adafruit_esp32spi import adafruit_esp32spi
+import adafruit_minimqtt.adafruit_minimqtt as MQTT
 
 esp32_cs = DigitalInOut(board.GP21)
 esp32_ready = DigitalInOut(board.GP22)
@@ -34,8 +31,114 @@ print("MAC addr:", [hex(i) for i in esp.MAC_address])
 for ap in esp.scan_networks():
     print("\t%s\t\tRSSI: %d" % (str(ap['ssid'], 'utf-8'), ap['rssi']))
 
+print("Connecting to AP...")
+while not esp.is_connected:
+    try:
+        esp.connect_AP(
+            os.getenv("WIFI_SSID"), os.getenv("WIFI_PASSWORD")
+        )
+    except RuntimeError as e:
+        print("could not connect to AP, retrying: ", e)
+        continue
+print("Connected to", str(esp.ssid, "utf-8"), "\tRSSI:", esp.rssi)
 
-# os.getenv("WIFI_PASSWORD")
-# WIFI_SSID
-# WIFI_PASSWORD
+# MQTT inspiration from https://docs.circuitpython.org/projects/minimqtt/en/latest/examples.html
+mqtt_state_topic = "homeassistant/sensor/balcony_weather_station/bme_280_001/state"
+mqtt_config_topic_temperature = "homeassistant/sensor/balcony_weather_station/bme_280_001_temp/config"
+mqtt_config_topic_humidity    = "homeassistant/sensor/balcony_weather_station/bme_280_001_humi/config"
+mqtt_config_topic_pressure    = "homeassistant/sensor/balcony_weather_station/bme_280_001_pres/config"
+
+def connect(mqtt_client, userdata, flags, rc):
+    print("Connected to MQTT Broker!")
+    print("Flags: {0}\n RC: {1}".format(flags, rc))
+
+def disconnect(mqtt_client, userdata, rc):
+    print("Disconnected from MQTT Broker!")
+
+def subscribe(mqtt_client, userdata, topic, granted_qos):
+    print("Subscribed to {0} with QOS level {1}".format(topic, granted_qos))
+
+def unsubscribe(mqtt_client, userdata, topic, pid):
+    print("Unsubscribed from {0} with PID {1}".format(topic, pid))
+
+def publish(mqtt_client, userdata, topic, pid):
+    print("Published to {0} with PID {1}".format(topic, pid))
+
+def message(client, topic, message):
+    print("New message on topic {0}: {1}".format(topic, message))
+
+socket.set_interface(esp)
+MQTT.set_socket(socket, esp)
+mqtt_client = MQTT.MQTT(
+    broker=os.getenv("MQTT_HOST"),
+    username=os.getenv("MQTT_USER"),
+    password=os.getenv("MQTT_PASSWORD"),
+)
+
+mqtt_client.on_connect = connect
+mqtt_client.on_disconnect = disconnect
+mqtt_client.on_subscribe = subscribe
+mqtt_client.on_unsubscribe = unsubscribe
+mqtt_client.on_publish = publish
+mqtt_client.on_message = message
+
+print("Attempting to connect to %s" % mqtt_client.broker)
+mqtt_client.connect()
+
+print("Publishing to %s" % mqtt_config_topic_temperature)
+config_msg_temperature = """{
+  "name": "BEM 280 Temperature",
+  "device_class": "temperature",
+  "unit_of_measurement": "°C",
+  "value_template": "{{ value_json.temperature}}",
+  "state_topic": "homeassistant/sensor/balcony_weather_station/bme_280_001/state",
+  "unique_id": "balcony_weather_station_bme_280_001_temperature",
+  "device": {
+    "identifiers": "balcony_weather_station_001",
+    "name": "Balcony Weather Station"
+  }
+}"""
+mqtt_client.publish(mqtt_config_topic_temperature, config_msg_temperature)
+
+print("Publishing to %s" % mqtt_config_topic_humidity)
+config_msg_humidity = """{
+  "name": "BEM 280 Humidity",
+  "device_class": "humidity",
+  "unit_of_measurement": "%",
+  "value_template": "{{ value_json.humidity}}",
+  "state_topic": "homeassistant/sensor/balcony_weather_station/bme_280_001/state",
+  "unique_id": "balcony_weather_station_bme_280_001_humidity",
+  "device": {
+    "identifiers": "balcony_weather_station_001",
+    "name": "Balcony Weather Station"
+  }
+}"""
+mqtt_client.publish(mqtt_config_topic_humidity, config_msg_humidity)
+
+print("Publishing to %s" % mqtt_config_topic_pressure)
+config_msg_pressure = """{
+  "name": "BEM 280 Pressure",
+  "device_class": "pressure",
+  "unit_of_measurement": "hPa",
+  "value_template": "{{ value_json.pressure}}",
+  "state_topic": "homeassistant/sensor/balcony_weather_station/bme_280_001/state",
+  "unique_id": "balcony_weather_station_bme_280_001_pressure",
+  "device": {
+    "identifiers": "balcony_weather_station_001",
+    "name": "Balcony Weather Station"
+  }
+}"""
+mqtt_client.publish(mqtt_config_topic_pressure, config_msg_pressure)
+
+while True:
+    msg = f"""{{
+        "temperature": {bme280.temperature:.1f},
+        "humidity": {bme280.relative_humidity:.1f},
+        "pressure": {bme280.pressure:.1f}
+    }}"""
+    mqtt_client.publish(mqtt_state_topic, msg)
+    time.sleep(30)
+
+print("Disconnecting from %s" % mqtt_client.broker)
+mqtt_client.disconnect()
 print("Done!")

notes.txt

@@ -0,0 +1,41 @@
+
+## Helpful links
+- https://docs.circuitpython.org/projects/minimqtt/en/latest/examples.html
+- [how to use settings.toml](https://learn.adafruit.com/circuitpython-octoprint-controller-and-monitor/create-your-settings-toml-file)
+- [adafruit-circuitpython-esp32spi docs](https://docs.circuitpython.org/projects/esp32spi/en/latest/)
+- [pico pinout](https://pico.pinout.xyz/)
+- [home assistant mqtt guide](https://www.home-assistant.io/integrations/mqtt/#testing-your-setup)
+- [home assistant device classes](https://www.home-assistant.io/integrations/sensor/#device-class)
+
+## Home assistant debugging
+
+homeassistant/sensor/balcony_weather_station/test_bme_280
+homeassistant/sensor/balcony_weather_station/test_bme_280
+{
+  "name": "BEM 280 Temperature",
+  "device_class": "temperature",
+  "unit_of_measurement": "°C",
+  "value_template": "{{ value_json.temperature}}",
+  "state_topic": "homeassistant/sensor/balcony_weather_station/test_bme_280/state",
+  "unique_id": "balcony_weather_station_bme_280_test_temperature",
+  "device": {
+    "identifiers": "balcony_weather_station_001",
+    "name": "Balcony Weather Station"
+  }
+}
+
+homeassistant/sensor/balcony_weather_station/test_bme_280/state
+{ "temperature": 23.20, "humidity": 50 }
+
+{
+  "name": "BEM 280 Humidity",
+  "device_class": "humidity",
+  "unit_of_measurement": "%",
+  "value_template": "{{ value_json.humidity}}",
+  "state_topic": "homeassistant/sensor/balcony_weather_station/test_bme_280/state",
+  "unique_id": "balcony_weather_station_bme_280_test_humidity",
+  "device": {
+    "identifiers": "balcony_weather_station_001",
+    "name": "Balcony Weather Station"
+  }
+}