get mqtt working with bem 280 sensor

notes.txt

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+
+## 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"
+  }
+}