Alen BreatheSmart air purifier sensor readings

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Some research and hacking this morning has allowed me to create a script to read sensor values from an Alen BreatheSmart air purifier and publish them for HA via MQTT. These purifiers are based on the Tuya IoT platform and publish a reading for air quality (PM2.5 in micrograms per cubic meter), its fan speed, and its remaining sensor life along with some less-interesting data.

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