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Tasmota
Alternative firmware for ESP8266 and ESP32 based devices with easy configuration using webUI, OTA updates, automation using timers or rules, expandability and entirely local control over MQTT, HTTP, Serial or KNX. Full documentation at
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Btw smart life and tuya smart are the same app I believe, both connect to tuya products, tuya products are shipped around the world under different brand names but are ultimately all tuya, a lot of tuya products are based on the ESP series of microcontrollers, which are usually easy to flash with your own firmware to gain local control over MQTT. Look into tasmota or esphome, tasmota is my personal favourite: https://tasmota.github.io/docs/
They are newer, yes. But other than that, The Conbee can have 512 devices (changed in 2.14.4: https://github.com/dresden-elektronik/deconz-rest-plugin/releases/tag/v2.12.4-beta) opposed to the sonoff : https://notenoughtech.com/home-automation/sonoff-zigbee-3-0-usb-dongle-plus/ which seems to have a 200 device limit.