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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.
With an inductive load and 20A rating, most consumer grade smart devices won't cut it here. Suraielec and Dewenwils have some WiFi options, and can be flashed to ESPHome or Tasmota if you don't want your irrigation system dependent on a cloud connection. Using one of those options, once you load your schedule, it's saved on the device itself, so even if it loses WiFi connectivity, it will still run the schedule.