A short version history listing key milestones over the years:
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May 2018 - Version 0.1.0 - The first public prototype. Built only for the ESP8266. This version only had a very simple telnet interface. The repo had 4 .cpp files and was called Boiler
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September 2018 - Version 1.0.0 - First official stable release on GitHub
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December 2018 - Version 1.1.0 - Added the RC30 and RC35 thermostats
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January 2019 - Version 1.3.0 - Added more boilers and thermostats, and EMS+ support
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February 2019 - Version 1.4.0 - Added dallas sensors. Renamed project from EMS-ESP-Boiler to just EMS-ESP
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March 2019 - Version 1.5.0 - Added support for the ESP32. Only way to change settings was via Telnet.
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March 2019 - Version 1.6.0 - Added Solar module support
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May 2019 - Version 1.7.0 - Added HT3 support and to handle multiple thermostats
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June 2019 - Version 1.8.0 - Added Mixer module, Heat pumps and improved UART logic
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September 2019 - Version 1.9.0 - Major release with a new WebUI based on javascript
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April 2020 - Version 1.9.5 - Big update with more solar, mixer support and writing to HT3
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August 2020 - Version 2.0.0 - Complete re-write of the Telnet Console and WebUI. Added HA support plus an additional 50 new EMS devices
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November 2020 - Version 2.1.0 - More console commands and Web additions
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December 2020 - Version 2.2.0 - added RESTful API, SysLog
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March 2021 - Version 2.2.1 - the last version 2 for the ESP8266
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March 2021 - Version 3.0.0 - exclusive to the ESP32. Ethernet support, improved MQTT
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May 2021 - Version 3.1.0 - write to device from WebUI
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August 2021 - Version 3.2.0 - IPv6 support, System Log in WebUI, more features
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November 2021 - Version 3.3.0 - More devices, pool data, mDNS
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January 2022 - Version 3.4.0 - New UI and more features