Thanks to everyone involved.

New features

• BREAKING - require Arduino for ESP8266 >= 2.2.0: mDNS querying available instead of having to explicitely specify MQTT / OTA servers host / port (#28)
• Add error reason to the JSON configuration API response

Fixes

• The MQTT connection fail reason was always UNKNOWN, this is fixed
• Fix an issue with the configuration API, happening most often in the new 2.2.0 release of Arduino for ESP8266 (#69)

Web UI

The v1.x.x Web setup is not hosted anymore. You can download it as homie-esp8266-v1-setup.zip below.