offset is ignored in esp_artnet_neopixel

[robertoostenveld]

As reported in https://robertoostenveld.nl/esp-8266-art-net-neopixel-module/#comment-45018 the offset does not work. Around line https://github.com/robertoostenveld/arduino/blob/080945494c4f9903c10332dbad0eda696e98cef7/esp8266_artnet_neopixel/esp8266_artnet_neopixel.ino#L72 something should be done with it.

[sisensee]

After reading some of the comments I attempted to create a config.json empty file and pushed the whole data folder up. I have verified that the file exists by browsing to /dir but I am unable to save the offset still.