We deliver free in all of EU using our standard courrier, which takes 14-18 days.
In Spain we can also do express delivery for most products in 2-3 days.
No we do not sell Sonoff products with the EweLink software.
ESPurna ("spark" in Catalan) is a custom firmware for ESP8285/ESP8266 based smart switches, lights and sensors.
It supports a number of SONOFF devices and feaures e.g. mqtt and Home Assistant integration.
You may find more information on github.
It provides local control, new features and easy integration with home automation systems.
You may find more information on github
On delivery it is already in factory reset state.
If you want to factory reset afterwords, check this link Tasmota Button Usage
When held continuously for 40 seconds (Configurable with SetOption32, value is 10x the configured hold time) Tasmota will reset to firmware defaults and restart.