Due to the incompatibility of the new BLYNK application and the high price of a new subscription to Blynk services, Nautilis devices will no longer support Blynk. Blynk Legacy will be removed from all devices in future firmware updates. MQTT support was added instead.
iRelay changes are related to improved usage on iOS devices. The option to change the SSID and password has been added on all versions of the thermometer. High and low temperature alarm for SHT version, interval to send every 60 minutes & support for SENSOR SPY application is novelty.
Only system changes have been made to the iRelay classic firmware. iRelay Light now has the ability to DIY & make and convert to a temperature controller. In the management menu it is possible to switch on / off a special relay switch for heating and a special relay switch for cooling. To upgrade to a controller you need a relay module like this one. The default state is off. Only system changes were made on the thermometer. Firmware site
The new upgrade allows you to convert a classic OLED thermometer into a WiFi temperature controller like the V4. In particular, you can control the heating and cooling relay. The initial state of these relays is switched off. To upgrade to a controller you need a relay module like this one.
In version 6.1.1, the ability to connect SHT sensors for temperature and humidity has been added. Possibilities still need to be considered for this option. In version 6.1.2, the ability to send data to Ubidots has been added. Firmware for both versions of the thermometer can be downloaded here.
Thermometer data is here.