The old Blynk legacy app has been removed and support for the new Blynk IOT app has been added. It has a web interface as well as support for all mobile devices. The sending interval to that application is 10 seconds, which is the smallest interval of all applications. If you don’t use Blynk, you don’t have to waste time upgrading… Due to weak demand, the Light version will no longer be available… The last device is offered at a special price. It’s Black Friday after all.