My plan is:
a) 2 Buzzer devices based on ESP32-Wrover-B microprocessors
b) 1 Android phone with Blynk.app
c) WiFi or BLE or Bluetooth Classic
Objective:
Whatever buzzer is pressed (“buzzed”) first, shall run an automation in the Blynk.app which
(i) switches on the LED in the buzzed-first-device
(ii) blocks trigger events from the buzzed-second-device (and keeps its LED switched-off)
Is this a practical idea, will it work with the “Free” plan, what is the best wireless technology to use?