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
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?