ESP32 Adruino IDE connecting to HA

we are building a Dosingsystem, we have a ESP32 and a Adruino Mega.
We downloaded a .ino file what we flashed onto the ESP32 with Adruino IDE.
The ESP32 does not show in Home Assistent online, how does it work?
Sry i am new to this.

We have no idea. Ask the developer of the dosing system.

i managed it now, fe flashed te .ino file to the esp32 with adruino IDE and there we set the MQTT Broker, so the ESP32 will communicate with HA with MQTT