You can convert your device to an obniz by writing an obnizOS and a device key (obnizID) to your ESP32 or a device that is using ESP32.
There is a monthly fee for issuing an ID, depending on the number of devices.( price list )。
Writing of OS and device key (obnizID)
If you don't have a device on hand, you must first select a device and purchase it. The choice is made by selecting the device processor.
Next, you need to issue an obnizID and write it to the device with the OS.
Connect the device to your PC by serial communication and write to the device by using a software called "obniz-cli".