Will this kit be ever available again? Hope espressif will answer.

Hi, has there been any problem with the library installation? This error 'not declared in this scope' occurs when there is an unknown variable. Usually, when the included library is not installed but we try to compile a code, we often see this error.

Not sure about Wrover, but many had the same issue with WROOM. https://github.com/espressif/arduino-esp32/issues/2907 https://esp32.com/viewtopic.php?t=5732 Here is a design using the Weemos version. https://oshwlab.com/Antongsm/esp32-lan8720 Let's see if anyone has succeeded in performing the same ...

I didn't come across any 2-way SPI communication tutorial. It is possible to establish 2-way communication between two ESP-32 modules using ESP-NOW protocol.

https://forum.allaboutcircuits.com/thre ... 32.184799/

Here are some info about this error message: https://github.com/espressif/arduino-esp32/issues/834

Hi, have you followed this document thoroughly?

https://docs.espressif.com/projects/esp ... pplication

These old threads may give you some clues if you already have not checked them:

https://arduino.stackexchange.com/quest ... deep-sleep
https://www.esp8266.com/viewtopic.php?f=13&t=14836

Depending on your application, you can enter power-saving modes of the ESP-32. There are deep sleep, light sleep, hibernation etc.
https://lastminuteengineers.com/esp32-s ... nsumption/

Sorry. Can't understand what is world controller. Would you please eleborate?

Not sure but you may get some idea from this thread: viewtopic.php?t=26616