I have spent an hour searching for a satisfying answer but I could not find what I was looking for.
I have to built a the following network for my school project:
-> 1 x ESP32 (master)
-> 3 x ESP32 (slaves)
-> 1 x RasPi with LTE-Stick (internet connection)
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The aim is to enable the master-esp32 to gather data from the slaves and send the data periodically to a server on the internet using the raspi's AP. Is it possible that the master ESP32 serves as an AP to its slaves and simultaniously connects to the RasPI's AP in order to get the internet connection?
Only the master-device need to be connected to the internet over LTE. The slaves have to transmit small pieces of data to the master periodically. Unfortunately, I have read a lot of discussions that say using BLE and WiFi at the same time is very complicated and unstable. So, I am seeking for a simple and robust solution.
If I cannot find any satisfying solution with ESP32, I will ask my supervisor to allow me to use "AVR+nrf24" for the slaves and "RasPi+nrf24+LET-Stick" for the Master. That way, I would easily solve the problem, but he wants me to use minimal HW-diversity and prefers the ESP32-network, if possible. In future, CAN-bus connectivity will be needed for this network, so the ESP32 would be the cleaner solution, since it has a builtin CAN-controller.
Thank you in advance.
Cengo