https://docs.espressif.com/projects/esp-idf/en/latest/
https://www.espressif.com/en/support/download/documents
https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf
https://www.electrodragon.com/w/images/3/36/14th_June_2017_Espressif_Company_Brochure_EN.pdf
https://empa.com/dokumanlar/iotevent/empa-espressif.pdf
http://www.i-element.org/PDF/E09.pdf
https://www.handsontec.com/pdf_learn/ESP8266_ESP32-oct2016.pdf
https://www.robolinkmarket.com/datasheet/kolban-ESP32.pdf
https://cdn.sos.sk/productdata/05/82/cd413a9e/esp32-devkitc.pdf
https://upcommons.upc.edu/bitstream/handle/2117/118541/report-tfm-eduard-valentino.pdf
https://www.diyiot.nl/download/IOT_Book_Part_2.pdf
https://core.ac.uk/download/pdf/87654922.pdf
https://glyndwr.collections.crest.ac.uk/17286/1/MSV%20%20ITA-17%20rev_inc%20c%20sheet.pdf
http://ena.lp.edu.ua:8080/bitstream/ntb/40455/2/2017_Lykhotop_D-Mobile_LAN_based_on_BLE_434-436.pdf