Deep-Sleep needs WiFi and Bluetooth switched OFF for low current consumption

rudi48 made some investigations regarding power saving during deep sleep here. Summary: To achieve maximum power saving during deep sleep it is necessary to switch off Bluetooth and WiFi before calling esp_deep_sleep_start(); Example:

 

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ESP32 BLE server

I wanted to try out the BLE capabilities of the ESP32. I will not go into deep explanations how BLE works. Adafruit has a nice tutorial that explains details. To learn about BLE, check out the Introduction to Bluetooth Low Energy. As I have temperature and humidity sensors attached the logical step would be to set it up as an environment sensor. I checked  the Bluetooth GATT services to find out if there is something matching defined. And there is

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