update firmware for esp32/esp8266 via http. It means;
- esp using http to download firmware to sdcard.
- after that flashing firmware from sdcard to esp.
The example using libraries that are available on iotsharing.com. They are: http://www.iotsharing.com/2017/05/how-to-use-arduino-esp32-to-store-data-to-sdcard.html
File fotacontrol.py is used to test example 2. It used paho mqtt https://pypi.python.org/pypi/paho-mqtt/1.1.