* Remove duplicated include

* Clear certificates just after handshake

It can save up to 7k of heap

Method:
--------
Added a verbose print method for ease.

Test Case:
-----------
Putting ESP32 to sleep will give a different reason on wake than the first
time power up.

* Update esp32-hal-uart.c

* Two Stop Bit Workaround

see https://github.com/espressif/esp-idf/blob/master/components/driver/uart.c  lines 118-127

* Create hall_effect_esp32.ino

A simple example to access the hall effect sensor in the esp32

* Create hall_effect.ino

* Update hall_effect.ino

Simple sketch to access the internal hall effect detector on the esp32

* Delete hall_effect_esp32.ino

* Create HallSensor.ino

* Update HallSensor.ino

* Update HallSensor.ino

* Delete hall_effect.ino

Connected to: https://github.com/espressif/arduino-esp32/issues/400

Required for WebServer and/or DNSServer libraries

Implement methods from ESP8266WiFiClient but use sockets API.

* Update WiFiAP.cpp

set from code the maximum number of clients to smaller than 4 (in my case i must allow only one client at a time)

* Update WiFiAP.h

* Update WiFiAP.cpp

* Update WiFiAP.cpp

* Create WiFiAP.cpp

* added OTA Update S3 example with a sample bin

* Update as per comments

This reverts commit 63e1daa5ea67ce0f9b89b789e4bb26672f64d32e.

Update boards files

- add roll back API to switch the running partition
- do not write the partition magic until the end to prevent booting
into partially written update

Fixes: https://github.com/espressif/arduino-esp32/issues/339

Fixes: https://github.com/espressif/arduino-esp32/issues/400

Fixes: https://github.com/espressif/arduino-esp32/issues/391

WiFiTelnetToSerial is also a test for hasClient().

Fixes: https://github.com/espressif/arduino-esp32/issues/373

This needs proper testing!
Fixes: https://github.com/espressif/arduino-esp32/issues/353

Fixes: https://github.com/espressif/arduino-esp32/issues/384

- call esp_wifi_start()
- separate tcp initialization to prepare for Ethernet
- setup dhcp addresses when using custom IP config for SoftAP

Thanks @miomir1981

* Add setNoDelay and getNoDelay to WiFiServer class

* Remote TCP disconnect not detected

* Fix possible infinite loop in the example

* Remove workaround of sockets always return -76 

Remove workaround of sockets always return -76 (because it's fixed on IDF now)
Remove delay during handshake (improving stability)

* Remove unusable mbedtls_net of context creation

* Fix bad destructor

* Compatibility with WiFiClient for HTTPClient

* Initial port from ESP8266

Changed SHA1 fingerprint by Root CA verification
Changed log system

* Remove deprecated function

Board from AI-Thinker

* add support for widora-air board

* change widora-air f_cpu error,from 400M to 240M