This PR calls `esp_wifi_set_storage(WIFI_STORAGE_RAM);` when
  persistent WiFi configuration is not desired.

The wifi stack initialisation must be complete before calling  `_udp_ota.parsePacket()` otherwise you just get a screen filled with 
```
```
and due to the more async methods in ESP32 `handle()` may be called before this can occur.

If you develop on windows and need cr/lf files, see this:

    https://git-scm.com/book/en/v2/Customizing-Git-Git-Configuration#_formatting_and_whitespace

    Git can handle this by auto-converting CRLF line endings into LF
    when you add a file to the index, and vice versa when it checks out
    code onto your filesystem. You can turn on this functionality with
    the core.autocrlf setting. If you're on a Windows machine, set it
    to true - this converts LF endings into CRLF when you check out code:

    $ git config --global core.autocrlf true

Changed Flashmode to DIO due board only supports DIO

with minimal SPIFFS partition size and OTA support for bigger apps

* Update BLE lib

* Update IDF to f586f5e

* Restructure Bluetooth Serial includes

* Update esptool and gen_esp32part

* Add partition scheme selection for menuconfig

* Add partition scheme selection for Arduino IDE

* Fix BLE example

* Second attempt BLE fix

* Add exceptions to PIO

This change uses the `_RST` bit of the i2c peripheral to force the hardware into power on reset state.  The prior code assumed the peripheral was already in a reset, it just cleared the reset bit.  

Chuck.

* Update WiFiMulti.cpp

added 5 sec timeout from ESP8266

* Update WiFiMulti.cpp

* Update WiFiMulti.h

Should we add this declaration option for all boards?

* HardwareSerial - availableForWrite() support

* fix indentation errors (tab vs space)

This code allows Wire.begin() to assign the default values of SDA, and SCL only if they have not been previously configured.  Arduino libraries that use Wire() usually re-init the I2C interface in their initialization code with a call to Wire.begin().  If a user app sets custom pins assignment in setup(); These assignments will be overwritten with the default values  whenever Wire.begin() is called.

M5Stack variant (pins_arduino.h) file is not automatically included,
because boards.txt m5stack-core-esp32.build.variant=esp32
This commit changes m5stack-core-esp32.build.variant from esp32 to m5stack_core_esp32
also rename M5Stack variant directory from m5stack-core-esp32 to m5stack_core_esp32

* Add hasClient for BluetoothSerial

* Add SPP_TAG

The Arduino IDE currently requires the use of a tab separator between the name and identifier. Without this tab the keyword is not highlighted.

Reference:
https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification#keywords

* Add BluetoothSerial library

A simple UART to Classical Bluetooth bridge for ESP32

* Create README.md

* Fix typos

* Replace deprecated header and small fixes

* Add coexistence with BLE

* Add missing semicolon

* Add access to last write date time

add example

* rename cpp to ino orz

* wrong copy -past

* No comment orz

* Add missing space

The cycle count that micros() is using to report timing is a PER Task value.  When micros() or delayMicroseconds() is called from different Tasks, the lastCycleCount value may have no relationship to the current Task specific cycleCount. If the current cycleCount is less than the saved lastCycleCount a rollover condition is assumed. This erroneous conditions results in incorrect delays and reported microseconds.  This fix creates thread local storage so that each Task will have accurate microsecond reporting and delays.  The reported microseconds are not real time, they are microseconds of the current Task execution.

* Updated to download mkspiffs 0.2.2

* Updated to have proper hashes and sizes. Also updated to new windows file name

off by one

Update test to show more detail to help for checking for poor/inconsistent FLASH operation.

Fixes #1094

flush tcp buffer instead of reading it byte by byte.

The ESP8266 version of the mDNS library expected service name and protocol without leading '_' (underscore). The ESP32 version expected service name and protocol with leading '_' (underscore).
This small change makes the ESP32 version compatible with the ESP8266 version and keeps backward compatible with existing code by accepting service name and protocol either with or without leading '_' (underscore).

See  https://stackoverflow.com/questions/6812031/how-to-make-unicode-string-with-python3

May unicode an alias for str()

esp_efuse_mac_get_default() only stores into the bottom 6 bytes of it's 8-byte argument, so must initialize this arg to zero to avoid trash on the stack.

* Add Ticker library

* Fix CI (#1)

remove LED_BUILTIN in examples