MacOSXのArduino IDEにESP32開発環境を追加する方法

M5Stackを買ったので、下記を参考にESP32の開発環境をMacBookAirに入れた。
Arduino core for the ESP32 のインストール方法 | mgo-tec電子工作

M5 Stackのライブラリは、ライブラリマネージャから入れた。

yosukenoMacBook-Air:tools yosukekirihata$ cd /Applications/Arduino.app/Contents/Java/hardware/espressif/esp32/tools/
yosukenoMacBook-Air:tools yosukekirihata$ python get.py
System: Darwin, Info: Darwin-16.7.0-x86_64-i386-64bit
Platform: x86_64-apple-darwin
Downloading xtensa-esp32-elf-osx-1.22.0-80-g6c4433a-5.2.0.tar.gz
Done
Extracting xtensa-esp32-elf-osx-1.22.0-80-g6c4433a-5.2.0.tar.gz
Downloading esptool-da31d9d-macos.tar.gz
Done
Extracting esptool-da31d9d-macos.tar.gz
Downloading mkspiffs-0.2.2-arduino-esp32-osx.tar.gz
Traceback (most recent call last):
  File "get.py", line 148, in <module>
    get_tool(tool)
  File "get.py", line 103, in get_tool
    urlretrieve(url, local_path, report_progress)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 98, in urlretrieve
    return opener.retrieve(url, filename, reporthook, data)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 245, in retrieve
    fp = self.open(url, data)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 213, in open
    return getattr(self, name)(url)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib.py", line 443, in open_https
    h.endheaders(data)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 1049, in endheaders
    self._send_output(message_body)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 893, in _send_output
    self.send(msg)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 855, in send
    self.connect()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/httplib.py", line 1274, in connect
    server_hostname=server_hostname)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py", line 352, in wrap_socket
    _context=self)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py", line 579, in __init__
    self.do_handshake()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ssl.py", line 808, in do_handshake
    self._sslobj.do_handshake()
IOError: [Errno socket error] [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590)
yosukenoMacBook-Air:tools yosukekirihata$

なんかSSLのエラー？が出たが、Arduino IDEを起動すると、ツール→ボード→ESP32 Dev Moduleを選択できるようになった。
M5Stackのサンプルコードをビルドして、書き込み・実行もできた。

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MacOSXのArduino IDEにESP32開発環境を追加する方法