Websocket Client for ESP-32

This is a simple library that implements a Websocket client for an ESP-32. This is based off of https://github.com/morrissinger/ESP8266-Websocket with some modifications to support ESP-32 and WiFiClientSecure.

Primary differences from ESP8266-Websocket:

• Removed MD5 library as this is provided by ESP32 core
• Changed WebSocketClient to recognize a common alternate case variant of the "Sec-WebSocket-Accept" header ("Sec-Websocket-Accept").
• Buffers writes to socket (up to 128 bytes) to better support WiFiClientSecure.
• Removed WebSocketServer because there was no goal to implement that here.

Notes / Limitations

• Supports only single frame text frames.
• Max frame size is 65535 characters.
• No support for continuation, binary, or ping/pong.

Credits

Thanks to morrissinger for ESP8266-Websocket, which this library has been forked from to add ESP32 support.

Thanks to brandenhall, for Arduino-Websocket which morrissinger/ESP8266-Websocket was forked from to add ESP8266 support.

Thanks to ejeklint for Arduino-WebsocketServer which brandenhall/Arduino-Websocket was forked from was forked from in order to add non-hixie-76 support.