This is a basic HTTP server with WebSockets for ESP8266 based on httpd from LwIP.
This server was intended to be used with esp-open-rtos, although it should work with non-RTOS version of SDK, since httpd is based on callbacks.
WebSockets implementation supports binary and text modes. Multiple sockets are supported. Continuation frames are not implemented.
Run make html before building the project in order to generate fsdata.c with web contents.
By default, a WebSocket is closed after 20 seconds of inactivity to conserve memory. This behavior can be changed by overriding WS_TIMEOUT option.
To enable debugging extra flags -DLWIP_DEBUG=1 -DHTTPD_DEBUG=LWIP_DBG_ON should be passed at compile-time.
Example code is located inside http_server. It demonstrates streaming ADC reading and server status parameters (screenshot). Web-page contents are located inside fsdata/fs subdirectory. Httpd expects a fsdata.c file, which contains C structures generated from the contents of fs folder. This file is created with makefsdata Perl utility.