noPoll

noPoll is a OpenSource WebSocket implementation (RFC 6455) , written in ansi C , that allows building pure WebSocket solutions or to provide WebSocket support to existing TCP oriented applications.

Here is a simple implementation for RT-Thread based on noPoll , temporarily only support non-encrypted operation.

Quick Start

There is a websocket client example at examples/nopoll_client.c.
Test server host : echo.websocket.org
Test server port : 80

Run the example at MSH as follows :

msh />nopoll_client
web socket connection ready!
sending content..
recv: Hello RT-Thread!
sendcnt = 1
...
...

Notes

1 Not defined strdup function

If your compiler is not offered strdup function , you can implement it yourself as shown below :

/* _strdup.c  */   
#include <rtthread.h>

#ifdef RT_USING_HEAP
char *strdup(const char *s)
{
	size_t len = strlen(s) + 1;
	char *tmp = (char *)rt_malloc(len);

	if(!tmp) return NULL;

	rt_memcpy(tmp, s, len);
	return tmp;
}
#endif

2 FD_SETSIZE too small

Please config the project as shown below :
The RT-Thread Component/Device virtual file system/The maximal number of opened files value need to greater or equal to RT-Thread Component/Network stack/light weight TCP/IP stack/The number of raw connection value.

Reference

1 WebSocket Official website : http://websocket.org/
2 noPoll Official website : http://www.aspl.es/nopoll/
3 noPoll GitHub repository : https://github.com/ASPLes/nopoll
4 WebSocket test server : http://websocket.org/echo.html