/******************************************************************************
* libwebsockets 运行问题
* 说明：
* 编译发现libwebsockets运行出问题，解决一下。
*
* 2017-6-28 深圳 龙华樟坑村 曾剑锋
*****************************************************************************/
一、错误现象：
1. Run error message:
[zengjf@root ~]# ./lwsserver
Parse local config over, member size: 8
[2017/03/16 18:35:09:7201] NOTICE: Initial logging level 7
[2017/03/16 18:35:09:7202] NOTICE: Libwebsockets version: 1.7.5 zengjf@zengjf-
[2017/03/16 18:35:09:7202] NOTICE: IPV6 not compiled in
[2017/03/16 18:35:09:7203] NOTICE: libev support not compiled in
[2017/03/16 18:35:09:7205] NOTICE: Threads: 1 each 1024 fds
[2017/03/16 18:35:09:7205] NOTICE: mem: platform fd map: 4096 bytes
[2017/03/16 18:35:09:7206] NOTICE: mem: per-conn: 308 bytes + protocol rx buf
[2017/03/16 18:35:09:7207] NOTICE: canonical_hostname = zengjf
[2017/03/16 18:35:09:7207] NOTICE: Compiled with OpenSSL support
[2017/03/16 18:35:09:7208] NOTICE: Using non-SSL mode
[2017/03/16 18:35:09:7309] NOTICE: OpenSSL doesn't support ECDH
[2017/03/16 18:35:09:7311] NOTICE: Listening on port 9000
starting server with thread: 1...
2. Browser error message:
VM900:37 WebSocket connection to 'ws://localhost:9000/' failed: Error in connection establishment: net::ERR_CONNECTION_REFUSED
二、解决办法：
1. cat package/libwebsockets/libwebsockets.mk
...
LIBWEBSOCKETS_CONF_OPTS = -DLWS_WITHOUT_TESTAPPS=ON -DLWS_IPV6=OFF -DLWS_SSL_SERVER_WITH_ECDH_CERT=ON
...
2. cat output/build/libwebsockets-v1.7.5/CMakeLists.txt
...
if (LWS_SSL_SERVER_WITH_ECDH_CERT)
set(LWS_SSL_SERVER_WITH_ECDH_CERT 1)
endif()
...
3. cat output/build/libwebsockets-v1.7.5/lws_config.h
...
/* Build with support for ipv6 */
#undef LWS_USE_IPV6
...
/* SSL server using ECDH certificate */
#define LWS_SSL_SERVER_WITH_ECDH_CERT
...
