更新feeds
./scripts/feeds update -a
./scripts/feeds install -a
在menuconfig中选择libuwsc，然后重新编译固件。
Libraries --->
Networking --->
<*> libuwsc-mbedtls.................................... libuwsc (mbedtls)
< > libuwsc-nossl....................................... libuwsc (NO SSL)
< > libuwsc-openssl.................................... libuwsc (openssl)
< > libuwsc-wolfssl.................................... libuwsc (wolfssl)