Install :
opkg install libcares_1.14.0-1_mipsel_24kc.ipk
opkg install libev_4.24-1_mipsel_24kc.ipk
opkg install libmbedtls_2.13.0-2_mipsel_24kc.ipk
opkg install libpcre_8.42-1_mipsel_24kc.ipk
opkg install libsodium_1.0.16-1_mipsel_24kc.ipk
opkg install shadowsocks-libev_3.2.3-1_mipsel_24kc.ipk