update client and socket.c, add DNS support

GuoWenxue

2022-04-19 ea435789dc2fab30ec16fa765a0b6577fe08166a

 mqttd/etc/conf.c

@@ -182,6 +182,9 @@

        ctx->hwconf.light_intval = iniparser_getint(ini, "hardware:light_intval", 20);
        log_nrml("Parser inbreak fill-in light interval time [%d]\n", ctx->hwconf.light_intval);

        ctx->hwconf.lux_threshold = iniparser_getdouble(ini, "hardware:lux_threshold", 0.1);
        log_nrml("Parser fill-in light threshold lux [%.03f]\n", ctx->hwconf.lux_threshold);
    }