update lightd main.c, add lux sensor support and test ok

guowenxue

2021-01-28 a903b916f09419e7324a2352232e601acc598d67

 apue/2.Socket/socket_client.c

@@ -109,7 +109,8 @@
          }
       }

       //printf("Read %d bytes data from server: '%s'\n", rv, buf);

       sleep(5);
    }