update tsl2561 code, update delay time to 400ms

Guo Wenxue

2019-07-05 6d7b28e6a7836988247c188f4284861fe33410ae

 apue/2.Socket/socket_client.c

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

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

       sleep(5);
    }