update led and gpio program

guowenxue

2021-11-03 220397d6e51dd15d74fbd41cfdc9c72aced45119

 apue/2.Socket/socket_client.c

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

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

       sleep(5);
    }