protocol fixes

client.c

@@ -37,13 +37,15 @@ int client_connect(conn_handler handler, char *servip, int16_t port) {
     bzero(buffer, MAX_BUFSIZE);
     for (ret = 0; 0 == ret;) {
         ret = handler(buffer);
-        if(0 != ret)
+        if(0 > ret)
             break;
 
         if (0 >= write(connfd, buffer, strlen(buffer))) {
             printf("client_connect: cannot write to socket\n");
             ret = -1;
         }
+        if(0 != ret)
+            break;
 
         bzero(buffer, MAX_BUFSIZE);
         len = read(connfd, buffer, sizeof(buffer));