Add interval option to getopt

packet-exchange/src/server.c

@@ -320,7 +320,7 @@ static void process_options(int argc, char *argv[]) {
   int network_if_specified = 0;
 
   for (;;) {
-    int c = getopt(argc, argv, "ab:d:f:ghp:r:tv");
+    int c = getopt(argc, argv, "ab:d:f:ghi:p:r:tv");
 
     if (c == -1)
       break;