-device_type_t device_type;
-char *device;
-char *iface;
-char ifrname[IFNAMSIZ];
-char *device_info;
-
-int device_total_in = 0;
-int device_total_out = 0;
-
-bool setup_device(void)
-{
+static device_type_t device_type;
+char *device = NULL;
+char *iface = NULL;
+static char ifrname[IFNAMSIZ];
+static char *device_info;
+
+uint64_t device_in_packets = 0;
+uint64_t device_in_bytes = 0;
+uint64_t device_out_packets = 0;
+uint64_t device_out_bytes = 0;
+
+bool setup_device(void) {