diff --git a/tests/gen-data.py b/tests/gen-data.py
new file mode 100755
index 0000000..ce1a302
--- /dev/null
+++ b/tests/gen-data.py
@@ -0,0 +1,56 @@
+#! /usr/bin/env python3
+from datetime import datetime, timezone, timedelta
+# import array
+import sys
+
+ifaces=[ 'eth0', 'eth1', 'eth2' ]
+state={}
+for i in ifaces:
+    state[i] = {
+        'rbytes': 1000,
+        'rpackets': 20,
+        'rerrs': 0,
+        'rdrop': 0,
+        'rfifo': 0,
+        'rframe': 0,
+        'rcomp': 0,
+        'rmulti': 10,
+        'tbytes': 2000,
+        'tpackets': 40,
+        'terrs': 0,
+        'tdrop': 0,
+        'tfifo': 0,
+        'tcoll': 0,
+        'tcarrier': 0,
+        'tcomp': 0
+    }
+
+
+d = datetime(2023, 2, 18, 0, 0, 0, tzinfo=timezone.utc)
+
+for i in range(8640):
+    print( d.strftime("=== %a %b %d %H:%M:%S %Z %Y ==="))
+    d += timedelta(seconds=10)
+    for iface in ifaces:
+        state[iface]['rbytes'] += 100000000
+
+        print("Inter-| Receive     | Transmit")
+        print(" face |bytes packets errs drop fifo frame compresses multicast|bytes packets errs drop fifo colls carrier compressed")
+        print("%s: %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d" % (
+            iface,
+            state[iface]["rbytes"],
+            state[iface]["rpackets"],
+            state[iface]["rerrs"],
+            state[iface]["rdrop"],
+            state[iface]["rfifo"],
+            state[iface]["rframe"],
+            state[iface]["rcomp"],
+            state[iface]["rmulti"],
+            state[iface]["tbytes"],
+            state[iface]["tpackets"],
+            state[iface]["terrs"],
+            state[iface]["tdrop"],
+            state[iface]["tfifo"],
+            state[iface]["tcoll"],
+            state[iface]["tcarrier"],
+            state[iface]["tcomp"]))