t/udpflood: Test program to simulate transmission bursts

It is useful to verify E-UTRAN IP Throughput KPI implementation, as
that KPI is defined in terms of burst samples.

t/udpflood

+#!/usr/bin/env python
+# Copyright (C) 2023  Nexedi SA and Contributors.
+#                     Kirill Smelkov <kirr@nexedi.com>
+#
+# This program is free software: you can Use, Study, Modify and Redistribute
+# it under the terms of the GNU General Public License version 3, or (at your
+# option) any later version, as published by the Free Software Foundation.
+#
+# You can also Link and Combine this program with other software covered by
+# the terms of any of the Free Software licenses or any of the Open Source
+# Initiative approved licenses and Convey the resulting work. Corresponding
+# source of such a combination shall include the source code for all other
+# software used.
+#
+# This program is distributed WITHOUT ANY WARRANTY; without even the implied
+# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# See COPYING file for full licensing terms.
+# See https://www.nexedi.com/licensing for rationale and options.
+"""Program udpflood sends/floods packets via UDP.
+
+It is useful to test how E-UTRAN IP Throughput KPI implementation handles bursts.
+
+Usage: udpflood host:port npkt/period pause_ms
+"""
+
+import sys, time
+from socket import socket, AF_INET, SOCK_DGRAM, IPPROTO_UDP
+
+
+def main():
+    addr = sys.argv[1]
+    host, port = addr.split(':')
+    port = int(port)
+
+    npkt_period = 1
+    pause_ms = 0
+
+    if len(sys.argv) >= 3:
+        npkt_period = int(sys.argv[2])
+
+    if len(sys.argv) >= 4:
+        pause_ms = int(sys.argv[3])
+
+    print("# udpflood -> %s :%s  %d pkt/period, %dms pause in between periods" %
+            (host, port, npkt_period, pause_ms))
+
+    sk = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)
+
+    pkt = b'\xff'*1000
+
+    while 1:
+        for _ in range(npkt_period):
+            sk.sendto(pkt, (host, port))
+        if pause_ms:
+            time.sleep(pause_ms*0.001)
+
+
+if __name__ == '__main__':
+    main()