Add NDN Play integration to Mini-NDN code base

Integrate the minindn_play project by Varun Patil into
the base Mini-NDN codebase; this will allow for the
use of the NDN-Play browser UI with minimal additional
dependencies or setup.

Refs #5359

Change-Id: I4fedfa885b07d7fe946a18c6d9b5016d291b3582
diff --git a/examples/ndn_play_demo.py b/examples/ndn_play_demo.py
new file mode 100644
index 0000000..6b2c9de
--- /dev/null
+++ b/examples/ndn_play_demo.py
@@ -0,0 +1,68 @@
+# -*- Mode:python; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+#
+# Copyright (C) 2015-2020, The University of Memphis,
+#                          Arizona Board of Regents,
+#                          Regents of the University of California.
+#
+# This file is part of Mini-NDN.
+# See AUTHORS.md for a complete list of Mini-NDN authors and contributors.
+#
+# Mini-NDN is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Mini-NDN is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Mini-NDN, e.g., in COPYING.md file.
+# If not, see <http://www.gnu.org/licenses/>.
+
+from mininet.log import setLogLevel, info
+
+from minindn.minindn import Minindn
+from minindn.apps.nfd import Nfd
+from minindn.apps.tshark import Tshark
+from minindn.apps.app_manager import AppManager
+from minindn.minindn_play.server import PlayServer
+from minindn.minindn_play.monitor import LogMonitor
+
+if __name__ == '__main__':
+    setLogLevel('info')
+
+    Minindn.cleanUp()
+    Minindn.verifyDependencies()
+
+    ndn = Minindn()
+
+    ndn.start()
+
+    info('Starting NFD on nodes\n')
+    nfds = AppManager(ndn, ndn.net.hosts, Nfd, logLevel="DEBUG")
+
+    info('Starting TShark on nodes\n')
+    sharks = AppManager(ndn, ndn.net.hosts, Tshark, singleLogFile=True)
+
+    ndn.initParams(ndn.net.hosts)
+
+    # Set the color of a node
+    ndn.net.hosts[0].params['params']['color'] = "orange"
+
+    # Starts the MiniNDN NDN-Play server
+    # This should print a URL you can open to connect to NDN-Play
+    # Port 8765 must be forwarded from the host running MiniNDN
+    # to the machine running the browser
+    server = PlayServer(ndn.net)
+
+    # This method will track updates to the nfd.log file on each node,
+    # changing the color briefly to indicate updates. This can be used
+    # for a variety of purposes to visualize activity, and is not restricted
+    # to just the NFD log file.
+    server.add_monitor(LogMonitor(ndn.net.hosts, "log/nfd.log", interval=0.2, regex_filter=""))
+
+    server.start()
+
+    ndn.stop()