README and manpages for ndnping and ndnpingserver

refs #2818

Change-Id: I5ada2f4adbc234f0fdf11452560199df73a5314e
diff --git a/manpages/conf.py b/manpages/conf.py
index 20709a9..ea32680 100644
--- a/manpages/conf.py
+++ b/manpages/conf.py
@@ -8,4 +8,6 @@
 man_pages = [
     ('ndnpeek', 'ndnpeek', 'simple consumer to send one Interest and expect one Data', None, 1),
     ('ndnpoke', 'ndnpoke', 'simple producer to publish one Data', None, 1),
+    ('ndnping', 'ndnping', 'reachability testing client', None, 1),
+    ('ndnpingserver', 'ndnpingserver', 'reachability testing server', None, 1),
 ]
diff --git a/manpages/ndnping.rst b/manpages/ndnping.rst
new file mode 100644
index 0000000..41fc7a3
--- /dev/null
+++ b/manpages/ndnping.rst
@@ -0,0 +1,63 @@
+ndnping
+=======
+
+Usage
+-----
+
+::
+
+    ndnping [-h] [-V] [-i interval] [-o timeout] [-c count] [-n start] [-p identifier] [-a] [-t] prefix
+
+Description
+-----------
+
+``ndnping`` is a reachability testing tool that sends Interest packets and expects Data packets in
+response. If Data packets are not received within the timeout period for their Interest,
+``ndnping`` marks them as timed out. If ``ndnping`` does receive a Data packet within the timeout,
+the time from sending the Interest to receiving the Data is recorded and displayed. Once
+``ndnping`` either reaches the specified total number of Interests to be sent or receives an
+interrupt signal, it prints statistics on the Interests, including the number of Interests sent,
+the number of Data packets received, and the average response time of the Data.
+
+``prefix`` is interpreted as the Interest prefix. The name of the sent Interest consists of the
+prefix followed by "ping", the optional identifier specified by the '-p' option, and finally a
+sequence number as a decimal number string.
+
+Options
+-------
+
+``-h``
+  Print help and exit.
+
+``-V``
+  Print version and exit.
+
+``-i``
+  Set ping interval in milliseconds (default 1000ms - minimum 1ms).
+
+``-o``
+  Set ping timeout in milliseconds (default 4000ms).
+
+``-c``
+  Set total number of Interests to be sent.
+
+``-n``
+  Set the starting sequence number, which is incremented by 1 after each Interest sent.
+
+``-p``
+  Adds specified identifier to the Interest names before the numbers to avoid conflict.
+
+``-a``
+  Allows routers to return stale Data from cache.
+
+``-t``
+  Prints a timestamp with received Data and timeouts.
+
+Examples
+--------
+
+Test reachability for ``ndn:/edu/arizona`` using 4 Interest packets and print timestamp
+
+::
+
+    ndnping -c 4 -t ndn:/edu/arizona
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diff --git a/manpages/ndnpingserver.rst b/manpages/ndnpingserver.rst
new file mode 100644
index 0000000..da948d1
--- /dev/null
+++ b/manpages/ndnpingserver.rst
@@ -0,0 +1,53 @@
+ndnping
+=======
+
+Usage
+-----
+
+::
+
+    ndnpingserver [-h] [-V] [-x freshness] [-p satisfy] [-t] [-s size] prefix
+
+Description
+-----------
+
+``ndnpingserver`` listens for the specified Interest prefix and sends Data packets when an Interest
+under that prefix is received. Once ``ndnpingserver`` either reaches the specified total number of
+Interests to be satisfied or receives an interrupt signal, it prints the number of Data packets
+sent.
+
+``prefix`` is interpreted as the Interest prefix to listen for. The FreshnessPeriod of Data packets
+is set with the -x option (default 1000ms). The content is by default empty, but if a size is
+specified with the '-s' option, it contains the specified number of the letter "a". Finally, the
+Data is signed with an SHA256 digest.
+
+Options
+-------
+
+``-h``
+  Print help and exit.
+
+``-V``
+  Print version and exit.
+
+``-x``
+  Set freshness period in milliseconds (minimum 1000ms).
+
+``-p``
+  Set maximum number of pings to satisfy.
+
+``-t``
+  Prints a timestamp with received Data and timeouts.
+
+``-s``
+  Specify the size of the response payload.
+
+Examples
+--------
+
+Listen on ``ndn:/edu/arizona`` and response to at most 4 pings, printing timestamp on each received
+ping
+
+::
+
+    ndnpingserver -p 4 -t ndn:/edu/arizona
\ No newline at end of file