Willamette Valley Mesh - Git Server
Browse code

reorg_20202027

Gandolf authored on 10/27/2020 20:25:34
Showing 1 changed files
arednsig/aredn_fw_3_20_3_0/bin/createArednsigRrd.py
History View file @ fe97b8b
1 1 
deleted file mode 100755
... ... 
@@ -1,89 +0,0 @@
1 
-#!/usr/bin/python -u
2 
-## The -u option above turns off block buffering of python output. This assures
3 
-## that each error message gets individually printed to the log file.
4 
-#
5 
-# Module: createArednsigRrd.py
6 
-#
7 
-# Description: Creates a rrdtool database for use by the weather agent to
8 
-# store the data from the weather station.  The agent uses the data in the
9 
-# database to generate graphic charts for display in the weather station
10 
-# web page.
11 
-#
12 
-# Copyright 2020 Jeff Owrey
13 
-#    This program is free software: you can redistribute it and/or modify
14 
-#    it under the terms of the GNU General Public License as published by
15 
-#    the Free Software Foundation, either version 3 of the License, or
16 
-#    (at your option) any later version.
17 
-#
18 
-#    This program is distributed in the hope that it will be useful,
19 
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
20 
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21 
-#    GNU General Public License for more details.
22 
-#
23 
-#    You should have received a copy of the GNU General Public License
24 
-#    along with this program.  If not, see http://www.gnu.org/license.
25 
-#
26 
-# Revision History
27 
-#   * v10 released 11 Jan 2020 by J L Owrey
28 
-#
29 
-import os
30 
-import time
31 
-import subprocess
32 
-
33 
-    ### DEFINE FILE LOCATIONS ###
34 
-
35 
-_USER = os.environ['USER']
36 
-# the file that stores the data
37 
-_RRD_FILE = "/home/%s/database/arednsigData.rrd" % _USER
38 
-_RRD_SIZE_IN_DAYS = 370 # days
39 
-_1YR_RRA_STEPS_PER_DAY = 96
40 
-_DATABASE_UPDATE_INTERVAL = 60
41 
-
42 
-def createRrdFile():
43 
-    """Create the rrd file if it does not exist.
44 
-       Parameters: none
45 
-       Returns: True, if successful
46 
-    """
47 
-
48 
-    if os.path.exists(_RRD_FILE):
49 
-        print "aredn node database already exists"
50 
-        return True
51 
-
52 
-     ## Calculate database size
53 
-
54 
-    heartBeat = 2 * _DATABASE_UPDATE_INTERVAL
55 
-    rra1yrNumPDP =  int(round(86400 / (_1YR_RRA_STEPS_PER_DAY * \
56 
-                    _DATABASE_UPDATE_INTERVAL)))
57 
-    rrd24hrNumRows = int(round(86400 / _DATABASE_UPDATE_INTERVAL))
58 
-    rrd1yearNumRows = _1YR_RRA_STEPS_PER_DAY * _RRD_SIZE_IN_DAYS
59 
-
60 
-    strFmt = ("rrdtool create %s --start now-1day --step %s "
61 
-              "DS:S:GAUGE:%s:U:U DS:N:GAUGE:%s:U:U DS:SNR:GAUGE:%s:U:U "
62 
-              "DS:RX_MCS:GAUGE:%s:U:U DS:TX_MCS:GAUGE:%s:U:U "
63 
-              "DS:RX_RATE:GAUGE:%s:U:U DS:TX_RATE:GAUGE:%s:U:U "
64 
-              "RRA:LAST:0.5:1:%s RRA:LAST:0.5:%s:%s")
65 
-
66 
-    strCmd = strFmt % (_RRD_FILE, _DATABASE_UPDATE_INTERVAL, \
67 
-                heartBeat, heartBeat, heartBeat, heartBeat,  \
68 
-                heartBeat,  heartBeat, heartBeat,            \
69 
-                rrd24hrNumRows, rra1yrNumPDP, rrd1yearNumRows)
70 
-
71 
-    print "creating aredn node database...\n\n%s\n" % strCmd
72 
-
73 
-    # Spawn a sub-shell and run the command
74 
-    try:
75 
-        subprocess.check_output(strCmd, stderr=subprocess.STDOUT, \
76 
-                                shell=True)
77 
-    except subprocess.CalledProcessError, exError:
78 
-        print "rrdtool create failed: %s" % (exError.output)
79 
-        return False
80 
-    return True
81 
-##end def
82 
-
83 
-def main():
84 
-    createRrdFile()
85 
-## end def
86 
-
87 
-if __name__ == '__main__':
88 
-    main()
89 
-
Browse code

add version for FW v3.20

Gandolf authored on 10/03/2020 23:02:19
Showing 1 changed files
arednsig/aredn_fw_3_20_3_0/bin/createArednsigRrd.py
History View file @ 11c3de6
1 1 
new file mode 100755
... ... 
@@ -0,0 +1,89 @@
1 
+#!/usr/bin/python -u
2 
+## The -u option above turns off block buffering of python output. This assures
3 
+## that each error message gets individually printed to the log file.
4 
+#
5 
+# Module: createArednsigRrd.py
6 
+#
7 
+# Description: Creates a rrdtool database for use by the weather agent to
8 
+# store the data from the weather station.  The agent uses the data in the
9 
+# database to generate graphic charts for display in the weather station
10 
+# web page.
11 
+#
12 
+# Copyright 2020 Jeff Owrey
13 
+#    This program is free software: you can redistribute it and/or modify
14 
+#    it under the terms of the GNU General Public License as published by
15 
+#    the Free Software Foundation, either version 3 of the License, or
16 
+#    (at your option) any later version.
17 
+#
18 
+#    This program is distributed in the hope that it will be useful,
19 
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
20 
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21 
+#    GNU General Public License for more details.
22 
+#
23 
+#    You should have received a copy of the GNU General Public License
24 
+#    along with this program.  If not, see http://www.gnu.org/license.
25 
+#
26 
+# Revision History
27 
+#   * v10 released 11 Jan 2020 by J L Owrey
28 
+#
29 
+import os
30 
+import time
31 
+import subprocess
32 
+
33 
+    ### DEFINE FILE LOCATIONS ###
34 
+
35 
+_USER = os.environ['USER']
36 
+# the file that stores the data
37 
+_RRD_FILE = "/home/%s/database/arednsigData.rrd" % _USER
38 
+_RRD_SIZE_IN_DAYS = 370 # days
39 
+_1YR_RRA_STEPS_PER_DAY = 96
40 
+_DATABASE_UPDATE_INTERVAL = 60
41 
+
42 
+def createRrdFile():
43 
+    """Create the rrd file if it does not exist.
44 
+       Parameters: none
45 
+       Returns: True, if successful
46 
+    """
47 
+
48 
+    if os.path.exists(_RRD_FILE):
49 
+        print "aredn node database already exists"
50 
+        return True
51 
+
52 
+     ## Calculate database size
53 
+
54 
+    heartBeat = 2 * _DATABASE_UPDATE_INTERVAL
55 
+    rra1yrNumPDP =  int(round(86400 / (_1YR_RRA_STEPS_PER_DAY * \
56 
+                    _DATABASE_UPDATE_INTERVAL)))
57 
+    rrd24hrNumRows = int(round(86400 / _DATABASE_UPDATE_INTERVAL))
58 
+    rrd1yearNumRows = _1YR_RRA_STEPS_PER_DAY * _RRD_SIZE_IN_DAYS
59 
+
60 
+    strFmt = ("rrdtool create %s --start now-1day --step %s "
61 
+              "DS:S:GAUGE:%s:U:U DS:N:GAUGE:%s:U:U DS:SNR:GAUGE:%s:U:U "
62 
+              "DS:RX_MCS:GAUGE:%s:U:U DS:TX_MCS:GAUGE:%s:U:U "
63 
+              "DS:RX_RATE:GAUGE:%s:U:U DS:TX_RATE:GAUGE:%s:U:U "
64 
+              "RRA:LAST:0.5:1:%s RRA:LAST:0.5:%s:%s")
65 
+
66 
+    strCmd = strFmt % (_RRD_FILE, _DATABASE_UPDATE_INTERVAL, \
67 
+                heartBeat, heartBeat, heartBeat, heartBeat,  \
68 
+                heartBeat,  heartBeat, heartBeat,            \
69 
+                rrd24hrNumRows, rra1yrNumPDP, rrd1yearNumRows)
70 
+
71 
+    print "creating aredn node database...\n\n%s\n" % strCmd
72 
+
73 
+    # Spawn a sub-shell and run the command
74 
+    try:
75 
+        subprocess.check_output(strCmd, stderr=subprocess.STDOUT, \
76 
+                                shell=True)
77 
+    except subprocess.CalledProcessError, exError:
78 
+        print "rrdtool create failed: %s" % (exError.output)
79 
+        return False
80 
+    return True
81 
+##end def
82 
+
83 
+def main():
84 
+    createRrdFile()
85 
+## end def
86 
+
87 
+if __name__ == '__main__':
88 
+    main()
89 
+
Browse code

remove old versions

Gandolf authored on 10/03/2020 23:00:21
Showing 1 changed files
arednsig/aredn_fw_3_20_3_0/bin/createArednsigRrd.py
History View file @ 6d1202b
1 1 
deleted file mode 100755
... ... 
@@ -1,89 +0,0 @@
1 
-#!/usr/bin/python -u
2 
-## The -u option above turns off block buffering of python output. This assures
3 
-## that each error message gets individually printed to the log file.
4 
-#
5 
-# Module: createArednsigRrd.py
6 
-#
7 
-# Description: Creates a rrdtool database for use by the weather agent to
8 
-# store the data from the weather station.  The agent uses the data in the
9 
-# database to generate graphic charts for display in the weather station
10 
-# web page.
11 
-#
12 
-# Copyright 2020 Jeff Owrey
13 
-#    This program is free software: you can redistribute it and/or modify
14 
-#    it under the terms of the GNU General Public License as published by
15 
-#    the Free Software Foundation, either version 3 of the License, or
16 
-#    (at your option) any later version.
17 
-#
18 
-#    This program is distributed in the hope that it will be useful,
19 
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
20 
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21 
-#    GNU General Public License for more details.
22 
-#
23 
-#    You should have received a copy of the GNU General Public License
24 
-#    along with this program.  If not, see http://www.gnu.org/license.
25 
-#
26 
-# Revision History
27 
-#   * v10 released 11 Jan 2020 by J L Owrey
28 
-#
29 
-import os
30 
-import time
31 
-import subprocess
32 
-
33 
-    ### DEFINE FILE LOCATIONS ###
34 
-
35 
-_USER = os.environ['USER']
36 
-# the file that stores the data
37 
-_RRD_FILE = "/home/%s/database/arednsigData.rrd" % _USER
38 
-_RRD_SIZE_IN_DAYS = 370 # days
39 
-_1YR_RRA_STEPS_PER_DAY = 96
40 
-_DATABASE_UPDATE_INTERVAL = 60
41 
-
42 
-def createRrdFile():
43 
-    """Create the rrd file if it does not exist.
44 
-       Parameters: none
45 
-       Returns: True, if successful
46 
-    """
47 
-
48 
-    if os.path.exists(_RRD_FILE):
49 
-        print "aredn node database already exists"
50 
-        return True
51 
-
52 
-     ## Calculate database size
53 
-
54 
-    heartBeat = 2 * _DATABASE_UPDATE_INTERVAL
55 
-    rra1yrNumPDP =  int(round(86400 / (_1YR_RRA_STEPS_PER_DAY * \
56 
-                    _DATABASE_UPDATE_INTERVAL)))
57 
-    rrd24hrNumRows = int(round(86400 / _DATABASE_UPDATE_INTERVAL))
58 
-    rrd1yearNumRows = _1YR_RRA_STEPS_PER_DAY * _RRD_SIZE_IN_DAYS
59 
-
60 
-    strFmt = ("rrdtool create %s --start now-1day --step %s "
61 
-              "DS:S:GAUGE:%s:U:U DS:N:GAUGE:%s:U:U DS:SNR:GAUGE:%s:U:U "
62 
-              "DS:RX_MCS:GAUGE:%s:U:U DS:TX_MCS:GAUGE:%s:U:U "
63 
-              "DS:RX_RATE:GAUGE:%s:U:U DS:TX_RATE:GAUGE:%s:U:U "
64 
-              "RRA:LAST:0.5:1:%s RRA:LAST:0.5:%s:%s")
65 
-
66 
-    strCmd = strFmt % (_RRD_FILE, _DATABASE_UPDATE_INTERVAL, \
67 
-                heartBeat, heartBeat, heartBeat, heartBeat,  \
68 
-                heartBeat,  heartBeat, heartBeat,            \
69 
-                rrd24hrNumRows, rra1yrNumPDP, rrd1yearNumRows)
70 
-
71 
-    print "creating aredn node database...\n\n%s\n" % strCmd
72 
-
73 
-    # Spawn a sub-shell and run the command
74 
-    try:
75 
-        subprocess.check_output(strCmd, stderr=subprocess.STDOUT, \
76 
-                                shell=True)
77 
-    except subprocess.CalledProcessError, exError:
78 
-        print "rrdtool create failed: %s" % (exError.output)
79 
-        return False
80 
-    return True
81 
-##end def
82 
-
83 
-def main():
84 
-    createRrdFile()
85 
-## end def
86 
-
87 
-if __name__ == '__main__':
88 
-    main()
89 
-
Browse code

support for Aredn firmware version 3.20.3.0

gandolf authored on 03/31/2020 18:07:19
Showing 1 changed files
arednsig/aredn_fw_3_20_3_0/bin/createArednsigRrd.py
History View file @ 7abcd97
1 1 
new file mode 100755
... ... 
@@ -0,0 +1,89 @@
1 
+#!/usr/bin/python -u
2 
+## The -u option above turns off block buffering of python output. This assures
3 
+## that each error message gets individually printed to the log file.
4 
+#
5 
+# Module: createArednsigRrd.py
6 
+#
7 
+# Description: Creates a rrdtool database for use by the weather agent to
8 
+# store the data from the weather station.  The agent uses the data in the
9 
+# database to generate graphic charts for display in the weather station
10 
+# web page.
11 
+#
12 
+# Copyright 2020 Jeff Owrey
13 
+#    This program is free software: you can redistribute it and/or modify
14 
+#    it under the terms of the GNU General Public License as published by
15 
+#    the Free Software Foundation, either version 3 of the License, or
16 
+#    (at your option) any later version.
17 
+#
18 
+#    This program is distributed in the hope that it will be useful,
19 
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
20 
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21 
+#    GNU General Public License for more details.
22 
+#
23 
+#    You should have received a copy of the GNU General Public License
24 
+#    along with this program.  If not, see http://www.gnu.org/license.
25 
+#
26 
+# Revision History
27 
+#   * v10 released 11 Jan 2020 by J L Owrey
28 
+#
29 
+import os
30 
+import time
31 
+import subprocess
32 
+
33 
+    ### DEFINE FILE LOCATIONS ###
34 
+
35 
+_USER = os.environ['USER']
36 
+# the file that stores the data
37 
+_RRD_FILE = "/home/%s/database/arednsigData.rrd" % _USER
38 
+_RRD_SIZE_IN_DAYS = 370 # days
39 
+_1YR_RRA_STEPS_PER_DAY = 96
40 
+_DATABASE_UPDATE_INTERVAL = 60
41 
+
42 
+def createRrdFile():
43 
+    """Create the rrd file if it does not exist.
44 
+       Parameters: none
45 
+       Returns: True, if successful
46 
+    """
47 
+
48 
+    if os.path.exists(_RRD_FILE):
49 
+        print "aredn node database already exists"
50 
+        return True
51 
+
52 
+     ## Calculate database size
53 
+
54 
+    heartBeat = 2 * _DATABASE_UPDATE_INTERVAL
55 
+    rra1yrNumPDP =  int(round(86400 / (_1YR_RRA_STEPS_PER_DAY * \
56 
+                    _DATABASE_UPDATE_INTERVAL)))
57 
+    rrd24hrNumRows = int(round(86400 / _DATABASE_UPDATE_INTERVAL))
58 
+    rrd1yearNumRows = _1YR_RRA_STEPS_PER_DAY * _RRD_SIZE_IN_DAYS
59 
+
60 
+    strFmt = ("rrdtool create %s --start now-1day --step %s "
61 
+              "DS:S:GAUGE:%s:U:U DS:N:GAUGE:%s:U:U DS:SNR:GAUGE:%s:U:U "
62 
+              "DS:RX_MCS:GAUGE:%s:U:U DS:TX_MCS:GAUGE:%s:U:U "
63 
+              "DS:RX_RATE:GAUGE:%s:U:U DS:TX_RATE:GAUGE:%s:U:U "
64 
+              "RRA:LAST:0.5:1:%s RRA:LAST:0.5:%s:%s")
65 
+
66 
+    strCmd = strFmt % (_RRD_FILE, _DATABASE_UPDATE_INTERVAL, \
67 
+                heartBeat, heartBeat, heartBeat, heartBeat,  \
68 
+                heartBeat,  heartBeat, heartBeat,            \
69 
+                rrd24hrNumRows, rra1yrNumPDP, rrd1yearNumRows)
70 
+
71 
+    print "creating aredn node database...\n\n%s\n" % strCmd
72 
+
73 
+    # Spawn a sub-shell and run the command
74 
+    try:
75 
+        subprocess.check_output(strCmd, stderr=subprocess.STDOUT, \
76 
+                                shell=True)
77 
+    except subprocess.CalledProcessError, exError:
78 
+        print "rrdtool create failed: %s" % (exError.output)
79 
+        return False
80 
+    return True
81 
+##end def
82 
+
83 
+def main():
84 
+    createRrdFile()
85 
+## end def
86 
+
87 
+if __name__ == '__main__':
88 
+    main()
89 
+
Browse code

fix version numbers

gandolf authored on 03/31/2020 18:04:12
Showing 1 changed files
arednsig/aredn_fw_3_20_3_0/bin/createArednsigRrd.py
History View file @ 30aea67
1 1 
deleted file mode 100755
... ... 
@@ -1,89 +0,0 @@
1 
-#!/usr/bin/python -u
2 
-## The -u option above turns off block buffering of python output. This assures
3 
-## that each error message gets individually printed to the log file.
4 
-#
5 
-# Module: createArednsigRrd.py
6 
-#
7 
-# Description: Creates a rrdtool database for use by the weather agent to
8 
-# store the data from the weather station.  The agent uses the data in the
9 
-# database to generate graphic charts for display in the weather station
10 
-# web page.
11 
-#
12 
-# Copyright 2020 Jeff Owrey
13 
-#    This program is free software: you can redistribute it and/or modify
14 
-#    it under the terms of the GNU General Public License as published by
15 
-#    the Free Software Foundation, either version 3 of the License, or
16 
-#    (at your option) any later version.
17 
-#
18 
-#    This program is distributed in the hope that it will be useful,
19 
-#    but WITHOUT ANY WARRANTY; without even the implied warranty of
20 
-#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21 
-#    GNU General Public License for more details.
22 
-#
23 
-#    You should have received a copy of the GNU General Public License
24 
-#    along with this program.  If not, see http://www.gnu.org/license.
25 
-#
26 
-# Revision History
27 
-#   * v10 released 11 Jan 2020 by J L Owrey
28 
-#
29 
-import os
30 
-import time
31 
-import subprocess
32 
-
33 
-    ### DEFINE FILE LOCATIONS ###
34 
-
35 
-_USER = os.environ['USER']
36 
-# the file that stores the data
37 
-_RRD_FILE = "/home/%s/database/arednsigData.rrd" % _USER
38 
-_RRD_SIZE_IN_DAYS = 370 # days
39 
-_1YR_RRA_STEPS_PER_DAY = 96
40 
-_DATABASE_UPDATE_INTERVAL = 60
41 
-
42 
-def createRrdFile():
43 
-    """Create the rrd file if it does not exist.
44 
-       Parameters: none
45 
-       Returns: True, if successful
46 
-    """
47 
-
48 
-    if os.path.exists(_RRD_FILE):
49 
-        print "aredn node database already exists"
50 
-        return True
51 
-
52 
-     ## Calculate database size
53 
-
54 
-    heartBeat = 2 * _DATABASE_UPDATE_INTERVAL
55 
-    rra1yrNumPDP =  int(round(86400 / (_1YR_RRA_STEPS_PER_DAY * \
56 
-                    _DATABASE_UPDATE_INTERVAL)))
57 
-    rrd24hrNumRows = int(round(86400 / _DATABASE_UPDATE_INTERVAL))
58 
-    rrd1yearNumRows = _1YR_RRA_STEPS_PER_DAY * _RRD_SIZE_IN_DAYS
59 
-
60 
-    strFmt = ("rrdtool create %s --start now-1day --step %s "
61 
-              "DS:S:GAUGE:%s:U:U DS:N:GAUGE:%s:U:U DS:SNR:GAUGE:%s:U:U "
62 
-              "DS:RX_MCS:GAUGE:%s:U:U DS:TX_MCS:GAUGE:%s:U:U "
63 
-              "DS:RX_RATE:GAUGE:%s:U:U DS:TX_RATE:GAUGE:%s:U:U "
64 
-              "RRA:LAST:0.5:1:%s RRA:LAST:0.5:%s:%s")
65 
-
66 
-    strCmd = strFmt % (_RRD_FILE, _DATABASE_UPDATE_INTERVAL, \
67 
-                heartBeat, heartBeat, heartBeat, heartBeat,  \
68 
-                heartBeat,  heartBeat, heartBeat,            \
69 
-                rrd24hrNumRows, rra1yrNumPDP, rrd1yearNumRows)
70 
-
71 
-    print "creating aredn node database...\n\n%s\n" % strCmd
72 
-
73 
-    # Spawn a sub-shell and run the command
74 
-    try:
75 
-        subprocess.check_output(strCmd, stderr=subprocess.STDOUT, \
76 
-                                shell=True)
77 
-    except subprocess.CalledProcessError, exError:
78 
-        print "rrdtool create failed: %s" % (exError.output)
79 
-        return False
80 
-    return True
81 
-##end def
82 
-
83 
-def main():
84 
-    createRrdFile()
85 
-## end def
86 
-
87 
-if __name__ == '__main__':
88 
-    main()
89 
-
Browse code

support for Aredn FW v3.19.3.0

gandolf authored on 03/31/2020 17:38:41
Showing 1 changed files
arednsig/aredn_fw_3_20_3_0/bin/createArednsigRrd.py
History View file @ e500c96
1 1 
new file mode 100755
... ... 
@@ -0,0 +1,89 @@
1 
+#!/usr/bin/python -u
2 
+## The -u option above turns off block buffering of python output. This assures
3 
+## that each error message gets individually printed to the log file.
4 
+#
5 
+# Module: createArednsigRrd.py
6 
+#
7 
+# Description: Creates a rrdtool database for use by the weather agent to
8 
+# store the data from the weather station.  The agent uses the data in the
9 
+# database to generate graphic charts for display in the weather station
10 
+# web page.
11 
+#
12 
+# Copyright 2020 Jeff Owrey
13 
+#    This program is free software: you can redistribute it and/or modify
14 
+#    it under the terms of the GNU General Public License as published by
15 
+#    the Free Software Foundation, either version 3 of the License, or
16 
+#    (at your option) any later version.
17 
+#
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+#    This program is distributed in the hope that it will be useful,
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+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
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+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+#    GNU General Public License for more details.
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+#
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+#    You should have received a copy of the GNU General Public License
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+#    along with this program.  If not, see http://www.gnu.org/license.
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+#
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+# Revision History
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+#   * v10 released 11 Jan 2020 by J L Owrey
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+#
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+import os
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+import time
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+import subprocess
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+
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+    ### DEFINE FILE LOCATIONS ###
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+
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+_USER = os.environ['USER']
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+# the file that stores the data
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+_RRD_FILE = "/home/%s/database/arednsigData.rrd" % _USER
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+_RRD_SIZE_IN_DAYS = 370 # days
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+_1YR_RRA_STEPS_PER_DAY = 96
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+_DATABASE_UPDATE_INTERVAL = 60
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+
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+def createRrdFile():
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+    """Create the rrd file if it does not exist.
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+       Parameters: none
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+       Returns: True, if successful
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+    """
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+
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+    if os.path.exists(_RRD_FILE):
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+        print "aredn node database already exists"
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+        return True
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+
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+     ## Calculate database size
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+
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+    heartBeat = 2 * _DATABASE_UPDATE_INTERVAL
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+    rra1yrNumPDP =  int(round(86400 / (_1YR_RRA_STEPS_PER_DAY * \
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+                    _DATABASE_UPDATE_INTERVAL)))
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+    rrd24hrNumRows = int(round(86400 / _DATABASE_UPDATE_INTERVAL))
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+    rrd1yearNumRows = _1YR_RRA_STEPS_PER_DAY * _RRD_SIZE_IN_DAYS
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+
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+    strFmt = ("rrdtool create %s --start now-1day --step %s "
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+              "DS:S:GAUGE:%s:U:U DS:N:GAUGE:%s:U:U DS:SNR:GAUGE:%s:U:U "
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+              "DS:RX_MCS:GAUGE:%s:U:U DS:TX_MCS:GAUGE:%s:U:U "
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+              "DS:RX_RATE:GAUGE:%s:U:U DS:TX_RATE:GAUGE:%s:U:U "
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+              "RRA:LAST:0.5:1:%s RRA:LAST:0.5:%s:%s")
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+
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+    strCmd = strFmt % (_RRD_FILE, _DATABASE_UPDATE_INTERVAL, \
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+                heartBeat, heartBeat, heartBeat, heartBeat,  \
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+                heartBeat,  heartBeat, heartBeat,            \
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+                rrd24hrNumRows, rra1yrNumPDP, rrd1yearNumRows)
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+
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+    print "creating aredn node database...\n\n%s\n" % strCmd
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+
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+    # Spawn a sub-shell and run the command
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+    try:
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+        subprocess.check_output(strCmd, stderr=subprocess.STDOUT, \
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+                                shell=True)
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+    except subprocess.CalledProcessError, exError:
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+        print "rrdtool create failed: %s" % (exError.output)
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+        return False
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+    return True
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+##end def
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+
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+def main():
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+    createRrdFile()
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+## end def
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+
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+if __name__ == '__main__':
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+    main()
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+