python script to export data

src/export-data.py

@@ -0,0 +1,33 @@
+#!/usr/bin/python2
+
+import rosbag
+import sys
+import os
+from wlan_pioneer.msg import WlanSignalMsg
+from geometry_msgs.msg import Point
+import datetime
+
+inFileName = os.path.abspath(sys.argv[1])
+outFileName = os.path.join(os.path.dirname(inFileName), os.path.basename(inFileName).split(".")[0] + ".csv")
+count = 0
+pos = Point()
+bag = rosbag.Bag(inFileName)
+outFile = open(outFileName, "w")
+outFile.write("SecsSinceEpoch;xPos;yPos;level2G4;level5G\n")
+
+for topic, msg, timestamp in bag.read_messages(topics=['/wlan_signal', '/pose']):
+
+   if (topic == "/pose"):
+      pos = msg.pose.pose.position
+
+   if (topic == "/wlan_signal"):
+      timeStr = datetime.datetime.fromtimestamp(msg.timestamp.secs).isoformat()
+      outFile.write("%s;%f;%f;%d;%d\n"
+         % (timeStr, pos.x, pos.y, msg.level_2G4, msg.level_5G))
+
+   count += 1
+
+print "%d rows written to %s" % (count, outFileName)
+
+outFile.close()
+bag.close()