return numpy array from tracker, port urrtmon to python3

tools/get_rob.py

@@ -1,12 +1,18 @@
 #!/usr/bin/env python
+import sys
+import logging
+from math import pi
+
 from urx import Robot
 import math3d
-from math import pi
-import logging
 
 if __name__ == "__main__":
+    if len(sys.argv) > 1:
+        host = sys.argv[1]
+    else:
+        host = 'localhost'
     try:
-        robot = Robot( 'localhost')#, logLevel=logging.DEBUG, parserLogLevel=logging.DEBUG)
+        robot = Robot( host )#, logLevel=logging.DEBUG, parserLogLevel=logging.DEBUG)
         r = robot
         from IPython.frontend.terminal.embed import InteractiveShellEmbed
         ipshell = InteractiveShellEmbed( banner1="\nStarting IPython shell, robot object is available\n")