Troubleshooting for VANET Simulation

Guide for Sumo

• Link for the Sumo Website - http://www.dlr.de/ts/en/desktopdefault.aspx/tabid-9883/16931_read-41000/ for help related to Sumo.
• In case sumo Configuration files do not open, Right click on any Sumo Configuration file, go to propertiesopen withsumo.
• While Running NetSim Vanet Simulation – If any message pops up as “SUMO_HOME” Not found Go to My computer System Properties Advanced system settings Environment Variables. Add an Environment variable as “SUMO_HOME”.
• Sumo Configuration File must contain the paths of the Vehicle routes and Networks file.
• Set the exact End Time for Sumo Simulation in Sumo Configuration File.

Guide for Python

• Any Python 2.7 version Installer would work fine for running simulations.
• If you have installed python by an external Installer, make sure the Python Path is set. It would be set automatically by python installer that comes with NetSim.
• In case “Pywin 32” is not getting installed, or during simulation, error occurs as “win32 modules not found” try the code below (Run it as a python Code).

import sys

from _winreg import *

tweak as necessary

version = sys.version[:3]

installpath = sys.prefix

regpath = "SOFTWARE\Python\Pythoncore\%s\" % (version)

installkey = "InstallPath"

pythonkey = "PythonPath"

pythonpath = "%s;%s\Lib\;%s\DLLs\" % (

installpath, installpath, installpath

)

def RegisterPy():

try:

reg = OpenKey(HKEY_CURRENT_USER, regpath)

except EnvironmentError as e:

try:

reg = CreateKey(HKEY_CURRENT_USER, regpath)

SetValue(reg, installkey, REG_SZ, installpath)

SetValue(reg, pythonkey, REG_SZ, pythonpath)

CloseKey(reg)

except:

print "* Unable to register!"

return

print "--- Python", version, "is now registered!"

return

if (QueryValue(reg, installkey) == installpath and

QueryValue(reg, pythonkey) == pythonpath):

CloseKey(reg)

print "=== Python", version, "is already registered!"

return

CloseKey(reg)

print "* Unable to register!"

print "* You probably have another Python installation!"

if name == "main":

RegisterPy()

VANET Simulation

1. Changing Vehicle (Node) Names, Moving or deleting vehicles etc are disabled in Vanets Simulation.
2. On running simulation, Backend calls Python file.
3. Backend waits for the Pipes connection to be established.

Python

• SUMO_HOME Environment variable is checked. If Environment variable is not present, Error is displayed as “key interrupt error” in SUMO_HOME.
• Python File waits for Pipes connection. (“waiting for pipes to connect”).
• It reads initial data as GUI enable/disable from backend.
• “Checking sumo” is printed. If the environment variable SUMO_HOME points to wrong directory, error is displayed.
• Sumo Simulation is started where Sumo Binary is checked (To check Sumo.exe or Sumo GUI are working in the system or not). Then a TCP connection is made
• A while loop runs – It follows the following procedure
  1. Send Garbage value to Backend to clear pipe buffers (pipes).
  2. Read Vehicle name from NetSim (pipes).
  3. Compare with each vehicle present in Sumo. If vehicle is present –Then write confirmation (pipes) and read its position from NetSim (2pipes for X and Y coordinates). Also, sumo is stepped forward for every first vehicle In the list of current vehicles in sumo.
  4. If vehicle not present, fail (‘f’) is sent.
  5. Pipes and TCP closed.

Backend

• After establishing the connection, Backend checks for GUI flag, send ‘1’ if animation status is online.
• Simulation proceeds. Each time, backend Sends vehicle name to python, and receives XY positions, which are passed from python.
• Positions are updated and simulation proceeds.