jiangjik

Hi everyone here,

I'm new here. But i'm actually doing a project regarding wireless LAN. i have used netstumbler to detect the signal strength and SNR. WHat i want to do is to produce a program.. a simple one with conditional codes like "if..this else.. that" i want to use the signal strength, SNR and maybe the no. of mobile host attached to a access point/ traffic situationas the variables to decide my handover process. But i can't even get the basic variable like signal strength and SNR. i have problem interfacing to netstumbler so i though i might develop my own with some examples i can look at. I'm very bad at programming cause i have only done basic C programming a very long time ago, but i'm willing to learn the new language. can anyone suggest which direction should i go into? How can i get examples for the codes to start scan, for the API to carry out the handover from one access point to another.. ok let keep it simple. can can i just detect the signal strength and purely depends on the signal strength to carry out a handover from AP1 to AP2, for example. What i plan is to write the program in C and call the functions to carry out various work. I won't plagiarise i will reference all the names if i'm using their work / function. Hope some one can give me a little hint / help... i'm desperated... because i'm given this project which belongs to telecommuniation side, but i have totally no knowledge of telecommunication because i'm purely from Electrical engineering. Thank you very much!

Help is very much needed. Thanks all.... and pls forgive me if i happen to ask the same stupid questions that have already been asked.

Thanks

Best Regards

Patrick

Madhadder

Here is the Default NS Script
----------------------------------------------------
Default event handler script

'Sub OnEnableScan
' PlaySound "SSROAM.WAV"
'End Sub

'Sub OnDisableScan
' PlaySound "SSROAM.WAV"
'End Sub

'Sub OnScanStart
' PlaySound "Windows XP Balloon.WAV"
'End Sub

'Sub OnScanResult(SSID, BSSID, CapFlags, Signal, Noise, LastSeen) ' NOT YET
' SSID : String : SSID (Network name)
' BSSID : String : BSSID (MAC address)
' CapFlags : Integer : 802.11 capability flags
' Signal : Integer : signal level (dBm)
' Noise : Integer : noise level(dBm)
' LastSeen : Time : When this BSSID was last seen
'End Sub

Sub OnScanComplete(FoundNew, SeenBefore, LostContact, BestSNR) ' NOT YET
' FoundNew : Integer : Count of new BSSIDs
' SeenBefore : Integer : Count of not-new BSSIDs
' LostContact : Integer : Count of BSSIDs missed since last scan
' BestSNR : Integer : SNR of strongest signal (dBm)

' MsgBox "OnScanComplete " & FoundNew & " " & SeenBefore & " " & LostContact & " " & BestSNR
If FoundNew>0 Then
PlaySound "ns-aos-new.WAV"
ElseIf LostContact>0 Then
PlaySound "ns-los.WAV"
ElseIf SeenBefore>0 Then
' Still seeing some
If BestSNR >= 60 Then
PlaySound "ns-signal-6.WAV"
ElseIf BestSNR >= 50 Then
PlaySound "ns-signal-5.WAV"
ElseIf BestSNR >= 40 Then
PlaySound "ns-signal-4.WAV"
ElseIf BestSNR >= 30 Then
PlaySound "ns-signal-3.WAV"
ElseIf BestSNR >= 20 Then
PlaySound "ns-signal-2.WAV"
ElseIf BestSNR >= 10 Then
PlaySound "ns-signal-1.WAV"
Else
PlaySound "ns-signal-0.WAV"
End If
Else
' Nothing seen
' PlaySound "ns-tick.WAV"
End If
End Sub

Dim GPSOk
GPSOk = True

Sub OnGPSTimeout
If GPSOk Then
GPSOk = False
PlaySound "ns-gps-err.WAV"
End If
End Sub

Sub OnGPSNoFix
If GPSOk Then
GPSOk = False
PlaySound "ns-gps-err.WAV"
End If
End Sub

Sub OnGPSPosition (Lat, Lon, Alt)
' Lat : double : Latitude, degrees east
' Lon : double : Longitude, degrees north
' Alt : double : Altitude above sea level, meters
GPSOk = True
End Sub

'Sub OnGPSSpeed (Speed)
' Speed : double : Speed, knots
'End Sub
------------------------------------------------------------------
For more info check the NS FAQ on scripting. There isn't
alot of info, but there should be enough. Write your Script
with any of the following: VB/WSH/JAVA/PERL and maybe
a few others. Whatever language is installed on your PC
can be used.

jiangjik

So is there ways which i can interface with netstumbler without using the codes? What i need is just to capture the signal strength and SNR as variables in a C Program as part of the decision making process..

Thanks!

Regards

Patrick

Madhadder

No. Using the NS scripting language is the only way.

jiangjik

hi, given the NS scripting language, how can i capture the variables i want? I want variables like signal strength and SNR. I intend to write a C program for decision making to carry out a handover.. but how can i use the scriptiing? It seems like it not a program to me. Forgive me for being ignorance in the question. But i really have no idea how i can use the scripting with the C program i intend to write.

Please advice me thank you!

Regards

Patrick