G
Guest
For Paul Tobe
Hi Paul. We have tried RFUtils the last month now on a Pocket PC Ipaq 4150 with built in wireless LAN. We have found that RFUtils works great with this Wi-Fi device, however this device only updates the list of available SSIDs at a 10 second interval, which is insufficient for indoor location positioning using wi-fi technology. Therefore we have tried to replace the internal wi-fi lan with a Sandisk SD wi-fi lan card, that updates the list of SSIDs every 2 seconds.
If we understand the NDIS correctly, the RFUtils should be able to retrieve all the information about SignalStrenght, SSIDs, HWaddress for this device aswell. We have run into a problem when retrieving the SSIDs from the adapter, that yield the following exception, that is likely to occur after 3 refreshes of the SSIDSList
A manged ArgumentOutOfRangeException occurred at Application::Run+0x
Application::Run+0x
Form1::Main+0x
When debuggin we found that this error occurs when public String SSID class is used in RFUtils
public String SSI
get
{
// Get the string length from the first four bytes
int c = BitConverter.ToInt32( data, offset + SsidOffset )
// Convert the rest of the SSID stuff to a string
EXCEPTION HERE -- > return System.Text.Encoding.ASCII.GetString( data, offset + SsidOffset + 4, c )
It seems that the lenght of the integer C gets sufficiently large, so that when doing the ASCII encoding we get an exception
Moreover sometimes it lists a signalstrenght -100 in the SSIDsForm, but no BSSID is shown. At other times both the SignalStrenght and the SSID equals "" <-- nothing. Sometimes the data array of bytes has a lenght of more than 46000, which seems kind of many. The errors are most likely to occur when the adapter can see more than 2 accesspoints
We have tried to use two other programs to retrieve the list of SSIDS, The Cirond Software also have problems finding the list of AccessPoints, and sometimes show extremely large numbers in recieved signal strenght from an accesspoint i.e. -4668900.
When using the built in software for identifying networks in pocket PC 2003 no problems were encountered
I guess our question is, Why does the built in software of the pocket PC 2003 work correctly? Whys doesnt NDIS work with this network adapter
Regard
Mikkel Andreasen & Anders Fredbor
Hi Paul. We have tried RFUtils the last month now on a Pocket PC Ipaq 4150 with built in wireless LAN. We have found that RFUtils works great with this Wi-Fi device, however this device only updates the list of available SSIDs at a 10 second interval, which is insufficient for indoor location positioning using wi-fi technology. Therefore we have tried to replace the internal wi-fi lan with a Sandisk SD wi-fi lan card, that updates the list of SSIDs every 2 seconds.
If we understand the NDIS correctly, the RFUtils should be able to retrieve all the information about SignalStrenght, SSIDs, HWaddress for this device aswell. We have run into a problem when retrieving the SSIDs from the adapter, that yield the following exception, that is likely to occur after 3 refreshes of the SSIDSList
A manged ArgumentOutOfRangeException occurred at Application::Run+0x
Application::Run+0x
Form1::Main+0x
When debuggin we found that this error occurs when public String SSID class is used in RFUtils
public String SSI
get
{
// Get the string length from the first four bytes
int c = BitConverter.ToInt32( data, offset + SsidOffset )
// Convert the rest of the SSID stuff to a string
EXCEPTION HERE -- > return System.Text.Encoding.ASCII.GetString( data, offset + SsidOffset + 4, c )
It seems that the lenght of the integer C gets sufficiently large, so that when doing the ASCII encoding we get an exception
Moreover sometimes it lists a signalstrenght -100 in the SSIDsForm, but no BSSID is shown. At other times both the SignalStrenght and the SSID equals "" <-- nothing. Sometimes the data array of bytes has a lenght of more than 46000, which seems kind of many. The errors are most likely to occur when the adapter can see more than 2 accesspoints
We have tried to use two other programs to retrieve the list of SSIDS, The Cirond Software also have problems finding the list of AccessPoints, and sometimes show extremely large numbers in recieved signal strenght from an accesspoint i.e. -4668900.
When using the built in software for identifying networks in pocket PC 2003 no problems were encountered
I guess our question is, Why does the built in software of the pocket PC 2003 work correctly? Whys doesnt NDIS work with this network adapter
Regard
Mikkel Andreasen & Anders Fredbor