Reading 802.11b/g signal strength (SNR)

Is there a set of API functions in Linux, QNX and/or Windows to read signal
strength (SNR) of the 802.11b/g ?

Luke

"Luke Andy" <(E-Mail Removed)> wrote:
>Is there a set of API functions in Linux, QNX and/or Windows to read signal
>strength (SNR) of the 802.11b/g ?

Note that "signal strength" is *not* "SNR". SNR stands for
Signal to Noise Ratio, and is expressed in dB, while signal
strength is expressed in -dBm.

--
Floyd L. Davidson <http://www.apaflo.com/floyd_davidson>
Ukpeagvik (Barrow, Alaska) (E-Mail Removed)

"Luke Andy" <(E-Mail Removed)> wrote:
> Is there a set of API functions in Linux, QNX and/or Windows to read
> signal strength (SNR) of the 802.11b/g ?

For windows, you can get this through WMI (do a search for "WMI wireless
signal strength" or something like that). I've used this on my PC based
robots, works good.

-Hoss

Hoss,

Would it be too much to ask if you could share related bits of your code
with us, so that we learn from your experience?

>> Is there a set of API functions in Linux, QNX and/or Windows to read
>> signal strength (SNR) of the 802.11b/g ?
>
> For windows, you can get this through WMI (do a search for "WMI wireless
> signal strength" or something like that). I've used this on my PC based
> robots, works good.
>
> -Hoss
>

"Luke Andy" <(E-Mail Removed)> wrote:
> Hoss,
>
> Would it be too much to ask if you could share related bits of your code
> with us, so that we learn from your experience?
>
>>> Is there a set of API functions in Linux, QNX and/or Windows to read
>>> signal strength (SNR) of the 802.11b/g ?
>>
>> For windows, you can get this through WMI (do a search for "WMI wireless
>> signal strength" or something like that). I've used this on my PC based
>> robots, works good.
>>
>> -Hoss

This is what I used in a VB6 app.

Private Sub Timer1_Timer()
Set nicset =
GetObject("winmgmts:{impersonationLevel=impersonat e}!root/wmi").InstancesOf("MSNdis_80211_ReceivedSignalStre ngth")
On Error GoTo no80211Error
For Each nic In nicset
SignalStrengthValue = Right(nic.Ndis80211ReceivedSignalStrength,
Len(nic.Ndis80211ReceivedSignalStrength) - 1)
If SignalStrengthValue <> "" Then
SendText ("S=NetSignalStrength~" & SignalStrengthValue)
End If
Exit For
Next
nicset = Nothing
Exit Sub

no80211Error:
SendToConsole "No 802.11 network adapters found"
Timer1.Enabled = False
End Sub