On 5/6/2010 2:17 PM, Bastian Bittorf wrote:
> * Mark Deneen <mden...@saucontech.com> [06.05.2010 17:30]:
>
>
>> Somewhat related -- Sierra Wireless cards typically speak a proprietary
>> protocol on one of the USB serial ports. I have enough of the protocol
>> implemented to read RSSI values on UMTS and CDMA cards.
>>
>> Is this something that OpenWrt is looking to include -- data card signal
>> strengths?
>>
> it would be very nice to include that in an (from user-perspective)
> hardware independant way. please post a link to your scripts and
> i will think about an interface.
>
> nbd: ATM there is no easy way to get a signal strength from
> a any/madwifi/mac80211-wifi, something like:
>
> wifi_rssi ()
> {
> local DEV="$WIFIDEV"
> local NEIGHBOUR_MAC="$1"
>
> some_driver_specific_magic()
>
> echo "$RSSI" # maybe: return $POSITIVE_INTEGER
> }
>
> or? this is also needed for GSM/UMTS-related stuff.
> how to begin?
>
> bye, Bastian
>
>
Currently, I am interfacing with the serial port through C code -- the
protocol is binary. It could be made into a program which returns the
signal strength, but I have an issue where when one serial port on the
data card is closed, the others close as well.
That is, if I have an active PPP connection and I query the signal
strength, the PPP connection is dropped. I solve this by having the
process run all of the time, and handling the error state of the file
closing on me. I am running a SVN version somewhere between 7.09 and
8.09 -- maybe the serial port issue has been resolved in backfire.
Also, a "good" RSSI value appears to be different depend on the cellular
network.
Mark
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