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Hello all,I have ported the software to a wireless embedded ARM system, and I am trying to figure out where to add some wireless link quality checking. Since it is feasible that the embedded system could roam out of range of the wireless access point, i need to warn the user when it happens. I have working code for it, but i need a good place to put it that wont tax my system. The way I am checking the link is by opening a read pipe and running a small binary like ifconfig that will give me the link quality. I grep out the data i want then sscanf it. It really bogs the system down if I do this too much (i tried doing it on each stream_get_byte, but that was a BAD idea... ).
Anybody have any ideas on where to put this check? Code snippet follows: //Begin RF Link check FILE *rd_pipe; char output[256]; int result; int linkQnum=0; int linkQden=0; int sigL=0; int noiseL=0; memset(output, 0x00, sizeof(output));if((rd_pipe = popen("iwconfig wlan0 2> /dev/null | grep Link", "r")) == (FILE *)NULL)
midrange.com
{
// some error msg
}
result = fread(output,1,sizeof(output), rd_pipe);
pclose(rd_pipe);
sscanf(output, " Link Quality:%d/%d Signal level:-%d dBm
Noise level:-%d dBm",
&linkQnum, &linkQden, &sigL, &noiseL); //End RF Link check Thanks, Brian
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