#!/usr/bin/perl $debug = 0; BEGIN {push @INC, '/www/cgi-bin'}; use perlfunc; # collect some variables $node = nvram_get("node"); $node = "NOCALL" unless $node; read_query_string(); system "mkdir -p /tmp/web"; system "rm -f /tmp/web/siglevel" if $parms{start}; # get the current levels ($s, $n) = get_wifi_signal("wlan0"); if($s eq "N/A") { $s = $n = "---" } # load the previous levels if(open(FILE, "/tmp/web/siglevel")) { chomp($count = ); chomp($last_start = ); chomp($lineS = ); chomp($lineN = ); chomp($lineR = ); close(FILE); @listS = split / /, $lineS; @listN = split / /, $lineN; @listR = split / /, $lineR; push @listS, $s; push @listN, $n; if($count == 20) { shift @listS; shift @listN; shift @listR; } else { ++$count; } } else { $count = 1; @listS = ($s); @listN = ($n); $last_start = 0; } # gather statistics $good = 0; $minS = $minN = $minR = 1000; $avgS = $avgN = 0; $maxS = $maxN = $maxR = -1000; for($i = 0; $i < $count; $i++) { $s = $listS[$i]; next if $s eq "---"; ++$good; $n = $listN[$i]; $r = $s - $n; $minS = $s if $s < $minS; $minN = $n if $n < $minN; $minR = $r if $r < $minR; $maxS = $s if $s > $maxS; $maxN = $n if $n > $maxN; $maxR = $r if $r > $maxR; $avgS += $s; $avgN += $n; } if($good) { $s = $listS[-1]; $n = $listN[-1]; $r = ($s eq "---") ? "---" : $s - $n; $avgS = int($avgS / $good); $avgN = int($avgN / $good); $avgR = $avgS - $avgN; push @listR, $avgR; # make the graph if($s eq "---" or ($r >= $last_start and $r <= $last_start + 30)) { $start = $last_start; } else { $start = 10*int(($maxR + 9)/10) - 30; while($r < $start) { $start -= 10 } $start = 0 if $start < 0; } for($i = $count - 1; $i >= 0; $i--) { $str = " " x 30; if($listS[$i] ne "---") { $r2 = $listS[$i] - $listN[$i] - $start; if($r2 > 30) { $r2 = 29; substr($str, 30, 1) = ">"; } substr($str, 0, $r2 + 1) = "*" x ($r2 + 1) if $r2 >= 0; substr($str, 0, 1) = "<" if $r2 < 0; if($listR[$i] >= $start and $listR[$i] <= $start + 30) { substr($str, $listR[$i] - $start, 1) = "|"; } } push @graph, " $str\n"; } substr($graph[0], 0, 2) = ">>"; } else { $s = $n = $r = "---"; $maxS = $maxN = $maxR = "---"; $avgS = $avgN = $avgR = "---"; $minS = $minN = $minR = "---"; push @listR, "---"; $start = 0; } # store the level history open(FILE, ">/tmp/web/siglevel"); print FILE "$count\n$start\n@listS\n@listN\n@listR\n"; close(FILE); # generate the page http_header(); html_header("$node signal strength", 0); print "\n"; print "\n"; print "
\n"; print "
\n"; alert_banner(); print "

$node signal strength

\n"; print "\n"; print "\n"; print "\n"; print "\n"; print "\n"; # SNR meter print ""; print "\n"; print "\n"; print "\n"; print "\n"; print "\n"; print "\n"; print "\n"; print "\n"; print "\n"; print "\n"; print "\n"; print ""; print ""; print ""; print ""; print "\n"; print ""; print ""; print "
Signal Noise Ratio 
";
printf "%4d%10d%10d%10d\n", $start, $start + 10, $start + 20, $start + 30;
print "   | . . . . | . . . . | . . . . |\n";
print @graph;
print "
now$s $n $r 
average$avgS $avgN $avgR 
n = $good/$countmax: $maxS
min: $minS		 max: $maxN
min: $minN		 max: $maxR
min: $minR		 
 
\n"; print "
\n"; print "
\n"; show_debug_info(); show_parse_errors(); print "\n"; print "\n";