I have a Python script that runs fine on boot to detect the status of a wifi connection and write an HTML IMG tag to file dependent on the script result.
I want this to run "constantly" and I know this can be acheived by using a CRON job but the most frequent running of the script would be 1 min and I would like to know within seconds of the result changing.
I have tried many variations of the bellow code but it dosen't ever seem to run. (I remove the WiFi dongle and it should change. If I remove it and reboot the correct result is displayed.)
PYTHON:
import time, urllib2
def internet_on():
try:
response=urllib2.urlopen('http://64.233.160.94',timeout=1)
return '<img class="right" src="networkon.png" width="32" height="32">'
except urllib2.URLError as err: pass
return '<img class="right" src="networkoff.png" width="32" height="32">'
output = internet_on()
f = open('/var/www/html/viv/wifiout.html', 'w')
print >> f, output
f.close()
time.sleep(1)
while True:
internet_on()
HTML:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Vivarium Enviroment Control Centre</title>
<link rel="stylesheet" href="style.css">
<script src="https://code.jquery.com/jquery-1.12.0.min.js"></script>
<script type="text/javascript">
function updateTime() {
var currentTime = new Date();
var hours = currentTime.getHours();
var minutes = currentTime.getMinutes();
var seconds = currentTime.getSeconds();
if (minutes < 10){
minutes = "0" + minutes;
}
if (seconds < 10){
seconds = "0" + seconds;
}
var v = hours + ":" + minutes + ":" + seconds + " ";
if(hours > 11){
v+="PM";
} else {
v+="AM"
}
setTimeout("updateTime()",1000);
document.getElementById('time').innerHTML=v;
}
$("document").ready(function(){
updateTime();
setInterval(function(){
$("#wifi").load('wifiout.html');
},1000);
});
function changeStatus() {
var image = document.getElementById('lightStatus');
if (image.src.match("lightoff")) {
image.src = "lighton.png";
} else {
image.src = "lightoff.png";
}
}
</script>
</head>
<body>
<div id="topbar">
<span id="time"></span>
<span id="wifi"></span>
<img id="lightStatus" class="right" onclick="changeStatus()" src="lightoff.png" width="32" height="32">
</div>
</body>
</html>
ERROR THROWN AFTER RUNNING FOR A WHILE APPLYING THE ACCEPTED ANSWER
pi@Vivarium:~ $ sudo python /home/pi/Desktop/wifi.py Traceback (most recent call last): File "/home/pi/Desktop/wifi.py", line 17, in internet_on() File "/home/pi/Desktop/wifi.py", line 8, in internet_on urllib2.urlopen('http://64.233.160.94',timeout=1) File "/usr/lib/python2.7/urllib2.py", line 154, in urlopen return opener.open(url, data, timeout) File "/usr/lib/python2.7/urllib2.py", line 437, in open response = meth(req, response) File "/usr/lib/python2.7/urllib2.py", line 550, in http_response 'http', request, response, code, msg, hdrs) File "/usr/lib/python2.7/urllib2.py", line 469, in error result = self._call_chain(*args) File "/usr/lib/python2.7/urllib2.py", line 409, in _call_chain result = func(*args) File "/usr/lib/python2.7/urllib2.py", line 656, in http_error_302 return self.parent.open(new, timeout=req.timeout) File "/usr/lib/python2.7/urllib2.py", line 437, in open response = meth(req, response) File "/usr/lib/python2.7/urllib2.py", line 550, in http_response 'http', request, response, code, msg, hdrs) File "/usr/lib/python2.7/urllib2.py", line 469, in error result = self._call_chain(*args) File "/usr/lib/python2.7/urllib2.py", line 409, in _call_chain result = func(*args) File "/usr/lib/python2.7/urllib2.py", line 656, in http_error_302 return self.parent.open(new, timeout=req.timeout) File "/usr/lib/python2.7/urllib2.py", line 431, in open response = self._open(req, data) File "/usr/lib/python2.7/urllib2.py", line 449, in _open '_open', req) File "/usr/lib/python2.7/urllib2.py", line 409, in _call_chain result = func(*args) File "/usr/lib/python2.7/urllib2.py", line 1227, in http_open return self.do_open(httplib.HTTPConnection, req) File "/usr/lib/python2.7/urllib2.py", line 1200, in do_open r = h.getresponse(buffering=True) File "/usr/lib/python2.7/httplib.py", line 1073, in getresponse response.begin() File "/usr/lib/python2.7/httplib.py", line 415, in begin version, status, reason = self._read_status() File "/usr/lib/python2.7/httplib.py", line 371, in _read_status line = self.fp.readline(_MAXLINE + 1) File "/usr/lib/python2.7/socket.py", line 476, in readline data = self._sock.recv(self._rbufsize) socket.timeout: timed out