That's a terrible idea! DHCP doesn't work in real time - i.e. devices that are listed may no longer be connected.
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Does iOS 7 have persistent wifi?
- Thread starter CyanLite
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That's a terrible idea! DHCP doesn't work in real time - i.e. devices that are listed may no longer be connected.
wifi
Well on iOS6 if wifi sync it enabled, you will see your connection on your router all the time. The device will appear to drop wifi when asleep (*you will see 3g for a moment when you wake it) but if you watch your router connections you can see the connection still there always. When wifi sync is disabled, when the device sleeps the router will drop the connection. As soon as you wake it you will see the connection pop up on your router connections page. Again this is iOS 6 so folks with 7 need to try these options and see what happens.
Well on iOS6 if wifi sync it enabled, you will see your connection on your router all the time. The device will appear to drop wifi when asleep (*you will see 3g for a moment when you wake it) but if you watch your router connections you can see the connection still there always. When wifi sync is disabled, when the device sleeps the router will drop the connection. As soon as you wake it you will see the connection pop up on your router connections page. Again this is iOS 6 so folks with 7 need to try these options and see what happens.
hmmm well i have found it to be real time. when any device disconnects it automatically refreshses the page and shows the less devices. i may be wrong.
I can guarantee you that you are wrong.
For about a month after I sold my iPhone 4 my router still said that it was connected.
The WiFi is turned off when the phone is asleep.
You can confirm this by turning the phone on and ping it via terminal.
Put the phone to sleep, stop the ping (which seems to hold the WiFi on in my BRIEF test) and then start the ping again... No response!
QED.
Guys,
Whether this works or not depends on your Wifi network supporting WiFi sleep mode.
Most newer routers support this. The Airport Extreme and Time Capsules do, for instance. When the phone shuts off, the Wifi chipset goes into a sleep mode but remains reachable by the router.
You can test this by determining what your phone's IP is, then locking the screen. Ping the phone after a couple of minutes; you'll notice it will start pinging after a short delay. The router wakes up your phone over WiFi.
Older routers may not support this, so the phone completely disconnects and reverts to the "check for push notifications every 15 minutes" behavior. The alternative would be leaving the WiFi chipset fully on all the time, which wastes battery.
You may find that some older routers will support WiFi sleep mode if you update their firmware. I went through this mess with someone who wasn't getting timely push notifications on her iPod Touch. Once she updated the firmware on her router it started working great.
Whether this works or not depends on your Wifi network supporting WiFi sleep mode.
Most newer routers support this. The Airport Extreme and Time Capsules do, for instance. When the phone shuts off, the Wifi chipset goes into a sleep mode but remains reachable by the router.
You can test this by determining what your phone's IP is, then locking the screen. Ping the phone after a couple of minutes; you'll notice it will start pinging after a short delay. The router wakes up your phone over WiFi.
Older routers may not support this, so the phone completely disconnects and reverts to the "check for push notifications every 15 minutes" behavior. The alternative would be leaving the WiFi chipset fully on all the time, which wastes battery.
You may find that some older routers will support WiFi sleep mode if you update their firmware. I went through this mess with someone who wasn't getting timely push notifications on her iPod Touch. Once she updated the firmware on her router it started working great.
What spec is this (e.g. is it part of 802.11n) because I have never heard of this and my router is one of the best you can buy (RT-N66U) and it doesn't exhibit this behaviour.
So I have been searching the internet for days looking for an answer but I couldn't find one. So I decided to ask you guys who have it installed..
For those of you who don't know what it is, it's basically when the WiFi stays enabled when the phone is asleep and still getting notifications from apps.
iOS6 didn't have this and I assume it used data for notifications but I don't want that, I want it to use wifi
I know that things may change in the final build but I want to know how things are right now.
Thanks
I've been able to get notifications in sleep mode with a Wifi only iPad since the iPad 1.
FWIW, I don't get phone service at work and connect my phone to wifi while I'm there. The only way to get it to stay connected is by plugging it into a power source. Was like this in iOS 6 and in 7. I'd venture to guess nothing has changed unfortunately. Though, what zorinlynx posted is good to know. That might just be the issue all along.
Ah, so the phone that's not got the Wi-Fi chip on receives a message over Wi-Fi that tells it to turn on?
Can't see why that makes no sense?
So you're saying that whether or not iOS7 supports persistent wifi relies on the router it is connected to?
If so, that is unfortunate... I would rather be given the option and ensure persistent wifi on all routers.