I usually have my home network via bluetooth tethering. It saves batteries and it is fast enough for my usual purpouses. So I have wifi OFF, but when I want to watch ie. andoid tablet on TV, my tablets know which of my TVs are open for a connection. Is there an wifi connection ON anyway. I even tested it without internet(bluetooth) and I still find open TVs, but not those that are off.
Miracast uses the device as a transmitter for WiFi Direct and doesn’t use your wireless network at all. It’s quite handy if the network is overloaded.
The device that sends the video is called the source, and the one that receives video (the TV or set top box) is called the sink. The sink pretends to be a Wifi access point. The source finds and connects to the sink’s AP as if it were connecting to a normal AP like a router. Once that connection is established, the source and sink communicate directly with each other. The home network is not involved, and the Miracast devices can communicate even if there is no home network at all.
I’m still a little confused. I have my tablet’s wifi OFF and I turn my TV ON or OFF and in two seconds my tablet knows which wireless connection is available. If I use wifi direct, it turns wifi on. But how can I see those wireless connections available, if my wifi is OFF.
If your tablet is connecting to TVs via Miracast, the wifi is on. I don’t know if your tablet works the same way, but on my Android phone, if I turn off wifi and then try to start a Miracast connection, it automatically turns wifi back on.
Before Miracasting I see wireless connections (not the TVs that are OFF). So I wonder, if there is a wifi service ON all the time. But if I turn wifi ON, my batteries don’t seem to last that long. So I think there is a service using wifi that is ON always, but it sends less and I can use my tablet a whole lot longer.
There are settings within most phones/tablets these days that allow them to find wifi networks even when you turn the wifi “off” which means the wifi isn’t really “off” so much as it is in a power-saving mode that occasionally polls for connections. I have this turned off on my phone because when I turn the wifi off I damn well want that shit to be off.
The settings are hidden a bit, but some googling with your model number and “wifi won’t stay off” should help you find it.