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Is there a way for a wireless router to send custom messages to a device on the network at regular intervals? Perhaps there is a setting that I can use that will allow me to display a message to all devices connected to my network when they view network information or something like this. I am aware that some routers have beacon features. Is there a way to add a limited amount of custom information to the beacon?

I would like to do this through my wireless router. I have not yet purchased the router so first I want to know if such a thing is possible

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Which OSes are the clients running? Are you trying to actually push a message to clients (ex: avahi/bonjour, Windows Messenger service, linux wall command, etc.)? Or simply display a welcome/login webpage for clients (similar to many public hotspots)? Please clarify. As far as purchasing goes, any router with DD-WRT firmware will allow you do some crazy and wonderful things :) –  justbrowsing Aug 15 '13 at 1:04
    
By "beacon features", do you mean beacon frames? Beacon frames are sent automatically by all wireless routers several times per second to synchronize wireless clients - they're not a way of displaying messages. –  Huskehn Aug 15 '13 at 1:07
    
@justbrowsing I do not want to display a welcome/login page. What I want is for some additional small bit of information to be appended to the beacon. –  jizco Borneo Aug 15 '13 at 1:15
    
@Huskehn So I see on wikipedia that the beacon is composed of the timestamp as well as two other components. Do either of you guys know if there a way to add anything to the beacon such as the time in which each frame was sent? –  jizco Borneo Aug 15 '13 at 1:16
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If you want to hide data in a beacon frame (ala SMS in a GSM beacon) that's fine but clients will need to run software such as wireshark to read it. Additionally un-associated "clients" in monitor mode may be able to intercept and decrypt those packets. –  justbrowsing Aug 15 '13 at 1:41
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I previously used a router - a Netgear from Sky in the UK - which I was able to setup to email me a log every morning at 07:00. Would this meet your requirement ?

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This seems close but I do not want an email. What I want is a message that is transmitted via the radio signal of the wifi so that connection to a network is not required –  jizco Borneo Aug 19 '13 at 0:20
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