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My teenage step-daughter is autistic, and tends to want to run away from school, leisure-club and sometimes even from home. This is very bad for her safety, and a great concern for us.
I am looking for a way to track her, so we can find her again when she runs away.
Here is my ideal (possibly unrealistic) scenario:
Tiny GPS device with GSM/GPRS
Can be woken up via sms when needed (so battery will last longer)
When activated, spins up GPS + Data connection and starts hitting a predefined URL with device ID and long+lat every 15 seconds
Battery life 7 days on standby (ie. when never activated)
Can be disabled put back to sleep via sms
I have googled and researched this for a while, but have yet to find a device that fits these requirements.
The solution could also be a mobile phone of some sort, that I can lock down.
You could do most of that with any Android handset using prey
http://preyproject.com/blog/2010/01/prey-arrives-on-mobiles-android-version-available
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Is GPS data signed and timestamped by the satellite?
No, GPS is not signed. I think there may be in future some signed signals. Maybe it is used on military part of GPS.
GPS spoofing is a well know problem, and problems are usually "solved" in hardware. If signal strength on some satellites changes quickly: do no trust it. Multiple antenna (on extreme of lorry/ship) and comparing strength of signal helps. Some directional antenna helps to know that signal expected from a satellite come from where it is expected. And often some gyroscope, compass, or and tracking, to check plausibility of data.
Note: fishing boat uses it to decoy own position (in protected area/economic exclusive zones). They causes a lot of troubles to other ships and boats (and sometime to ground equipment).
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IPad is able to receive push messages while it has screen turned off.
Is it possible to receive push messages with WinRT device in sleep mode?
I would guess it is not possible with Intel based pro models...
Note. This is quite important issue when planning for Windows RT applications. Chat application could be made if somekind of alert could be given to user. Pro models can run real Windows Desktop apps, which can alert user when running at backround...
based on this whitepaper http://www.microsoft.com/en-us/download/details.aspx?id=30703 and what i have read before, there is a connected standby..
the whitepaper talks about background tasks working as should. no mention of notifications per say but i'd imagine they should be work as well. Apps however will be in suspended state at that point
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I'm trying to implement a socket listener in Windows Phone 7.1, which should process the incoming data and make some actions based on it (constantly, without interrupting). As far as I've found this, the info described there confused a lot, so these are the questions:
Is there some ability for the background agent to be run constantly, without interrupting by the system (or with acceptable amount of running time, more than 10 minutes)?
Is there any API to communicate with running agent, something like Android's AIDL?
PS. I cannot use Push Notifications.
No, background agents cannot run constantly. If you need code to execute constantly then you should keep the app running, maybe enable running under lock screen if appropriate.
No, you cannot connect to an agent.
Agents are not like services.
Your sockets requirement sounds like you will run into the same problem presented by this question: Windows Phone 7 (Mango) App gets disconnected when put in background?
PeriodTask is only executed every 30 minutes or so and thus cannot maintain a socket connection. You might want to look into running under the lock screen, as per Matt's answer, or perhaps ResourceIntensiveTask which can run for as long as you want for 10 minutes but only while the phone is connected to power and the phone has > 90% battery.
There is no API to communicate between the two but applications and their tasks share isolated storage, including databases.
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I'm thinking about making some apps for phones. For the sake of this discussion say it's a generic Yet Another Zombie Shooter game, for Android, iPhone, Blackberry, or OVI Market. It is a kind of casual game that the customer would fire up while in boring class in school or waiting for a bus to come in. Let's also say that the game basically doesn't cost me anything to make, because I have a day job, and I make these apps in my free time.
The question is, how much to charge for this kind of app. I'd be perfectly happy with $0.99 price tag, but as I've read some articles about this on the 'net, they say that people see product's quality reflected in the price, so they'd consider $0.99 game inferior to $2.99 game. Something called a Perceived value pricing.
To summarize this, some profits would be nice, but I'm not aiming to rake what I can from the customers. But on the other side, I also don't want to release the software for free, a little extra money always come in handy.
P.S. I've read Joel's Camels and Rubber Duckies, but this is a different type of market.
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The company I work with currently has 10 windows boxes running various in house scripts, however occasionally one goes down and no one notices for periods of up to 24 hours because the data that is manufactured is only gathered on weekly intervals. Does anyone know of a management system that will notify when a box goes down and possibly shoot uptime and response statistics back to a web management system on a linux box?
There are many.
I use Nagios for monitoring Windows and Linux servers. You might also look into Zenoss. Both are open source.
http://www.pingdom.com/ is simple to use and you get a 30 day trial - 9.95 a month gets you a lot if you decide to sign on. have it for all my apps
I would have a bash script call ping on the machines and email me (or whomever is responsible) when a box goes down.
I've seen IPMonitor in use, and it is a very good tool (but expensive). Nagios is a free alternative, and it's supposed to be quite good, but I've never used it myself.
I know nmap has a way of showing you the machine's uptime when you use the OS fingerprinting option.