We have developed an application on Windows.net mobile framework and it is used on a Windows 6.5 Smartphone. for our location based application. Our application is real time and tracks our employees. We are finding that the device loses its GPS signal.
Has anyone managed to restart the GPS receiver so that it starts giving the GPS signal again. I would be ever so gratefull if someone can help. We are using GeoFramework2.0 to deliver the geographic information that you need.
Regards
Sandy
The GPS is "shut down" when no application is using it. Just close your handles and re-open them.
If the GPS on your device is part of the WWAN radio (i.e. cellular phone) it may get put in to a low power state rather than being actually shut off. In that case, you can try restarting the radio.
If that doesn't work, some GPS's will allow you to send proprietary commands to them to force a reset or clear the memory. These commands are not standard and will differ significantly by manufacturer. If you have a SiRF GPS, take a look at the SiRF Binary Protocol Reference.
Related
I have a vb.net application that is able to read gps info from gps connected to usb. This works on about 50-60 different computers and gps devices, however there is one gps device (did try it on several computers aswell) that this will not work on.
I did think there might be something wrong with the gps device, but there are two other applications (Haicom Viewer and a custom application I do not have the source code for) that works with that device without any issues. So there has to be something with my application that is not able to work with that specific device.
Currently I'm using a SerialPort control and when using Read() I get "blank" bytes and ReadLine() times out.
I have tried different BaudRates, Encodings and Hanshakes.
I managed to make it work by setting DtrEnable = True on the SerialPort control. However I do not know why that was the deciding factor. If anyone could explain why only 1 of many GPS devices needed this to be true it would be much appreciated.
I'm using code from Google's sample game "ButtonClicker2000" found here: https://github.com/playgameservices/android-basic-samples
I have 3 androids running this game in genymotion plus one on my own phone, debugging them all from android studio. I've gotten to a point where I'm trying to gracefully handle disconnect in the event of network issues. The way I'm simulating network issues is toggling the wifi on my phone. (on or off, same behavior) After that, real time messages from my phone are no longer being received by the virtual devices, and my phone is no longer receiving real time messages from the other devices. However, my phone never enters onDisconnect() and the other devices never enter onPeersDisconnected. If I exit the app on my phone after communication ceases, onPeerLeft fires on the other devices.
How can I either ensure communication between devices in a game isn't lost in the likely event that a user at some point comes in or out of range of their wifi? If that's not possible, how can I at least ensure the onDisconnect event is firing from the offending device and onPeersDisconnected event is firing on the others?
If we're going with what the documentation states, onDisconnect usually happens when there's a problem with the remote services (crash or resource problem). having the WiFi turned off doesn't look like it fits with those criteria. [onPeersDisconnected](https://developers.google.com/android/reference/com/google/android/gms/games/multiplayer/realtime/RoomStatusUpdateListener#onPeersDisconnected(com.google.android.gms.games.multiplayer.realtime.Room, java.util.List)) is called when the participants are disconnected from the room.
Determine if the onP2PConnected is called when its connected and onP2PDisconnected when disconnected (hopefully this can catch WiFi toggling cases) since I think its more appropriate when you're using real-time multiplayer.
You can also read more about it in the Real-time Multiplayer section of the documentaiton.
Hope this helps!
I'm a newbie in testing area. I have an application which has the facility to use gps and I don't have garmin tracker. I have done few tests on gps but i don't feel it's sufficient.
How to test gps manually?
What are the ways and methods to test it? please, suggest some testcases for it.
1.Need to test while traveling how the application is working with Gps connection.
2.How the Application is behaving while we got a call/Message.
3.How the Application is behaving while battery low /Automatic turn off u r phone,the current data is saved in data base properly or not
4.Need to check Battery life while using GPS
I am sure your done with smoke testing!, In that case start with Interruption testing.
Keep moving in a place, check the your GPS connectivity.
Travel to remote places where you feel the GPS can't be tracked. Check how your application responds.
Try receiving call while using the Application.
Place an alarm, check how your application responds during alarm work.
Check when your device is about to die, how the application responds. Since you'l be using GPS, chances of u'r battery drain is too high.
Check with Notification. how your application behaves.
Switch off your GPS, see if an appropriate alert is provided.
I have a Netduino Plus with at transeiver attached via SPI. I would like to reset the transiever every time the Netduino restarts. Is it possible to programmatically power on/off the 3V3 pin?
I would recommend using a FET (controlled by one of the I/O) pins to enable/disable 3V3 power to your transceiver. When you say transceiver, I think "more than a few mA" :)
BTW, we took this feedback into account with the new Shield Base module for Netduino Go. It has an integrated FET on both 3V3 and 5V power headers, so you could enable/disable power to your shield in code. Once the new Ethernet go!bus module ships and the Shield Base comes out of beta (soon), your solution can be redeployed to Netduino Go + Shield Base with few/no code changes.
Chris
Secret Labs LLC
Looking at the circuit diagram ( http://www.netduino.com/netduinoplus/schematic.pdf ), I can see only the Micro SD Card Slot having its power controlled programmatically. You could rig up a relay to control it (via a transistor, of course) instead, or if the transceiver uses less than 130mA (the current limit of the device shown: http://www.datasheetarchive.com/BSS84W-7-F-datasheet.html) you could copy the circuit from the Netduino Plus. Buying a relay shield looks like overkill, but you might have other uses for it.
Have you looked into resetting the transceiver programmatically instead of the brute-force method of power-cycling it?
Just to provide another view. You could use a transistor powered off the netduino RESET line, this will reset the device every time the netduino reboots. Or you can just link the transistor to a spare digital pin and power it in code..
What specific SPI device are you using? You mention that it's a transceiver but we could probably provide better information if we know the exact part number. If your device requires less than 8mA the Netduino Plus specs seem to indicate that one option could be using a digital output pin as the power source.
Unfortunately Secret Labs don't use exactly the language I'd expect and call out the sink and source current maximums so I would contact them directly first to see if you risk blowing your chip. I'll see if I can get an answer from them and amend this post if/when I do.
Update: Sink and source current is the same on the Netduino. See my post on their forums about sink vs. source current for a more in depth explanation. So, if your device can run off of just a few milliamps you should be able to use a digital I/O pin to power it.
Also, a lot of devices have enable pins. You can usually reset them with that line instead of pulling the power if that helps. Sometimes with flaky hardware it is better to pull the power though.
I'm trying to create an embedded outdoor display of bus arrival times at my university. I'd like the device to utilize my school's secured WiFi network to show arrival time updates determined from a server script I have running.
I was hoping to get some advice on the high-level operation of this thing -- would it be better for the display board to poll a hosted database via the WiFi network or should I have a script try to communicate with the board directly over 802.11? (Push or Pull?)
I was planning to use a Wifly or WIZnet ethernet board in combination with a wireless access hub. Mostly inspired by this project: http://www.circuitcellar.com/Wiznet/winners/001166.html Would anyone recommend something else over one of the WIZnet boards? I saw SPI/UART options and thought these boards could work with an AVR platform.
And out of curiosity -- if you were to 'cold start' this device (ie, request a bus arrival time by pushing the display's on button) you might expect it to take 10-20 seconds to get assigned an IP and successfully connect to the database, does that sound right?
I'd go pull. In fact, I'd have outdoor display make http or https requests of the server. That way the server could tell it how long to show a given set of data before polling for a new one using standard http page expiration.
I think pull would make it easier to have multiple displays, and to test your server as well. I've also got a gut feeling that this would make your display more secure. Someone would have to hack your server to hijack your display.
There's a very cool looking Arduino-targetted product called the WiShield. Seems super easy to use and he provides some source code. It uses SPI for host communication. If you're not interested in going the Arduino route, I'm sure the source code wouldn't be too hard to port to something like avr-gcc. Check it out, might save you some time and headaches for $55. Worth checking out anyway.