i have to implement push notification in my project.
It has sender(windows phone window application),wcf service and client(windows phone applcation).
How can i replace the sender and use my url to send and recieve notification from client?
i want sender to be some application in emulator itself that run parallely with the client and push data continously to the client.
how to develop such application
can anyone tell the way.
It sounds as though you are looking to use two WP7 apps to send messages back and forth to one another using the push notification functionality. Is that correct?
My understanding it that you will still require a each device to subscribe to a push notification service (MS hosted) using the unique URI sent back when the subscription is successful. It appears that SL3/4 can create HttpWebRequest objects and therefore should be able to formulate a correct package to send, however, the difficulty as I see it will be how to obtain the URI of the device you want to send the post to. Normally the post is sent to the subscriber, which knows its on URI as it was returned during the subscribing phase.
My WCF hosted code only works if the WCF knows the URI of the device, which is sent when the WCF method is called:
public bool sendTileUpdate(string tileText, string url, string image)
{
string TilePushXML = "<?xml version=\"1.0\" encoding=\"utf-8\"?>" +
"<wp:Notification xmlns:wp=\"WPNotification\">" +
"<wp:Tile>" +
"<wp:BackgroundImage>{2}</wp:BackgroundImage>" +
"<wp:Count>{0}</wp:Count>" +
"<wp:Title>{1}</wp:Title>" +
"</wp:Tile>" +
"</wp:Notification>";
try
{
HttpWebRequest sendNotificationRequest = (HttpWebRequest)WebRequest.Create(url);
sendNotificationRequest.Method = "POST";
sendNotificationRequest.Headers = new WebHeaderCollection();
sendNotificationRequest.ContentType = "text/xml";
// Tile
sendNotificationRequest.Headers.Add("X-WindowsPhone-Target", "token");
sendNotificationRequest.Headers.Add("X-NotificationClass", "1");
string str = string.Format(TilePushXML, "", tileText, image);
byte[] strBytes = new UTF8Encoding().GetBytes(str);
sendNotificationRequest.ContentLength = strBytes.Length;
using (Stream requestStream = sendNotificationRequest.GetRequestStream())
{
requestStream.Write(strBytes, 0, strBytes.Length);
}
HttpWebResponse response = (HttpWebResponse)sendNotificationRequest.GetResponse();
string notificationStatus = response.Headers["X-NotificationStatus"];
string deviceConnectionStatus = response.Headers["X-DeviceConnectionStatus"];
return true;
}
catch (Exception e)
{
return false;
}
}
I know this is a TileNotification, but the principles are the same.
I understand that Mango (WP7.1 & SL4) will support sockets and this might be a more appropriate way for your devices to communicate!
Good luck,
Jason.
Related
I am working on Windows Service in visual studio 2017. In the rest api's call, getting exceptions while debugging code. Sometimes first 2 3 calls working after that getting exceptions.
System.Net.WebException: 'The remote server returned an error: (503)
Server Unavailable.'
The remote server returned an error: (429)
Unable to connect to the remote server
When calling same api's from Postman, getting response successfully.
This is my code
private void timer1_Tick(object sender, ElapsedEventArgs e)
{
WriteToFile("timer1_Tick method called..");
try
{
string jsonString = "";
string jsonstring2 = "";
string prodfetchurl = HOST;
var req = WebRequest.Create(prodfetchurl) as HttpWebRequest;
req.Method = "GET";
InitializeRequest(req);
req.Accept = MIME_TYPE;
//System.Threading.Thread.Sleep(5000);
var response = (HttpWebResponse)req.GetResponse();
WriteToFile("First service called...");
if (response.StatusCode == HttpStatusCode.OK)
{
Stream responseStream = response.GetResponseStream();
StreamReader responseReader = new StreamReader(responseStream);
jsonString = responseReader.ReadToEnd();
}
var deserialsseobj = JsonConvert.DeserializeObject<ProductList>(jsonString).Products.Where(i => i.Failed > 0).ToList();
foreach (var a in deserialsseobj)
{
var pid = a.ID;
string url = FailedDevicesUrl + pid.Value + "/failed";
var req2 = WebRequest.Create(url) as HttpWebRequest;
req2.Method = "GET";
InitializeRequest(req2);
req2.Timeout = 300000;
req2.Accept = MIME_TYPE;
var response1 = (HttpWebResponse)req2.GetResponse();
Stream responsestream2 = response1.GetResponseStream();
WriteToFile("Second service called...");
if (response1.StatusCode == HttpStatusCode.OK)
{
StreamReader responsereader1 = new StreamReader(responsestream2);
jsonstring2 = responsereader1.ReadToEnd();
}
var output = JsonConvert.DeserializeObject<List<FailedDeviceList>>(jsonstring2); // Will get List of the Failed devices
List<int> deviceids = new List<int>();
Reprocessdata reproc = new Reprocessdata();
Reprocessdata.DeviceId rprod = new Reprocessdata.DeviceId();
reproc.ForceFlag = true;
reproc.ProductID = pid.Value;
foreach (var dd in output)
{
rprod.ID = dd.DeviceId;
reproc.DeviceIds.Add(rprod);
}
// Reprocess the Product in Devices
var req3 = WebRequest.Create(ReprocessUrl) as HttpWebRequest;
req3.Method = "POST";
InitializeRequest(req3);
req3.Accept = MIME_TYPE;
req3.Timeout = 300000;
req3.ContentType = "application/json";
using (StreamWriter writer = new StreamWriter(req3.GetRequestStream()))
{
string json = new JavaScriptSerializer().Serialize(reproc);
writer.Write(json);
writer.Close();
}
System.Threading.Thread.Sleep(5000);
var response5 = (HttpWebResponse)req3.GetResponse();
WriteToFile("Third service called...");
if (response5.StatusCode == HttpStatusCode.OK)
{
string result;
using (StreamReader rdr = new StreamReader(response5.GetResponseStream()))
{
result = rdr.ReadToEnd();
}
}
}
response.Close();
}
catch (Exception ex)
{
WriteToFile("Simple Service Error on: {0} " + ex.Message + ex.StackTrace);
}
}
Methods used in above code
protected override void OnStart(string[] args)
{
base.OnStart(args);
timer1 = new System.Timers.Timer();
timer1.Interval = 60000; //every 1 min
timer1.Elapsed += new System.Timers.ElapsedEventHandler(timer1_Tick);
timer1.Enabled = true;
WriteToFile("Service has started..");
}
public void InitializeRequest(HttpWebRequest request)
{
request.Headers.Add("aw-tenant-code", API_TENANT_CODE);
request.Credentials = new NetworkCredential(USER_NAME, PASSWORD);
request.KeepAlive = false;
request.AddRange(1024);
}
When I contacted service provide they said everything fine from there side. Is this my code is buggy or windows service not reliable? How can I fix this issue?
Note: All APIS are working fine from Angular application using Visual Studio Code. It means my code is not working.
Edit1: Three below services I am using from this document of VMware.
private const string HOST = "https:host/api/mdm/products/search?";
private const string FailedDevicesUrl = "https:host/api/mdm/products/";
private const string ReprocessUrl = "https:host/api/mdm/products/reprocessProduct";
Response http code 429 indicates that you sending too many requests on target web service.
This means service you trying to send requests has a policies that blocks some requests by request-per-time limit.
Also I admit that external service can be manually configured to throw 403 code in specific cases that you can't know about. If that, this information can be explained in external service documentation... or not :)
What you can do with this?
Fit in limitations
You can make detailed research what limits target webservice has and set up your code to fit in this limitations. For example if service has limitation for receiving only one request per 10 minutes - you must set up your timer to send one request each 10 or more minutes. If documentation not provide such information - you can test it manually by finding some patterns with external service responses.
Use proxy
Every limitation policy based on information about requests senders. Usually this information consists of IP address of sender only. This means if you send 2 requests from two different IP addresses - limitation policy will perceive that like 2 different computers sending these requests. So you can find/buy/rent some proxy IP addresses and send requests through there on target web server.
How to connect through proxy in C# using WebRequest you can see in this answer.
Negotiate with external service provider
If you have possibility to communicate with external service developers or help center, you can ask their to reduce limitations for your IP address (if it static) or provide some mechanisms to avoid limitation policy for you. If for some reason they cannot provide this opportunity, at least you can ask detailed information about limitations.
Repetition mechanism
Some times 503 error code that is outer exception you received may be caused by service unavailable. It means that server can be under maintenance or temporary overloaded. So you can write repetition mechanism to make continious sending requests to server until it'll be accessible.
Polly library may help you with repetition mechanism creation
The inner error of that 503 is:
The remote server returned an error: (429)
HTTP 429 indicates too many requests. Maybe your upstream server can’t process all requests sent.
This can happen when you reached rate limiting / throttling value if you’re calling a third party API.
UPDATE
As per page 28 in the API docs, you could configure throttling when creating a new API. Check if the throttling is too small or maybe turn off the throttling and see if that could fix the error?
I'd like to connect if my Arduino is available on the network. I'm trying to access the Arduino web server using an HTTP client and processing the JSON answer.
Since ping is not available in UWP what are my options? (see: Article)
One option would be to handle the exception of the HTTP client. But is there any more elegant way to check the connection before requesting the JSON data?
One method might be using the HTTPClient to do a GetAsync() and check the Status code coming out of it.
Depending on your time constraints, you can wait for it to time out naturally or pass a cancellation token to break it sooner than the defaults.
From here https://learn.microsoft.com/en-us/windows/uwp/networking/httpclient (slightly modified):
//Send the GET request asynchronously and retrieve the response as a string.
Windows.Web.Http.HttpResponseMessage httpResponse = new Windows.Web.Http.HttpResponseMessage();
string httpResponseBody = "";
try
{
//Send the GET request
httpResponse = await httpClient.GetAsync(requestUri);
if(httpResponse.IsSuccessStatusCode) { /* Do something with it */ }
else { /* Do fallback here */ }
}
catch (Exception ex)
{
httpResponseBody = "Error: " + ex.HResult.ToString("X") + " Message: " + ex.Message;
}
I am working on an android application which uses push notification service by GCM. Currently I am stuck at creating a server. The guides provided by the GCM documentation is in java which I have no idea how to implement. After researching for awhile, I found GCMSharp on github which uses C#
PushSharp - https://github.com/Redth/PushSharp
But as of now, I am new to creating a server and have no idea how to get started. Is the server actually a web service that keeps listening to request and upon getting a request directs it to the GCM which pushes notification to the client phone?
And if yes, do I implement it in a webservice such as WCF?
You could follow this tutorial.
Is the server actually a web service that keeps listening to request
and upon getting a request directs it to the GCM which pushes
notification to the client phone?
You don't need to listen to requests. GCM Push directly pushes any message to the device without any request. For more details, Read this documentation.
I have answered to this on another thread and here i am repeating. Code looks bit longer but it works. I just sent a push notification to my phone after struggling 2 days by implementing the following code in C# project. I referred a link regarding this implementation, But couldn't find it to post here. So will share my code with you. If you want to test the Notification online you may visit to this link.
note : I have hardcorded apiKey, deviceId and postData, please pass
the apiKey,deviceId and postData in your request and remove them from
the method body. If you want pass message string also
public string SendGCMNotification(string apiKey, string deviceId, string postData)
{
string postDataContentType = "application/json";
apiKey = "AIzaSyC13...PhtPvBj1Blihv_J4"; // hardcorded
deviceId = "da5azdfZ0hc:APA91bGM...t8uH"; // hardcorded
string message = "Your text";
string tickerText = "example test GCM";
string contentTitle = "content title GCM";
postData =
"{ \"registration_ids\": [ \"" + deviceId + "\" ], " +
"\"data\": {\"tickerText\":\"" + tickerText + "\", " +
"\"contentTitle\":\"" + contentTitle + "\", " +
"\"message\": \"" + message + "\"}}";
ServicePointManager.ServerCertificateValidationCallback += new RemoteCertificateValidationCallback(ValidateServerCertificate);
//
// MESSAGE CONTENT
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
//
// CREATE REQUEST
HttpWebRequest Request = (HttpWebRequest)WebRequest.Create("https://android.googleapis.com/gcm/send");
Request.Method = "POST";
Request.KeepAlive = false;
Request.ContentType = postDataContentType;
Request.Headers.Add(string.Format("Authorization: key={0}", apiKey));
Request.ContentLength = byteArray.Length;
Stream dataStream = Request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
//
// SEND MESSAGE
try
{
WebResponse Response = Request.GetResponse();
HttpStatusCode ResponseCode = ((HttpWebResponse)Response).StatusCode;
if (ResponseCode.Equals(HttpStatusCode.Unauthorized) || ResponseCode.Equals(HttpStatusCode.Forbidden))
{
var text = "Unauthorized - need new token";
}
else if (!ResponseCode.Equals(HttpStatusCode.OK))
{
var text = "Response from web service isn't OK";
}
StreamReader Reader = new StreamReader(Response.GetResponseStream());
string responseLine = Reader.ReadToEnd();
Reader.Close();
return responseLine;
}
catch (Exception e)
{
}
return "error";
}
public static bool ValidateServerCertificate(
object sender,
X509Certificate certificate,
X509Chain chain,
SslPolicyErrors sslPolicyErrors)
{
return true;
}
You may not familiar with words like apiKey, deviceId. Dont worry i will explain what are they and how to create those.
apiKey What & why :This a key that will be used when sending requests to GCM server. How to create : Refer this post
deviceId What & why : This id also known as RegistrationId. This is a unique id to identify the device. When you want to send a
notification to a specific device you need this id. How to
create: This depends on how you implement the application. For cordova
i used a simple pushNotification Plugin You can simply create a
deviceId/RegistrationId using this plugin. To do that you need to have
a senderId. Google how to create a senderId it is really simple =)
If anyone needs some help leave a comment.
Happy Coding.
-Charitha-
I am trying to get EWS's push notifications set up in my c# app.
After getting the response from the server and reading it using a NetworkStream I need to respond to the server with Ok in a SOAP message. The only example that I can find uses Microsoft.Web.Services3 and a SoapEnvelope. My understanding is that this has now been replaced by WCF and I really want to use the newer technologies (to learn them).
How would I go by sending a SOAP message back to the server, presumably using the same NetworkStream that I get the notification on?
Here is some code that I tried, but it fails for some reason.
const string RESPONSE_OK = "<?xml version=\"1.0\" encoding=\"utf-8\"?><soap:Envelope xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope\"><soap:Body>" +
"<SendNotificationResult xmlns=\"http://schemas.microsoft.com/exchange/services/2006/messages\">" +
"<SubscriptionStatus>OK</SubscriptionStatus></SendNotificationResult></soap:Body></soap:Envelope>";
responseBytes = encoding.GetBytes(RESPONSE_OK);
// Send the result
HTTPResponseStruct _httpResponse;
_httpResponse.version = "HTTP/1.1";
_httpResponse.BodyData = responseBytes;
_httpResponse.Headers = new Hashtable();
_httpResponse.Headers.Add("Server", "IT12");
_httpResponse.Headers.Add("Date", DateTime.Now.ToString("r"));
_httpResponse.Headers.Add("Content-Type", "text/xml; charset=utf-8");
_httpResponse.Headers.Add("Content-Length", _httpResponse.BodyData.Length);
_httpResponse.Headers.Add("Connection", "close");
string HeadersString = _httpResponse.version + " "
+ "200 OK" + "\r\n";
foreach (DictionaryEntry Header in _httpResponse.Headers)
{
HeadersString += Header.Key + ": " + Header.Value + "\r\n";
}
HeadersString += "\r\n";
byte[] bHeadersString = Encoding.ASCII.GetBytes(HeadersString);
// Send headers
clientStream.Write(bHeadersString, 0, bHeadersString.Length);
// Send body
if (_httpResponse.BodyData != null)
clientStream.Write(_httpResponse.BodyData, 0,
_httpResponse.BodyData.Length);
// clientStream.Write(responseBytes, 0, responseBytes.Length);
clientStream.Flush();
Thanks,
Pieter
you can use Microsoft.Exchange.WebServices.Data (EWS Managed API Reference)
http://msdn.microsoft.com/en-us/library/dd633710%28v=EXCHG.80%29.aspx
You marked the other answer as "accepted" but the link you are referring to talks about streaming subscriptions. These are only available for Exchange 2010 and later. For those who are stuck with Exchange Server 2007, there is a Push-Notification library on CodePlex.
I am writing a program. my program receive data from a server through HTTP protocol. the data will be pushed by server to my program.
I tried to use WebRequest, but only received one session of data.
How can i keep the connection alive, to receive the data from server continuosly,
Any help is appreciated.
the following is the SDK document:
Under the authorization of GUEST or ADMIN, it is possible to get the series of live images
(Server push). To get the images, send the request to “/liveimg.cgi?serverpush=1” as shown
in the Figure. 2-1-1.
When the camera receives the above request from the client, it sends the return as shown
in the Figure. 2-2.
Each JPEG data is separated by “--myboundary”, and “image/jpeg” is returned as
“Content-Type” header, after “--myboundary”. For “Content-Length” header, it returns the
number of bytes in the --myboundary data (excluding “--myboundary”, each header, and
\r\n as delimiter). After the “Content-Length” header and “\r\n” (delimiter), the actual
data will be sent.
This data transmission will continue until the client stop the connection (disconnect), or
some network error occurs.
int len;
string uri = #"http://192.168.0.2/liveimg.cgi?serverpush=1";
HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(uri);
req.Credentials = new NetworkCredential("admin", "admin");
req.KeepAlive = true;
string line = "";
HttpWebResponse reply = (HttpWebResponse)req.GetResponse();
Stream stream = reply.GetResponseStream();
System.Diagnostics.Debug.WriteLine(reply.ContentType);
StreamReader reader = new StreamReader(stream);
do
{
line = reader.ReadLine();
System.Diagnostics.Debug.WriteLine(line);
System.Threading.Thread.Sleep(300);
} while (line.Length>0);
You can keep an HTTP connection open for an extended period of time, if the server supports doing so. (As already mentioned, this will significantly limit the number of simultaneous users you can support.)
The server will need to be set Response.Buffer=false, and have an extended ScriptTimeout (I'm assuming your using ASP.NET on the server side). Once you do that, your page can keep sending Response.Write data as needed until whatever it is doing is done.
Your client will need to process the incoming Response before the connection is complete rather than blocking for the complete response.
You may want to take a look at StreamHub Push Server - its a popular Comet server and has an .NET Client SDK which allows you to receive real-time push updates in C# (or VB / C++).
If I'm understanding you correctly, your server is going to respond to some event by sending data to your client outside of the client making a request/response. Is this correct? If so, I wouldn't recommend trying to keep the connection open unless you have a very small number of clients -- there are a limited number of connections available, so keeping them open may rapidly result in an exception.
Probably the easiest solution would be to have the clients poll periodically for new data. This would allow you to use a simple server and you'd only have to code a thread on the client to request any changes or new work once every minute or thirty seconds or whatever your optimal time period is.
If you truly want to have the server notify the clients proactively, without them polling, then you'll have to do something other than a simple web server -- and you'll also have to code and configure the client to accept incoming requests. This may be difficult if your clients are running behind firewalls and such. If you go this route, WCF is probably your best choice, as it will allow you to configure server and client appropriately.
You need to get a cookie from IP cam and include that cookie in header of your next HttpWebRequest. Otherways it will always try to redirect you to "index.html".
Here is how you can do it...
BitmapObject is a class that serves as a container for Jpeg image, current date and eventual error text. Once a connection is established it will pool an image every 200 ms. Same should be applicable for continuous image stream obtained through "serverpush".
public void Connect()
{
try
{
request = (HttpWebRequest)WebRequest.Create("Http://192.168.0.2/index.html");
request.Credentials = new NetworkCredential(UserName,Password);
request.Method = "GET";
response = (HttpWebResponse)request.GetResponse();
WebHeaderCollection headers = response.Headers;
Cookie = headers["Set-Cookie"];//get cookie
GetImage(null);
}
catch (Exception ex)
{
BitmapObject bitmap = new BitmapObject(Properties.Resources.Off,DateTime.Now);
bitmap.Error = ex.Message;
onImageReady(bitmap);
}
}
private Stream GetStream()
{
Stream s = null;
try
{
request = (HttpWebRequest)WebRequest.Create("http://192.168.0.2/liveimg.cgi");
if (!Anonimous)
request.Credentials = new NetworkCredential(UserName, Password);
request.Method = "GET";
request.KeepAlive = KeepAlive;
request.Headers.Add(HttpRequestHeader.Cookie, Cookie);
response = (HttpWebResponse)request.GetResponse();
s = response.GetResponseStream();
}
catch (Exception ex)
{
BitmapObject bitmap = new BitmapObject(Properties.Resources.Off,DateTime.Now);
bitmap.Error = ex.Message;
onImageReady(bitmap);
}
return s;
}
public void GetImage(Object o)
{
BitmapObject bitmap = null;
stream = GetStream();
DateTime CurrTime = DateTime.Now;
try
{
bitmap = new BitmapObject(new Bitmap(stream),CurrTime);
if (timer == null)//System.Threading.Timer
timer = new Timer(new TimerCallback(GetImage), null, 200, 200);
}
catch (Exception ex)
{
bitmap = new BitmapObject(Properties.Resources.Off, CurrTime);
bitmap.Error = ex.Message;
}
finally
{
stream.Flush();
stream.Close();
}
onImageReady(bitmap);
}
If you are using a standard web server, it will never push anything to you - your client will have to periodically pull from it instead.
To really get server push data you have to build such server yourself.