I am doing a POC so here is the quick and dirty code. I use MQTT.fx desktop client to test Pub/Sub to my MQTT Server. Works fine. I can publish/subscribe to my topic. I can publish from another mqtt client and I get the messages. When using this code, I do not receive anything when I publish messages from MQTT.fx or any other publishers. I will receive something if I publish with the mqttClient (if you uncomment the line). I am scratching my head...
Can someone help? Thanks.
class Program
{
private static CancellationTokenSource cts = new CancellationTokenSource(); //TODO create token using the Timeout delay from config
private static async Task Main(string[] args)
{
var factory = new MqttFactory();
var mqttClient = factory.CreateMqttClient();
var options = new MqttClientOptionsBuilder()
.WithClientId("MyClientIDHere")
.WithTcpServer("IPAddressHere", 1883)
//.WithCredentials("Wbo", string.Empty)
//.WithTls()
.WithCleanSession()
.Build();
try
{
mqttClient.UseApplicationMessageReceivedHandler(async e =>
{
Console.WriteLine("### RECEIVED APPLICATION MESSAGE ###");
Console.WriteLine($"+ Topic = {e.ApplicationMessage.Topic}");
Console.WriteLine($"+ Payload = {Encoding.UTF8.GetString(e.ApplicationMessage.Payload)}");
Console.WriteLine($"+ QoS = {e.ApplicationMessage.QualityOfServiceLevel}");
Console.WriteLine($"+ Retain = {e.ApplicationMessage.Retain}");
Console.WriteLine();
});
mqttClient.UseConnectedHandler(async e =>
{
Console.WriteLine("### CONNECTED WITH SERVER ###");
// Subscribe to a topic
await mqttClient.SubscribeAsync(new TopicFilterBuilder().WithTopic("MyClientIDHere/Device_2/Instance_1").Build());
Console.WriteLine("### SUBSCRIBED ###");
});
await mqttClient.ConnectAsync(options, cts.Token);
// UNCOMMENT AND YOU WILL RECEIVE A MESSAGE Task.Run(() => mqttClient.PublishAsync("MyClientIDHere/Device_2/Instance_1","met=Temperature~data=29"));
}
catch (OperationCanceledException)
{
Console.WriteLine("task cancelled");
}
catch (Exception e)
{
Console.WriteLine(e);
}
Console.ReadKey();
}
}
With the latest version of MQTTnet I could not reproduce your issue, it seems to work here. I'm using a mosquitto MQTT server which is located on another server than where I run my program.
Your code looks good. You can improve some, by subscribing to the topics before connecting.
Related
I'm trying to track the sms delivery status of the messages I send using the bot framework. I'm using Twilio, and sending proactive messages. Right now I'm trying to do so with twilio status callbacks
This is similar to this question, I tried that approach but I couldn't get it to work. I've added my url on the TwiML app and it is not firing. I have double and triple checked, and I suspect this url is somehow ignored or not going through with my current set up. I don't get any callbacks on the proactive message nor on the replies the bot sends to the user. However the flow works fine and I can reply and get proper responses from the bot. Edit: calling this "approach 1"
approach 2: I've also tried this doing some light modifications on Twilio adapter, to be able to add my callback just before create message. (I changed it so it uses a customized client wrapper that adds my callback url when creating the twilio resource) This does work, partially: when I reply a message from my bot, I get the status callbacks. But as the proactive message is sent using the default adapter, I don't get a callback on the initial message.
approach 3: Finally, I also tried using the TwilioAdapter when sending the proactive message but for some reason as soon as I send an activity, the TurnContext is disposed, so I can't save the state or do any subsequent actions. This leads me to believe twilio adapter is not intended to be used this way (can't be used on proactive messages), but I'm willing to explore this path if necessary.
Here is the modified Twilio Adapter:
public class TwilioAdapterWithErrorHandler : TwilioAdapter
{
private const string TwilioNumberKey = "TwilioNumber";
private const string TwilioAccountSidKey = "TwilioAccountSid";
private const string TwilioAuthTokenKey = "TwilioAuthToken";
private const string TwilioValidationUrlKey = "TwilioValidationUrl";
public TwilioAdapterWithErrorHandler(IConfiguration configuration, ILogger<TwilioAdapter> logger, TwilioAdapterOptions adapterOptions = null)
: base(
new TwilioClientWrapperWithCallback(new TwilioClientWrapperOptions(configuration[TwilioNumberKey], configuration[TwilioAccountSidKey], configuration[TwilioAuthTokenKey], new Uri(configuration[TwilioValidationUrlKey]))), adapterOptions, logger)
{
OnTurnError = async (turnContext, exception) =>
{
// Log any leaked exception from the application.
logger.LogError(exception, $"[OnTurnError] unhandled error : {exception.Message}");
Task[] tasks = {
// Send a message to the user
turnContext.SendActivityAsync("We're sorry but this bot encountered an error when processing your answer."),
// Send a trace activity, which will be displayed in the Bot Framework Emulator
turnContext.TraceActivityAsync("OnTurnError Trace", exception.Message, "https://www.botframework.com/schemas/error", "TurnError")
};
Task all = Task.WhenAll(tasks); //task with the long running tasks
await Task.WhenAny(all, Task.Delay(5000)); //wait with a timeout
};
}
}
Modified client Wrapper:
public class TwilioClientWrapperWithCallback : TwilioClientWrapper
{
public TwilioClientWrapperWithCallback(TwilioClientWrapperOptions options) : base(options) { }
public async override Task<string> SendMessageAsync(TwilioMessageOptions messageOptions, CancellationToken cancellationToken)
{
var createMessageOptions = new CreateMessageOptions(messageOptions.To)
{
ApplicationSid = messageOptions.ApplicationSid,
MediaUrl = messageOptions.MediaUrl,
Body = messageOptions.Body,
From = messageOptions.From,
};
createMessageOptions.StatusCallback = new System.Uri("https://myApp.ngrok.io/api/TwilioSms/SmsStatusUpdated");
var messageResource = await MessageResource.CreateAsync(createMessageOptions).ConfigureAwait(false);
return messageResource.Sid;
}
}
Finally, here's my summarized code that sends the proactive message:
[HttpPost("StartConversationWithSuperBill/{superBillId:long}")]
[HttpPost("StartConversationWithSuperBill/{superBillId:long}/Campaign/{campaignId:int}")]
public async Task<IActionResult> StartConversation(long superBillId, int? campaignId)
{
ConversationReference conversationReference = this.GetConversationReference("+17545517768");
//Start a new conversation.
await ((BotAdapter)_adapter).ContinueConversationAsync(_appId, conversationReference, async (turnContext, token) =>
{
await turnContext.SendActivityAsync("proactive message 1");
//this code was edited for brevity. Here I would start a new dialog that would cascade into another, but the end result is the same, as soon as a message is sent, the turn context is disposed.
await turnContext.SendActivityAsync("proactive message 2"); //throws ObjectDisposedException
}, default(CancellationToken));
var result = new { status = "Initialized fine!" };
return new JsonResult(result);
}
private ConversationReference GetConversationReference(string targetNumber)
{
string fromNumber = "+18632704234";
return new ConversationReference
{
User = new ChannelAccount { Id = targetNumber, Role = "user" },
Bot = new ChannelAccount { Id = fromNumber, Role = "bot" },
Conversation = new ConversationAccount { Id = targetNumber },
//ChannelId = "sms",
ChannelId = "twilio-sms", //appparently when using twilio adapter we need to set this. if using TwiML app and not using Twilio Adapter, use the above. Otherwise the frameworks interprets answers from SMS as new conversations instead.
ServiceUrl = "https://sms.botframework.com/",
};
}
(I can see that I could just call create conversation reference and do two callbacks, one for each message, but in my actual code I'm creating a dialog that sends one message and then invokes another dialog that starts another message)
Edit 2:
Some clarifications:
On approach 2, I'm using two adapters, as suggested by code sample and documentation on using twilio adapter. The controller that starts the proactive message uses an instance of a default adapter (similar to this one), and TwilioController (the one that gets the twilio incoming messages) uses TwilioAdapterWithErrorHandler.
On approach 3, I excluded the default adapter, and both controllers use TwilioAdapterWithErrorHandler.
Edit 3:
Here's a small repo with the issue.
I found a fix for this problem, around approach 3, by changing the overload I use for ContinueConversation. Replace this :
//Start a new conversation.
await ((BotAdapter)_adapter).ContinueConversationAsync(_appId, conversationReference, async (turnContext, token) =>
With this:
//Start a new conversation.
var twilioAdapter = (TwilioAdapterWithErrorHandler)_adapter;
await twilioAdapter.ContinueConversationAsync(_appId, conversationReference, async (context, token) =>
This way, the context is not disposed, an I can use the twilio adapter for the proactive message and have status callbacks on all messages.
I'm putting together a Solace Point-to-point solution in C#.
In my subscriber/listener, I am using ClientAck mode to ensure messages are successfully processed before being removed from the queue.
My question (probably due to my limited experience in messaging) is regarding failed messages, e.g. if I cannot process the message and hence not send the Ack, how is the message replayed?
An example of what I have is as follows:
using (ISession session = context.CreateSession(sessionProperties, null, null))
{
ReturnCode returnCode = session.Connect();
if (returnCode == ReturnCode.SOLCLIENT_OK)
{
var endpointProps = new EndpointProperties()
{
Permission = EndpointProperties.EndpointPermission.Consume,
AccessType = EndpointProperties.EndpointAccessType.Exclusive
};
using (IQueue queue = ContextFactory.Instance.CreateQueue(queueName))
{
session.Provision(queue, endpointProps,
ProvisionFlag.IgnoreErrorIfEndpointAlreadyExists | ProvisionFlag.WaitForConfirm, null);
_flow = session.CreateFlow(new FlowProperties { AckMode = MessageAckMode.ClientAck }, queue, null, HandleMessageEvent, HandleFlowEvent);
_flow.Start();
do { WaitEventWaitHandle.WaitOne(); } while (!cancellationToken.IsCancellationRequested);
};
return Task.CompletedTask;
}
else
{
throw new Exception($"Connection failed, return code: {returnCode}");
}
}
and then handling incoming messages
void HandleMessageEvent(object sender, MessageEventArgs args)
{
using (IMessage message = args.Message)
{
try
{
_handler(message.ApplicationMessageType, message.BinaryAttachment);
_flow.Ack(message.ADMessageId);
}
finally
{
WaitEventWaitHandle.Set();
}
}
}
So, if I don't Ack, message remains on queue as expected (and required), however, how (best-practice) can I re-process it without manual intervention?
After a message has been delivered to a consumer from a Solace PubSub+ queue, the message will only be resent if the client unbinds before sending an acknowledgement back. The exception to this is specific to JMS clients with the session.recover() action.
If a message needs to be re-delivered to a C# application after it has already been sent but not acknowledged, the client will need to unbind and rebind to the queue. Note that if there are other clients also bound to the queue, the message may be re-sent to those clients before your client rebinds.
When writing a message to the Azure Service Bus (using Microsoft.Azure.ServiceBus standard library, not the .Net Framework version) it works fine. However, when switching networks to a network that blocks that traffic and running it again I would expect an error being raised by SendAsync yet no error is thrown, therefor the function considers the send successful even though it is not.
Am I missing some logic to make sure that errors do get raised and trapped, it seems to be inline with all the examples I have seen.
I have tried this possible solution ..
Trouble catching exception on Azure Service Bus SendAsync method
.ContinueWith(t =>
{
Console.WriteLine(t.Status + "," + t.IsFaulted + "," + t.Exception.InnerException);
}, TaskContinuationOptions.OnlyOnFaulted);
.. and at no point does ContinueWith get hit.
[HttpPost]
[Consumes("application/json")]
[Produces("application/json")]
public ActionResult<Boolean> Post(Contract<T> contract)
{
Task.Run(() => SendMessage(contract));
// Other stuff
}
private async Task<ActionResult<Boolean>> SendMessage(Contract<T> contract)
{
JObject json = JObject.FromObject(contract);
Message message = new Message();
message.MessageId = Guid.NewGuid().ToString();
message.ContentType = ObjectType;
message.PartitionKey = ObjectType;
message.Body = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(contract));
foreach (KeyValuePair<String, String> route in DataRouting)
{
JToken jToken = json.SelectToken(route.Value);
if (jToken != null)
{
message.UserProperties[route.Key] = jToken.Value<String>();
}
else
{
String routeError = $"Could not find routing information in request for: {route.Key} in {route.Value}";
Logger.LogError(routeError);
return new UnprocessableEntityObjectResult(routeError);
}
}
// Send the message
try
{
await topicClient.SendAsync(message);
}
catch(Exception ex)
{
return new UnprocessableEntityObjectResult($"'Could not transmit message to service bus - {ex.Message}'");
}
return new OkObjectResult(true);
}
I expect that the error trap would be hit if the SendAsync fails to send the message. However it essentially fire and forgets, the message send is blocked by the firewall but is never reported to the caller by throwing an error.
Ok, found the answer, but I will leave this out there in case anyone else does this to themselves. It was down to my general muppetry when putting the MVC Controller together. Set async on the Post action and configure the await on the send. Obvious really but I missed it.
public virtual async Task<ActionResult<Boolean>> Post(Contract<T> contract){}
...
// Send the message
try
{
await topicClient.SendAsync(message).ConfigureAwait(false);
return new OkObjectResult(true); // Success if we got here
}
catch(Exception ex)
{
return new UnprocessableEntityObjectResult($"'Could not transmit message to service bus - {ex.Message}'");
}
Is there any way to send Upstream notification message through FCM from one android device to another devices connected with Firebase database.
I know that XMPP server can then receive the upstream messages and send the notifications to the other devices.To receive messages sent with the upstream API i need to implement an XMPP server but there is any other way???
Is there any way to send Upstream notification message through FCM
from one android device to another devices connected with Firebase
database?
Currently it's NOT possible to send messages directly from one device to another.
(or at least it's not possible without introducing a HUGE security vulnerability: more details below)
Full details:
Sending messages to a user device is a pretty serious action!
based on the payload a message can result in spam, phishing, execution of internal methods.
You want this operation to be allowed only be trusted entities, this is why the FCM send API requires the SERVER-API-KEY in the authentication header.
Adding the SERVER-API-KEY in your app code (or communicating it to the app in some other way) IS NOT SAFE. This because apk can be extracted, decompiled, inspected, executed on emulators, executed under debugging and so on.
The best way to implement this today: is to have some sort of server between the two devices:
[DeviceA] -- please send message to B --> [SERVER] -- fcmSendAPI --> [DeviceB]
The server can be as simple as a PHP page, or a more complex XMPP implementation.
An example in Node.js can be found here:
Sending notifications between devices with Firebase Database and Cloud Messaging
Finally, after 2 months of trying to maintain reliable server script myself, I suddenly found OneSignal. It's completely free, supports device-to-device push messages on iOS, Android, WP and browsers.
Hope, I won't get flag for promotion spam, but it's currently the only (and easiest) way to be completely "backendless".
Also, it's completely secure way. Nobody can send push unless he knows special OS user id, which you can store in Firebase Database protected by rules.
UPD: It's not a replacement for Firebase. It has only push service and nothing else
UPD2: Firebase now has Functions, and examples of it usage has sending FCM. You now don't need any other server or service. Read more in official samples https://github.com/firebase/functions-samples
After lots of try finally i got one solution and its work perfectly
Step 1 :Include two library.
compile 'com.squareup.okhttp3:okhttp:3.4.1'
compile 'com.google.firebase:firebase-messaging:9.2.0'
Step 2 : In your MainActivity or from where you want to send notifications.
OkHttpClient mClient = new OkHttpClient();
String refreshedToken = "";//add your user refresh tokens who are logged in with firebase.
JSONArray jsonArray = new JSONArray();
jsonArray.put(refreshedToken);
Step 3: Create one async task which sends notifications to all devices.
public void sendMessage(final JSONArray recipients, final String title, final String body, final String icon, final String message) {
new AsyncTask<String, String, String>() {
#Override
protected String doInBackground(String... params) {
try {
JSONObject root = new JSONObject();
JSONObject notification = new JSONObject();
notification.put("body", body);
notification.put("title", title);
notification.put("icon", icon);
JSONObject data = new JSONObject();
data.put("message", message);
root.put("notification", notification);
root.put("data", data);
root.put("registration_ids", recipients);
String result = postToFCM(root.toString());
Log.d("Main Activity", "Result: " + result);
return result;
} catch (Exception ex) {
ex.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String result) {
try {
JSONObject resultJson = new JSONObject(result);
int success, failure;
success = resultJson.getInt("success");
failure = resultJson.getInt("failure");
Toast.makeText(MainActivity.this, "Message Success: " + success + "Message Failed: " + failure, Toast.LENGTH_LONG).show();
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "Message Failed, Unknown error occurred.", Toast.LENGTH_LONG).show();
}
}
}.execute();
}
String postToFCM(String bodyString) throws IOException {
public static final String FCM_MESSAGE_URL = "https://fcm.googleapis.com/fcm/send";
final MediaType JSON
= MediaType.parse("application/json; charset=utf-8");
RequestBody body = RequestBody.create(JSON, bodyString);
Request request = new Request.Builder()
.url(Url.FCM_MESSAGE_URL)
.post(body)
.addHeader("Authorization", "key=" + "your server key")
.build();
Response response = mClient.newCall(request).execute();
return response.body().string();
}
Step 4 : Call in onclick of your button
btnSend.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
sendMessage(jsonArray,"Hello","How r u","Http:\\google.com","My Name is Vishal");
}
});
Is there any way to send Upstream notification message through FCM from one android device to another devices connected with Firebase database.
I know that XMPP server can then receive the upstream messages and send the notifications to the other devices.To receive messages sent with the upstream API i need to implement an XMPP server but there is any other way???
Is there any way to send Upstream notification message through FCM
from one android device to another devices connected with Firebase
database?
Currently it's NOT possible to send messages directly from one device to another.
(or at least it's not possible without introducing a HUGE security vulnerability: more details below)
Full details:
Sending messages to a user device is a pretty serious action!
based on the payload a message can result in spam, phishing, execution of internal methods.
You want this operation to be allowed only be trusted entities, this is why the FCM send API requires the SERVER-API-KEY in the authentication header.
Adding the SERVER-API-KEY in your app code (or communicating it to the app in some other way) IS NOT SAFE. This because apk can be extracted, decompiled, inspected, executed on emulators, executed under debugging and so on.
The best way to implement this today: is to have some sort of server between the two devices:
[DeviceA] -- please send message to B --> [SERVER] -- fcmSendAPI --> [DeviceB]
The server can be as simple as a PHP page, or a more complex XMPP implementation.
An example in Node.js can be found here:
Sending notifications between devices with Firebase Database and Cloud Messaging
Finally, after 2 months of trying to maintain reliable server script myself, I suddenly found OneSignal. It's completely free, supports device-to-device push messages on iOS, Android, WP and browsers.
Hope, I won't get flag for promotion spam, but it's currently the only (and easiest) way to be completely "backendless".
Also, it's completely secure way. Nobody can send push unless he knows special OS user id, which you can store in Firebase Database protected by rules.
UPD: It's not a replacement for Firebase. It has only push service and nothing else
UPD2: Firebase now has Functions, and examples of it usage has sending FCM. You now don't need any other server or service. Read more in official samples https://github.com/firebase/functions-samples
After lots of try finally i got one solution and its work perfectly
Step 1 :Include two library.
compile 'com.squareup.okhttp3:okhttp:3.4.1'
compile 'com.google.firebase:firebase-messaging:9.2.0'
Step 2 : In your MainActivity or from where you want to send notifications.
OkHttpClient mClient = new OkHttpClient();
String refreshedToken = "";//add your user refresh tokens who are logged in with firebase.
JSONArray jsonArray = new JSONArray();
jsonArray.put(refreshedToken);
Step 3: Create one async task which sends notifications to all devices.
public void sendMessage(final JSONArray recipients, final String title, final String body, final String icon, final String message) {
new AsyncTask<String, String, String>() {
#Override
protected String doInBackground(String... params) {
try {
JSONObject root = new JSONObject();
JSONObject notification = new JSONObject();
notification.put("body", body);
notification.put("title", title);
notification.put("icon", icon);
JSONObject data = new JSONObject();
data.put("message", message);
root.put("notification", notification);
root.put("data", data);
root.put("registration_ids", recipients);
String result = postToFCM(root.toString());
Log.d("Main Activity", "Result: " + result);
return result;
} catch (Exception ex) {
ex.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(String result) {
try {
JSONObject resultJson = new JSONObject(result);
int success, failure;
success = resultJson.getInt("success");
failure = resultJson.getInt("failure");
Toast.makeText(MainActivity.this, "Message Success: " + success + "Message Failed: " + failure, Toast.LENGTH_LONG).show();
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "Message Failed, Unknown error occurred.", Toast.LENGTH_LONG).show();
}
}
}.execute();
}
String postToFCM(String bodyString) throws IOException {
public static final String FCM_MESSAGE_URL = "https://fcm.googleapis.com/fcm/send";
final MediaType JSON
= MediaType.parse("application/json; charset=utf-8");
RequestBody body = RequestBody.create(JSON, bodyString);
Request request = new Request.Builder()
.url(Url.FCM_MESSAGE_URL)
.post(body)
.addHeader("Authorization", "key=" + "your server key")
.build();
Response response = mClient.newCall(request).execute();
return response.body().string();
}
Step 4 : Call in onclick of your button
btnSend.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
sendMessage(jsonArray,"Hello","How r u","Http:\\google.com","My Name is Vishal");
}
});