How bacnet device reply Iam message - java

I been trying to understand how bacnet java works on device reply “iam” message to the respective call
For example:
1. Device 5678 send broadcast message with new whois message(device id 1234)
2. Device 1234 replies “iam” message to device 5678.
Questions
How device 1234 send “iam” message to 5678?
Which part of JAVA code does that??
I'm happy for any input on the subject.
Best regards
Sorc

who-is and i-am are both unconfirmed BACnet services.
when a who-is is sent (broadcast or unicast) by a device, other devices present in network reply with i-am.
assuming that you are using java based BACnet stack (library) to create your own application. your application will receive i-am, that received from network in the form of callback from stack library.
in general the stack (implemented in any programming language) will decode this data and pass it to application in the form of callbacks.
hope this helps you.

On the basis that the Who-Is broadcast contains the SADR/source address, the receiving devices knows where to send it's response - if it did want to give a unicast/directed response.
You then have to listen out for the UDP (- UDP/IP -) response, and then you have to parse it, for the Object ID.

Related

How to push notification with Cloud Messaging Firebase from the server

I already have an app and I want to start sending notification to the users. I already set up everything in the app(using react native) and I checked manually that I can send notification to the devices and it works.
Now I want to run a job in the server who will push the message (with the device token) to the cloud messaging in firebase.
I can't find a lot of details about how to do it. I would like if someone can give me any guide I can use with. my server is in Kotlin(java can be good too) and I m working with gradle.
Thank you so much for the help
From a Java server you can use the Firebase Admin SDK to send messages. From that documentation comes this minimal example:
// This registration token comes from the client FCM SDKs.
String registrationToken = "YOUR_REGISTRATION_TOKEN";
// See documentation on defining a message payload.
Message message = Message.builder()
.putData("score", "850")
.putData("time", "2:45")
.setToken(registrationToken)
.build();
// Send a message to the device corresponding to the provided
// registration token.
String response = FirebaseMessaging.getInstance().send(message);
// Response is a message ID string.
System.out.println("Successfully sent message: " + response);
Note that this sends a data message, so that will always be delivered to your code, where you can decide to display a notification or not. To send a notification message, which is what the Firebase console does, you'd use:
Message message = Message.builder()
.setNotification(new Notification("This is the title", "This is the body"))
.setToken(registrationToken)
.build();
Both of these send the message to a specific registration token, so only to a single device/app instance. This means you will need to maintain a list of these tokens, in a way that allows you to send the messages to fit your needs. E.g. a common way is to store the tokens per user. For an example of that, see the functions-samples repo. While this example is in Node.js, the same logic could be applied to a Java server.
Finally: you can also send message to topics. For an example of that (again: using a Node.js server), have a look at this blog post Sending notifications between Android devices with Firebase Database and Cloud Messaging.

How to send direct message via Firebase from user to user?

I am really rookie and need an advice.
I have read documentation, and as far as i understood if you need send direct message, follow next steps:
Make authentification, eventually you get Firebase TokenId and
userId
Send them to your server side and store it in DB
When you are going to send a message you need create json and put
inside topic text and resipent userId so on...
Send this json via HTTP to your server side
When server retrive this json, it should use Firebase API to
create new message bloc child with random name in firebase
Eventually server have to find recipent user in DB by userId that we get from message.
After server will find current recipent user by userId , next we should take firebase tokenId In order to sent notification .
And send recipent user notification with such data - name of new
message bloc child
Recipent will connect to this current bloc and retrive data
It is as i understood this consept, fix me please if smth wrong?
Your suggested approach sounds good. The most important thing to realize is that you require an app server to send a downstream message to a device. Using the database as the communication mechanism between the app and the app server is a popular approach.
You could also use Cloud Messaging's upstream capabilities. But I've never tried that approach, because the database works fine for me and I had little interest in learning yet another protocol (XMPP).
You can read how I implemented it in this Firebase blog post Sending notifications between Android devices with Firebase Database and Cloud Messaging.

how to get the short codes?

how to get the short codes from a service providers?
I want to create a app that could receve these sms sent to the short codes by the user and the app should return the response to the client.
You need a suitable sms gateway. Like this two german sites:
smstrade.de
smskaufen.com

Amazon SimpleEmail: how to check if an Email has been delivered?

I tried to send emails with Amazon SES, with the Java AWS SDK, and it worked. I would like to be able to check (at a later time) whether the delivery was successful. I will define it successful if the final mailserver accepted the mail for delivery.
I saw that when you send an email you can get a messageId that uniquely identifies your email:
SendEmailRequest request = new SendEmailRequest(from, destination, message);
SendEmailResult result = service.sendEmail(request);
String messageId = result.getMessageId();
However I saw that you can get only aggregated statistics, for example with SendDataPoint (Represents sending statistics data. Each SendDataPoint contains statistics for a 15-minute period of sending activity).
I'm not using SES to send bulk emails, but personalized notifications on a very low volume and I'd be interested to check every single message.
Did I overlook something? Is it possible to do this type of check with SES?
Amazon does provide a mechanism for you to capture bounces, which provides you with contrapositive verification.
You can create a mailbox to receive bounce notifications, then tell SES to forward bounce notifications there. e.g.:
request.setReturnPath("bounces#example.com");
You can then write code to periodically check that mailbox, and parse the messages for the destination email address.
Amazon provides a brief explanation of how they handle bounces & complaints here:
http://aws.amazon.com/ses/faqs/#37
However, if you want to check if the message avoided the spam filter or was read by the end user, that is beyond the scope of SES (although they work hard to ensure deliverability).
We use Bouncely.com. You simply set the ReturnPath to bounces#bouncely.com and it tracks all the bounces and spam reports. It also has an API that allows us to unsubscribe users automatically.
Use Amazon Simple Notification Service and define an HTTP endpoint to receive notification in case of email bounces. Works perfectly.

Android -- Bluetooth Read Write Problem?

While testing and analyzing code of Bluetooth Chat, I have questions about my own program.
a) My program sends a command to another bluetooth device. (I can handle it using sample code provided)
b) It then receives a response to my previous command.
c) Based on the response received, my device sends another command.
d) It then receives a response to my command.
and the same procedure continues ...
My question is , in Bluetooth Chat program there is a handler which receives a response. How can I make sure to receive first response and then used that to send another command ... and then receive a response again based on second command, using that same handler.
My question is , in Bluetooth Chat program there is a handler which receives a response. How can I make sure to receive first response and then used that to send another command ... and then receive a response again based on second command, using that same handler.
How about using a state machine?

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