I had developed an app in android that take some data from a database stored on a web server and draw a GUI according to data captured.The problem is that when i run app on localhost using (WAMP) it creates GUI in 2 seconds but when i connect it to the webserver it takes almost 7 to 10 minutes.I am astonished what could be the possible reason behind this.
I had not used any ASync class in my code.I had used httpclient.execute stuff to connect to web server and JSON pasring.I hope you understand.Please tell me what could be the reason behind less response time.
first thing is whats the speed of your internet ? if your connection is slow that could be the reason. and other thing is you might be doing all gui processing on client via request only. my suggtion is have screens ready and fill data via things like json/REST stuff. for others i can only tell you once you show some code.
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I made a web-server that runs on an esp32(LAN) and I have made it possible to send information to the esp itself from the servers url, (example : 192.168.1.39/?userInput=123), the number 123 is what I want to send from the application depends on the user's input (I compiled it to a packet of 8bits) so max number is 255, the server has an XML and some basic UI for viewing the information passed back and forth, I wanna be able to send the so called packet to the server and it passing it to the esp32 with almost no delay, I used google firebase before but it has way too much delay for it to be usable, I tried using a WebView and loading the URL with the number from the packet, I ran out of ideas on how to approach this would love some advice :)
I tried searching other questions here on the site, asked friends/teachers, watched a few tutorials and asked chatGPT for help but nothing was helpful.
From reading your question it seems you are lost setting up server and client at the same time. Divide the tasks into chunks you can digest:
First, setup your ESP32 webserver. Follow a tutorial like https://randomnerdtutorials.com/esp32-web-server-arduino-ide/ and test it using a normal web browser. It can be used to run GET requests easily, and the amount of data you need to transfer that should definitely be enough. Alternatively you can use curl to send client requests.
Next, develop your java client to send the appropriate request. You can test the behaviour using any standard webserver and check the logs.
Finally put the ESP32 url into your client and see whether they work together.
I am working on small chat application which is working fine when the app is visible to user. A service class which get and send data using post every 5 second when aap is visible to user and works fine. But when app.is closed and service works in background for few minutes fine. After few minutes i.e. apprx 3 minutes it get conmection refused error and never fetch data from server until.the app is again visible to user. I cant find any solution. please help.me
I uses HttpURLConnection for posting data, and a Thread and timer for regular posting.
Android suspend applications when they get into background, to make resources available for the foreground application. If you need to sync your data on the background you should use a Background Service or SyncAdapter.
Take a look at Best Practices for Background Jobs and Transferring Data Using Sync Adapters
Some tips:
Do not use manual timed HTTP requests for chats messages, its a very bad practice,
But, if you want to keep this, use some new http request library like "Volley" or "OkHttp" (this is my favorite),
If you want more professional and highly "best practice" stuff, use the Google's Firebase Cloud Messaging for chats apps, its use native google services for send messages to others apps, highly recommended.
Connection Refused can be your client (service) sending wrong data/values, wrong URL, wrong ports and wrong query, please post a piece of your code.
So im creating this game using pygame, and i have to put it up on a website, but it has to run server-side since the game is gonna be using a database locally, and the client will be able to enter a web page and click on a button and the game is gonna run, i cant make the game run completely client side because then the game wont be able to connect to my local database
Any ideas?
The way I see it you have two options:
If network connection is intermittent (not so frequent), you can use javascript (AJAX specifically) to make HTTP calls to the server whenever you need to access your database.
If you are expecting frequent (continuous) requests (i.e. multiplayer games), you would need to keep a connection alive using either
Persistent HTTP request
TCP Socket
Websocket : You probably want to use this if you want cross-browser support.
Let me know if you have any other questions regarding the options above.
I'm building an Android app in which I want to display some real time data (updated every second) which I want to stream directly from my server to the App. There will be multiple Apps connected at the same time, which should all get the same stream. I am now looking for a way to do this from both the server and the client/Android side. From the server side I can basically build anything, so I thought I'd start from the client side.
In the Android docs I found the inputStream class which I guess is what I need for this. So my first question: is the inputStream class the right tool for the job?
If so, I guess I can set it up (found some examples on the net), but from here I'm still unsure of how to build this service from the server side? Do I need to build a simple page which I constantly update, or should I use a messaging lib such as zeromq with multicasting? Any more tips/hints/pointers on which technology to use for the server side would be very welcome as well!
This depends on your data. For example if you need to keep your clients updated on some values, like weather data in a location, a simple polling mechanism will suffice. You would have to build a web page that shows the current values and the clients would have to keep polling and parsing the page in the time intervals desired.
On the other hand, if you've got a stream of binary data that need to be transferred to the client, you would need to do some socket programming. There are tons of samples like this to help you get started. Also keep in mind that to maintain your sockets with the server, you will have to keep them running in the background as a service.
I don't if the question title fits, but here is my problem:
I have a regular webhosting service in hostmonster, with a website built in php.
So I have php script running in a cron job that monitors a xml file for changes, and everytime a new entry comes into that xml file the script stores it in a database.
In the other hand there is java built desktop client, which needs to be noticed ASAP that a new entry is created, for this the client connects to a second php file every second, and this second files tells if there has been changes or not.
The thing is, every 260 connections my I.P gets banned from the server :( and the client crashes, the client will be used by several users.
I contacted support on how to handle this, but they tell me to use a single connection, I tried reusing the UrlConnection but after the first request it just gives null. then I tried with Sockets but no luck. I know there are libraries that manage this but I dont know how are they called. Can someone give me advice?
thank you guys.
Use a long polling method. Hold the connection opened until response arrives. This way you only need to ask for the update once.
PHP may not be the best tool for this job though.