background-process | Start processes in the background | BPM library

I have a Flutter library that work well in Flutter main.dart but I need to use it in Android services to run in background.

Since Flutter hasn't support Services yet (as I know), so I create a native Android Service using Java and start it using MethodChannel. But I don't know how to use the Flutter library inside my Service.

So is it possible to use the Flutter library inside Android Service or I need to convert the library to Java code?

I already researched Isolate, Background processes and Geofencing but they are not 100% same as Service.

Please note, the Django server is Daphne, but the websockify command has nothing to do with Daphne channels.

I have the following oversimplified code in Django view:

I'm developing an App in Swift 5 that connects to a wereable device that measure body information (temperature, heart rate, etc.)

For measure this information, I have to write a Data object in one characteristic of the device (and recieve the information in other characteristic with notifications activated), and now i have to measure it every 30 minutes, so i have to create a timer with repeata every 30 minutes to execute that "write" in the BLE characteristic. (All the options in Capabilities are already activated - bluetooth-central, bluetooth-peripheral, background-processing, background-fetch)

I've read a lot of topics in Stackoverflow and there are people that says that you can't write to BLE in background and other that say that you can.

Before to implement all the posibilities i've read: ¿It's possbile to execute every 30 minutos a task to connect to a device, set notification to true to one characteristic, and write a Data object in one characteristic in Background Mode?

If the response is "Yes", is there any code that I have to implement apart from the corresponding bluetooth methods that already work in the foreground?

I've not attach my BLEManager class (centralManager) because is the "standard" from the Apple Documentation, but if you need, ask me and I'll attatch it.

Thank u all!

Issue in brief: trying to access location data of the user in background using location and workManager plugin. Currently with the code mentioned below i am able to access the location information if the application is open, Since callbackDispatcher is a top level function i am not able to call the location plugin. location plugin works when a call is done inside of the class. I am trying a way to access _getlocation() from callbackDispatcher, I am getting PlatformException(NO_ACTIVITY).

Things I have tried: found few other guys facing similar issue here, here and here Tired all these steps and no luck.

The plan: I am coding for a web site on which the users need to upload large JSON files (50MB - 500MB+). These JSON files contain information about the users. The site must retrieve these information and after that store it on a MySQL database that I have created. I am using JSON machine (https://github.com/halaxa/json-machine) instead of JSON decode (https://www.php.net/manual/en/function.json-decode.php) to parse these large JSON files faster. So the process goes like this:

1) The user uploads his own large JSON file.

2) I parse his JSON and store his data temporarily on my machine.

3) I send the data from my machine to MySQL database.

(I have also code for the last two steps combined).

2-3) After uploading is finished I parse the large JSON and store the data directly to MySQL.

Now the problem: I want the users to be occupied only for the first step (the upload), after that I want to let them free and able to navigate to other pages of my website even if the other two (or one) step(s) haven't been completed yet. So my problem is the time. The last two steps might take some minutes or even a lot of hours and I don't want to keep users waiting after they finish the upload of their JSON file.

My solutions: When this problem came up I tried to find a way to run the last two processes on the background and I found this (php background process in windows environment) although it didn't work out. After that, I tried AJAX. I thought if the page does not reload, the user will be able to navigate, but that didn't work either. The page now does not reload when a user uploads a JSON but the user is still occupied for the whole duration of the three steps. Also, ignore_user_abort() (https://www.php.net/manual/en/function.ignore-user-abort.php) is not a solution because in my case I don't want to let the users abort the page, I want them to keep navigating.

I have to mention that the code is working properly, it gets users JSON files and after that it parses and stores everything to my MySQL database exactly like I want it to do, but it just keeps the users waiting for hours because of the thousands of inserts it has to execute for the database, especially if they have a very large JSON file. I have tried many things and I still don't know what I have to do to fix this problem. Αny kind of help is welcome!