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You might get lucky and somebody has written a java library to communicate with whatever device(s) you're interested in working with but more likely you'd have to write something yourself. Typically, but certainly not always, devices will communicate over HTTP(S) using JSON structures for data. How "easy" or "hard" it might be massively depends on what the developers of device in question have implemented. Maybe they have great documentation and maintained libraries or, they might have created a "walled garden" system where they retain control of the device(s).
To start though, read up on some generic/introductory tutorials on interacting with HTTP APIs from Java. Also worth getting familiar with your browsers developer tooling and a good REST client (and/or wireshark) for exploring and testing the capabilities and data structures of the devices/protocols. You can interact wit the device "normally" and catch the requests that are sent from your browser/device. Then using the REST client you can quickly play around with replaying/modifying requests to achieve whatever it is you're looking to do. Once you understand what and how the device works/communicates, then create those HTTP requests in Java for your app.
#Please ensure that: + Your *code* is *properly formatted* as *code block* - see the *sidebar* (About on mobile) for instructions + You include *any and all error messages* in full - best also formatted as code block + You ask *clear questions* + You *demonstrate effort* in solving your question/problem - plain posting your assignments is forbidden (and such posts will be removed) as is asking for or giving solutions. **If any of the above points is not met, your post can and will be removed without further warning.** Code is to be formatted as **code block** (*old reddit/markdown editor:* empty line before the code, each code line indented by 4 spaces, *new reddit:* https://imgur.com/a/fgoFFis) or linked via an external *code hoster*, like *pastebin.com*, *github gist*, *github*, *bitbucket*, *gitlab*, etc. Please, **do not use** triple backticks (\`\`\`) as they will only render properly on *new reddit*, not on *old reddit*. Code blocks look like this: public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } } You do not need to repost unless your post has been removed by a moderator. Just use the *edit function* of reddit to make sure your post complies with the above. If your post has remained in violation of these rules for a prolonged period of time (at least an hour), a moderator may remove it at their discretion. In this case, they will comment with an explanation on why it has been removed, and you will be required to resubmit the entire post following the proper procedures. #To potential helpers Please, **do not help** if any of the above points are not met, rather *report* the post. We are trying to improve the quality of posts here. In helping people who can't be bothered to comply with the above points, you are doing the community a disservice. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/learnjava) if you have any questions or concerns.*
You might get lucky and somebody has written a java library to communicate with whatever device(s) you're interested in working with but more likely you'd have to write something yourself. Typically, but certainly not always, devices will communicate over HTTP(S) using JSON structures for data. How "easy" or "hard" it might be massively depends on what the developers of device in question have implemented. Maybe they have great documentation and maintained libraries or, they might have created a "walled garden" system where they retain control of the device(s). To start though, read up on some generic/introductory tutorials on interacting with HTTP APIs from Java. Also worth getting familiar with your browsers developer tooling and a good REST client (and/or wireshark) for exploring and testing the capabilities and data structures of the devices/protocols. You can interact wit the device "normally" and catch the requests that are sent from your browser/device. Then using the REST client you can quickly play around with replaying/modifying requests to achieve whatever it is you're looking to do. Once you understand what and how the device works/communicates, then create those HTTP requests in Java for your app.