I want to run an MQTT broker/server in my iOS app as a background thread and my neighbouring devices talk to my app over MQTT topics. I found a similar app in Google playstore. I am not sure if there are any libraries that I can use without reinventing the wheel.
Thanks for your answers
I can’t speak to the state of MQTT libraries, but I can address the issue of servers in general.
It’s possible for an iOS app to include a server component but running that server in the background is not possible in the general case. For a server to work the app must not be suspended (see Technote 2277 Networking and Multitasking for more background on this). iOS provides no general-purpose mechanism for an app to run indefinitely in the background, and thus no easy way to run a server reliably.
So, if your app is running indefinitely in the background for some other reason, implementing a server within your app should be straightforward. But for most apps, which get suspended shortly after moving to the background, implementing a server that runs while they’re in the background is not feasible.
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