MQTT Feature

[rplankenhorn]

This adds support for MQTT for communicating with the Kegboard.

Kegbot/kegboard-particle#8

[patfreeman]

Tried this a while back, but failed to get it running on Android 15/16. Retried today on Android 11 and still getting the same crash about Fragments. Any suggestions for this?

02-01 17:37:02.594  2383  2383 E AndroidRuntime: FATAL EXCEPTION: main
02-01 17:37:02.594  2383  2383 E AndroidRuntime: Process: org.kegbot.app, PID: 2383
02-01 17:37:02.594  2383  2383 E AndroidRuntime: java.lang.IllegalStateException: Fragment null must be a public static class to be  properly recreated from instance state.
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at android.app.BackStackRecord.doAddOp(BackStackRecord.java:429)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at android.app.BackStackRecord.add(BackStackRecord.java:409)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at android.app.DialogFragment.show(DialogFragment.java:239)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at org.kegbot.app.setup.SetupSelectBackendFragment$2.onClick(SetupSelectBackendFragment.java:72)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at android.view.View.performClick(View.java:7448)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at android.widget.CompoundButton.performClick(CompoundButton.java:144)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at android.view.View.performClickInternal(View.java:7425)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at android.view.View.access$3600(View.java:810)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at android.view.View$PerformClick.run(View.java:28305)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at android.os.Handler.handleCallback(Handler.java:938)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at android.os.Handler.dispatchMessage(Handler.java:99)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at android.os.Looper.loop(Looper.java:223)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at android.app.ActivityThread.main(ActivityThread.java:7664)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at java.lang.reflect.Method.invoke(Native Method)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
02-01 17:37:02.594  2383  2383 E AndroidRuntime: 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)