Restore timeout in JNI event loop

[kpschoedel]

Problem

The event loop in JNI IOThreadMain() used to wait no more than ten
seconds on each iteration. This timeout was temporarily removed in
PR #6561.

Change overview

Add an explicit timer.

Also removes another obsolete TODO.

Fixes #7756 add a timer for sleepTime.tv_sec = 10; sleepTime.tv_usec = 0;
Fixes #7757 Integrate timer platform details with WatchableEventManager.

Testing

Passes Android workflow.

[mspang]

Why is this needed?

[mspang]

I'd like some more context, anything that depends on this is 1) going to have a 10 second latency associated with which isn't desirable and 2) is obviously not managing its wakeups properly.

[kpschoedel]

Why is this needed?

It may well not be. Before the socket-event PR, the select() in that code had a 10 second timeout; I have no knowledge of the reason. I'll just as happily remove the TODO without adding a timer.

[mspang]

Why is this needed?

It may well not be. Before the socket-event PR, the select() in that code had a 10 second timeout; I have no knowledge of the reason. I'll just as happily remove the TODO without adding a timer.

Yes, I've seen it, and it raised my eyebrow. We don't want to wake up the stack every 10 seconds and drain the battery for no reason.

No sane code should need this.

[kpschoedel]

No sane code should need this.

Given that it hasn't been present for a month, no insane code needs it either.

I'll just prune the obsolete TODOs in some future cleanup PR.

[github-actions]

Size increase report for "esp32-example-build" from 6b6c2ee

File	Section	File	VM
chip-ipv6only-app.elf	.flash.text	-172	-172
chip-lock-app.elf	.flash.text	64	64
chip-temperature-measurement-app.elf	.flash.text	60	60
chip-all-clusters-app.elf	.flash.text	-80	-80
chip-shell.elf	.flash.text	-24	-24

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-ipv6only-app.elf and ./pull_artifact/chip-ipv6only-app.elf:

sections,vmsize,filesize
[Unmapped],0,172
.flash.text,-172,-172

Comparing ./master_artifact/chip-pigweed-app.elf and ./pull_artifact/chip-pigweed-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-bridge-app.elf and ./pull_artifact/chip-bridge-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-lock-app.elf and ./pull_artifact/chip-lock-app.elf:

sections,vmsize,filesize
.flash.text,64,64
[Unmapped],0,-64

Comparing ./master_artifact/chip-temperature-measurement-app.elf and ./pull_artifact/chip-temperature-measurement-app.elf:

sections,vmsize,filesize
.flash.text,60,60
[Unmapped],0,-60

Comparing ./master_artifact/chip-persistent-storage.elf and ./pull_artifact/chip-persistent-storage.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-all-clusters-app.elf and ./pull_artifact/chip-all-clusters-app.elf:

sections,vmsize,filesize
[Unmapped],0,80
.flash.text,-80,-80

Comparing ./master_artifact/chip-shell.elf and ./pull_artifact/chip-shell.elf:

sections,vmsize,filesize
[Unmapped],0,24
.flash.text,-24,-24