Add a sleep to re-sending nacked events

[t-persson]

Applicable Issues

fixes: #47

Description of the Change

Add a sleep when re-sending NACKed events.

Alternate Designs

Since the issue is that events are not being sent, we could reduce the size of the list so that we only ever re-send a few events each iteration. This would also reduce the CPU usage, but it would add complexity that I want to avoid if possible.

Benefits

The machines running the library will not use 100% CPU when re-sending nacked events.

Possible Drawbacks

It will make the library slower.

Sign-off

Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
have the right to submit it under the open source license
indicated in the file; or

(b) The contribution is based upon previous work that, to the best
of my knowledge, is covered under an appropriate open source
license and I have the right under that license to submit that
work with modifications, whether created in whole or in part
by me, under the same open source license (unless I am
permitted to submit under a different license), as indicated
in the file; or

(c) The contribution was provided directly to me by some other
person who certified (a), (b) or (c) and I have not modified
it.

(d) I understand and agree that this project and the contribution
are public and that a record of the contribution (including all
personal information I submit with it, including my sign-off) is
maintained indefinitely and may be redistributed consistent with
this project or the open source license(s) involved.

Signed-off-by: Tobias Persson [email protected]