If you have still not found a solution, you should search the lists before posting a question.
Someone may have already solved the problem:
search on the NUT lists using Google
Finally, you can subscribe to a NUT mailing list to:
Use the NUT Users mailing list.
In this case, be sure to include the following information:
complete problem description, with any relevant traces, like system log excerpts, and driver debug output. You can obtain the latter using the following command, as root and after having stopped NUT:
/path/to/driver -DD -a <upsname>
If you don’t include the above information in your help request, we will not be able to help you!
Use the NUT Developers mailing list.
Refer to the NUT Developer Guide for more information, and the chapter on how to submit patches.
Use the NUT Packagers mailing list.
Refer to the NUT Packager Guide for more information.