Correct. The current app supports only an auth enabled (Set to "true") scenario. I do agree adding capability to support unauthenticated exports will make it more extendable. This will need some code changes. I can include this in the next release.
For now, if you have access on the influxdb side, enabling user authentication is the cleaner way to resolve the issue. Another option would be make some changes on the back-end lib file (if you have access to the splunk searchhead).
Edit line 71 on splunk_to_influxdb.py (located in you splunkroot->etc->apps->influxdb_connect->lib)
change it form
posturl = 'http://%s:%s/write?db=%s&precision=ms&p=%s&u=%s' % (infdbhost,infdbport,infdbdb,infdbaccs,infdbuser)
posturl = 'http://%s:%s/write?db=%s&precision=ms' % (infdbhost,infdbport,infdbdb)
Note that this is not a clean way of doing this (you are essentially ignoring the user and passwd defined on splunk side) .... but I think it should work for now for you to export data out of splunk into influxdb.
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