What are these in my tracker-server.log?

Hello from Finland!

First, Thank you for your awesome software! I have been using it couple of months now and it's working great.
I have the server installed on my vps server, my gps tracker is xexun xt-009 and I'm using Litvak's UI mod.

Today I noticed some strange things in my traccar server logs..

There are unknown IP's, ports and LONG hex strings, I checked couple of IPs in http://whatismyipaddress.com site and it says locations to Germany, France, Netherlands, Russia etc..

I know that my tracker is using port 5006, but in those IPs ports are very different like 5082, 5084, 5085 etc..

And last, very strange HEX strings, I decoded one with your site's decoder.. and I get this result.

OPTIONS sip:100@91.239.64.126 SIP/2.0
Via: SIP/2.0/UDP 127.0.1.1:5107;branch=z9hG4bK-2788896971;rport
Content-Length: 0
From: "sipvicious"<sip:100@1.1.1.1>;tag=3562656634303765313364320134323337383331333239
Accept: application/sdp
User-Agent: friendly-scanner
To: "sipvicious"<sip:100@1.1.1.1>
Contact: sip:100@127.0.1.1:5107
CSeq: 1 OPTIONS
Call-ID: 1099572618165430920716788
Max-Forwards: 70

Is somebody hacking my server or what is that?

Best Regards!

Someone is probably using port-scanning tools to search for vulnerabilities. I don't think it's targeted specifically your server. You can just disable port that those messages are coming to if you are not using it.

Ok, thanks! I'll do just that. :)