B4J Question 2019-05-07 16:59:08.966:WARN:oejh.HttpParser:qtp16896308-50: Illegal character 0x5 in state=START fo

anyone knows what this means?
coming from http udp port i'm running in the program.
Non of my code produces this.
Some hacker which is trying to get access?

2019-05-07 16:59:08.966:WARNejh.HttpParser:qtp16896308-50: Illegal character 0x5 in state=START for buffer HeapByteBuffer@1691723[p=1,l=5,c=8192,r=4]={\x05<<<\x03\x00\x01\x02>>>1.1 101 Switching...\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00}