is RELP exist outside of RSYSLOG protocol if so were? i want to know if the relp protocol has more to it then a protocol that has been writen to the rsyslog
In addition to Philippe's answer: Logstash also has a RELP input. You can find the implementation here (for version 1.2.2):
https://github.com/logstash/logstash/blob/v1.2.2/lib/logstash/util/relp.rb