Hello, I need to send a null character at the end of a message on a tcp output... But this null is considered to be an end of string. My use case is sending a GELF message to a graylog's tcp input. GELF message is a json syntax quite simple to comply with thanks to format-json. Graylog needs a null character at the end of a GELF message in TCP but not in UDP. I tried many combination in the template with \x0, echo \x0, `global_definition_of_null`, etc... The matter is that null character when interpreted is an end of string, and is not written in the tcp message. I see truncated messages with ngrep. Like "a\x0b" gives "a" according to ngrep. I did not find any option to actually write a null character. Do you have any options ? As Graylog already have clients and librairies I belive they won't remove the need for a null character. Shall I open an issue on syslog-ng to ask for an option in templates or in format-json ? Regards, Nicolas Fédou.