docs/reference/system-functional/subtopology-com-logger-tee.md
The ComLoggerTee subtopology provides a simple tee (splitter) that duplicates outgoing communication data, sending it both to the normal transmission path and to a communication logger for on-board recording. This is useful for capturing a record of all transmitted data for later analysis or debugging without modifying the primary communication path.
When inserted into the communication path, the splitter receives outgoing data, sends one copy onward to the normal transmission path, and sends another copy to the communication logger. The logger writes each buffer to a log file. Files are rotated based on a configurable size limit.