when I use streamLine in TCP mode，when I start capture, get error Info: message part too big
What version of Streamline are you using?
streamline v8.1.1
some information maybe help: when I open the Streamline.exe(not streamline-gui), has a warning [Unsupported JavaFX configuration classes were loaded from "unnamed module @xxxxx"]
That's a very old version, and I think we've fixed some issues in this area, can you try Arm Development Studio 2023.0 or Arm Mobile Studio 2023.3 (the latest Streamline version is v8.7, available in in Arm Mobile Studio).