I have activated remote logging and receiving syslog messages from several devices. I want to write a separate log file for each device sending syslog messages. How to achieve that?

It is pretty easy. You can use dynaFiles for it. With them, you specify a template as the file name. For each message, the filename is re-generated and the output written to the respective file. Read the config file doc for details, but it basically is:

$template DynaFile,”/var/log/system-%HOSTNAME%.log”
*.* -?DynaFile

How to separate log files by host name of sending device?
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