Again, I reiterate, because this is important! Remote syslog over UDP is really easy to setup and configure, look over here for receiver-side configuration, if you are primarily interested in receiving log messages from, say, a network switch or access point device that does not have its own persistent storage for log data.
20200106/https://www.rsyslog.com/receiving-messages-from-a-remote-system/
20200106/https://www.rsyslog.com/storing-messages-from-a-remote-system-into-a-specific-file/
Look here fore setup on the OpenWRT/LibreCMC side.
20200106/https://www.rsyslog.com/storing-messages-from-a-remote-system-into-a-specific-file/
Nevertheless, I haven’t got around to setting up my own system until a long delay after initial research and learning.