Great!
Makes sense. The documentation suggests that OpenWrt supports TCP syslog out of the box, but I've never tried it.
As far as encryption -- my guess (and I could be wrong) is that this is not supported by OpenWrt as standard. You may have to install some packages and/or build from source so you can enable any relevant options.
Anyway, we now know that your general syslog is working as expected via UDP... if you want to hold this thread open for a resolution on TCP and/or encryption, feel free to do so. But...
If your problem is solved, please consider marking this topic as [Solved]. See How to mark a topic as [Solved] for a short how-to.
Thanks! 