Before I even use OpenWRT, I would like to know what Bluetooth BLE support looks like under OpenWRT.
I'm currently writing a C++ program (so far ESP32), which unfortunately has its limits because I would need postgreSQL access (MERGE). So it would of course be great if I could put this on an OpenWRT router.
The project is an interface to the SmartWatch ("08/15 cheap" with H-Band app).
Setting/reading (via MQTT) settings works quite well, but there are problems when reading out the "archived health records" (heartbeat, blood pressure, ECG,...) because I don't have MQTTv5 support (timestamp) with ESP32 and therefore only "now " can use values. Reading the data from 9:00 a.m. to 12:00 p.m. overwrites and ultimately produces garbage.
Taking your other thread into account, neither of the devices you mention there have the resources to run postgresql, but it technically is packaged for OpenWrt.
However, you should reconsider if you really want to run a full blown DBMS on your router, the border gateway shielding you from the open internet. Conventional wisdom suggests keeping the attack surface of your router small, to avoid running non-router tasks on this hardware. Especially for more server oriented tasks you should also prefer a more general purpose OS, with in-place upgrades and active security support for exactly this kind of system services in place, something like a RPi or some low-power/ older x86_64 systems (e.g. there are a couple of thinclients (< ~5 watts idle) on the used markets for rather little money that are capable to run arch, Debian, gentoo, fedora, mandriva/ mageia, SuSE, Ubuntu, etc. and are much better suited for this use case (full-featured, easy security support, plenty of RAM and disk space, no concerns about flash writes - and leaving the attack surface of your router untouched).
Please dont get me wrong: I don't plan to run a postgreSQL Server on that device. I only want it to operate as client.
So far it looks as if the required libraries (libpqxx etc) are available, even though I didnt check yet, if MERGE is implemented.
Also, I dont want those OW router(s) to act in first row; they'll be dedicated to subnets. For first row I would consider something like a Banana Pi Router.