tl;dr; - hAP lite running as wifi station-pseudobridge connected to a non-ROS AP, clients plugged into the hAP lite aren't getting DHCP from the non-ROS AP
The long version:
I bought a hAP lite to replace an aging, somewhat flaky WNDR3300 running DD-WRT after reading about how great MikroTik products are and wanting to experiment a bit to potentially replace a separate MoCA bridge I have (Verizon branded ActionTek MoCa routers, 1 also serving as the primary AP). So the WNDR3300 was running in client bridge mode and basically extending my LAN to a couple of low bandwidth devices which don't have wireless adapters. I would have actually preferred the hAP lite classic so I could wall mount it easier, but apparently those are hard if not impossible to come by?
Anyway, I get the hAP lite and fire it up, get it updated to v6.36.3 and get it running initially using the QuickSet (which was a bit of a pain, as when I set up QuickSet to CPE Bridge mode I lose access to the device). After some more work I get it connected to my existing non-ROS AP, all the ethernet ports bridged and a static IP assigned to the hAP so I can configure it.
This all appears to go well, until I go and swap the hAP with my old router and the clients plugged into the ethernet ports are no longer able to get an IP address via DHCP.
After more reading, I learn that I should be using station-pseudobridge mode on the wireless adapter, so I get that going, but still no go. I also try station-pseudobridge-clone mode with no change.
After even more reading, I learn that ROS may simply not handle this scenario well for some reason, yet my old WNDR3300 running DD-WRT and other client bridges I've used have worked without issue.
So in the mean time as a workaround I set up a DHCP server on the hAP with authoritative set to after-10sec-delay which is at least getting the job done (but for some reason still ends up providing IPs to other devices on occasion - can I restrict the DHCP to replying to clients that are hard-wired?), but I feel like there must be something I'm missing given how easily this has worked with other hardware.
Internet -> Verizon/Actiontec MI424WR (internet router / 802.11g/n AP / DHCP server) -> hAP lite (station-pseudobridge) -> client devices
PS - I'm very impressed by the low power consumption of the hAP lite - it draws about 900 mW idle with one ethernet port plugged in running off 5V DC. With the provided AC adapter on 120V it pulls about 1.1W idle with no ethernet clients plugged in and 1.4W idle with 2 ethernet clients plugged in. The WNDR3300 pulls around 5-6WAC in comparison.
PPS - I'm getting about 30 Mbps through the hAP to the MI424WR from across the house through a few walls - not bad, but if I could get this up to