How to connect over adb without mDns

How do i connect to the UNO Q when its in SBC mode over adb when AppLab does not see my board? I can connect with ssh, but 'adb devices' lists no devices and AppLab reports no boards found, even though mdns-scan shows that the board is present:

+ UnoQ2Gb2._arduino._tcp.local

Possibly the issue is with my [*]router and I am looking into that, but even if I try:

adb connect 192.168.1.82

this results in:

failed to connect to '192.168.1.82:5555': Connection refused

I thought to try the following on the UNO Q:

adb tcpip 5555

but the adb command does not exist on the Q and Googling suggests that I shouldn't need to install adb tools. In any case, adb works over USB.

So the board is alive and well and I can connect over ssh, but not over adb apparently.

[*] A month ago we changed provider and I replaced the broadband router. I also have 2 separate WiFi APs and all devices run OpenWrt. I have installed umdns on all of them and can now see more devices broadcasting their mDNS name, presumably because it now shows me devices attached to all of them, but nothing has changed with AppLab or adb.