OK sorted by trial and error.
The username is admin BUT the password when on WiFi is not the one set by Ethernet but the one set by HIK-Connect which is the Verification code printed on the back of the device.
Even Hikvision tech support didn't know this.
I have just bought the potentially useful HiLook Cube device: IPC-C340HA-D-W
If I reset this HiLook Cube and plug it into Ethernet. I can get to it and configure it via SADP and then add it to my HikVision NVR (NVR-216M-A) by ethernet.
BUT
As far as I can see the only way to join it to my...