Issue is that the data logger only supports 2.4GHz wifi, and specifically states it doesn’t work with combined Wifi signals (2.4GHz and 5GHz using same SSID)Could it be that the data logger is set up for a regional band plan that doesn't correspond to that set on the WiFi router? They should both be set to European or ETSI, or something similar.
Neighbours new router combines 2.4GHz and 5GHz in one SSID, so options were to disable the 5Ghz capability (which made it work), or buy an older Wifi access point just for the data logger. Could be there’s another way to set up the router, but I couldn’t see it (although I’m no expert on domestic broadband).
Disappointing for the vendor to claim it’s the wifi which isn’t compatible with their device, rather than their device not being compatible with modern wifi protocols.