I don't really understand that. A Davis Vantage wireless transmitter uses neither WiFi nor Bluetooth and so it can't ever be received directly on a tablet.
I only quoted this part because it seems you haven't read my posts. I clearly stated earlier that either a receiver chipset would have to be added to a tablet or a dongle that would plug into the USB port could be designed. A receiver chipset would add a couple of bucks to the cost to manufacture a "custom" tablet or a few bucks more for a separate dongle.
Secondly, on the USB port. There are many attachments that use a tablets USB port that also include an extra port that allows you to charge/power the tablet at the same time. I use an HDMI adaptor on my Nexus 7 that lets me attach it to my TV and it allows me to plug in my AC wall adaptor. You plug the HDMI adaptor into the USB port of the tablet, then plug an AC adaptor into it. That HDMI adaptor cost me less than $10. Nothing untidy about that.
So you are saying that a separate dongle that would include nothing more than a couple usb ports, a receiver chipset, an antenna and maybe a couple other interface chips would cost $175? This is more than a whole new Davis console now costs that includes that plus processor, memory, temp. sensor, LCD display, buttons, etc? You already said something like a PI could be used. They cost $25 and have a lot more in them then what would be needed for a wireless dongle. Not sure where you are coming up those $175 figures.
Heck, a separate dongle (or even custom tablet) could even save them money as they wouldn't need to make separate consoles for the VP2 and VUE, use the same display. Only sell a few hundred? They sell a lot more stations than that plus you'd have a good percentage that would want to upgrade their old systems to something a bit more modern and useful.
Not going to comment any more on this. You think it's very difficult. I say that Davis is going to milk the weather community of their money for old outdated equipment. That is until the time that they are forced to give something that is beyond the 1980's. The best part of the Davis equipment are the outdoor sensors, that is what makes Davis equipment better than the other brands. There is no reason to change that. Everything else is old and outdated.