Android cannot connect to the internet over the cellular network and at the same time connect to a specific device over WiFi. Of course I could switch devices in the car but that would not be practical at all.
A few other reasons:
– I want to use this gateway later for my permanent energy management. So it will be even more impractical switching devices (two dongles in parallel is against my principles 😀 ).
– Wifi Dongles behave like access points, not as clients. I would have to make a gateway anyway.
– I wanted to play in a useful way with the Wemos. It is a very powerful and practical device. Learning by doing.

You are making a good point, but for practical reasons, it won’t work for the goals I have.

Well, at the time we started discovering on how to read the CAN bus and decrypting the received messages, Bluetooth chips were cheaply available. This is why we went that road. After all, as BT is not an option on the iPhone, the iPhone app uses a WiFi dongle. Whit the introduction of this self-made (and self controlled!) element, CanZE might learn on how to use a WiFi dongle too. You never know were the road ends up 😉 … so maybe I could be wrong as well. We will see …

Either be patient or start coding yourself, whatever comes first 😀