What should I do if Android says the CSB1 WiFi has no internet?

Stay connected to the CSB1 WiFi network.

Some phones warn that a layout WiFi network has no internet access. That is normal if the CSB1 is providing a local WiFi connection just for train control. If Android asks whether to stay connected, choose the option that keeps the phone on that WiFi network.

Imported from: DCC-EX CSB1 and Engine Driver FAQs