We are trying to establish a Manual Logger Web (R3) process where operators will be without wifi/cellular signal. I have the html interface accessible within the corporate wifi and will go into offline mode if I disable wifi. However, if i lock the phone (iphone 6S / Safari) or just leave it for an even short period of time (1-2min) the website is no longer available. I have tried to add the site to Safari Reading List, same problem.
So my question, what is the most stable way to support Manual Logger Web in offline mode?