There is more detailed info I can provide after testing different options. 1. The "SSL certificate authentication failed, continue loading?" -error message only occurs when using the "Kiosk" as default android app after power-up. When "Chromium" is set to the same destination start address (https://abc.def.ghi.jkl/webiq/webiq-ctrlx-template-v0) in this case, there is no issue with the error message, however the connection remains unsafe, http vs https. 2. Now the issue is how to run "Chromium" in full-screen, kiosk-like mode. 3. The problem with not synchronized startups between CtrlX-Core and HMI running android still remains, see my related post https://developer.community.boschrexroth.com/t5/Smart-HMI-WebIQ-Designer-and/WEBIQ-4008-ctrlX-WebIQ-Server-must-wait-until-ctrlX-is-ready/m-p/85191#M1357 (* Sorry, the IP in previous post was just an example I randomly put in the command. The actual address of course is the core static assigned permanent address.)
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