thank you for no answers!!
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i find a WORKING solution by myself: i purchased "
Filebrowser" from app store. It works well, without so much stupid configurations (the only request of Filebrowser is the ipaddress and, doh!, it works!! Your Shareport mobile asks username, password, ip address, network name, port: i tried to leave them blank, filled, with backslash, without backslash, 8181, 8080...i tried all possible combinations the result was always the same "impossible to establish a connection"!).
A suggestion: update your app Shareport mobile and make it simpler to configure. Add a guide and make it work!