some good news: You can create self-signed SSL certificates now using the Certificate Tool.
As of integration framework (B1if) version 1.22.0 (delivered with SAP Business One 9.1 PL08 and SAP Business One 9.1, version for SAP HANA PL08), the integration framework provides a Certificate Tool. The certificate tool automates the creation of a root certificate and a self-signed server certificate based on the root certificate, it also deploys the server certificate to the integration framework keystore. Based on the server certificate, the tool creates an SSL certificate for the mobile device that connects to the integration framework with the SAP Business One mobile app
A more detailed documentation is available in the integration framework version 1.22.0 or higher, (choose Start -> All programs -> Integration solution for SAP Business One -> Integration Framework -> Help -> Documents -> Operations Part 2.)
This should help when being on a lowerversion of integration framework (B1if) 1.22.0 currently!
Context/search terms: Starting with SAP Business One mobile app 1.11.1 for iOS and mobile app 1.2.0 for Android, a SSL connection without a valid SSL certificate is not possible anymore. The mobile apps show this message at logon: The certificate for this server was not issued by a trusted certificate authority. The connection to the server is disabled. Contact your IT administrator for more details