For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke:opc-ua/openSUSE_Tumbleweed/home:mnhauke:opc-ua.repo
zypper refresh
zypper install open62541
For openSUSE Leap 42.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke:opc-ua/openSUSE_Leap_42.3/home:mnhauke:opc-ua.repo
zypper refresh
zypper install open62541
For openSUSE Factory ARM run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke:opc-ua/openSUSE_Factory_ARM/home:mnhauke:opc-ua.repo
zypper refresh
zypper install open62541