No ipv6 support

[martinpaljak]

When a consumer is on an ipv6-only network, it is not possible to use the service.
=> ipv6 support should be added

When a client is on an ipv6-only network, the firebase push comes through, but then smartid app tells "there is no network" (yet I browse some parts of the internet without issues)
=> ipv6 support should be added, or the situation handled with a meaningful error report.