RCS is off-topic.
Regarding Push, there is UnifiedPush which has already seen a wide adoption, e.g. Matrix. That's also the one used by Nfty. It's free and opensource and can be used by anyone.
RCS is off-topic.
Regarding Push, there is UnifiedPush which has already seen a wide adoption, e.g. Matrix. That's also the one used by Nfty. It's free and opensource and can be used by anyone.