Is there a PCP client library
There's a libnatpmp
client on https://github.com/miniupnp/libnatpmp , but it seems to support IPv4 only. Is there a PCP client library that supports IPv6, so that it can do something equivalent to IGDv2 AddPinhole()
(and maybe also various NAT mapping types described in https://tools.ietf.org/html/rfc6887#page-32)?