Constant gnunet_sys::GNUNET_CORE_KxState_GNUNET_CORE_KX_STATE_UP

pub const GNUNET_CORE_KxState_GNUNET_CORE_KX_STATE_UP: GNUNET_CORE_KxState = 3;

The other peer has confirmed our session key + PING with a PONG message encrypted with their session key (which we got). Key exchange is done.