I2p-cp -

: The client application and the I2P router can reside on the same machine or different ones, communicating over a local or network socket.

: The router builds inbound tunnels and requests a "LeaseSet" from the client. This LeaseSet serves as a signed set of "entry points" that other peers can use to reach the application anonymously. Key I2CP Message Types Message Type SendMessage i2p-cp

Are you interested in an I2CP client in a specific language, or A Scalable Framework for Anonymous Communication - I2P : The client application and the I2P router

Sent by the router when it needs the client to sign a new set of tunnels for inbound traffic. Significance for Developers i2p-cp