Happytime PPLib is a NAT Traversal and private network (LAN) access library. It can access to a private network of computers and network equipment from another private network or public network. The advantage is no need to configure port mapping on the router, without having to deploy Dynamic DNS (DDNS). Happytime PPLib is a cross-platform protocol-independent communication framework designed to simplify the task of building peer-to-peer and client-server applications and middleware components. High NAT Traversal rate Support cross-platform porting A simple and straightforward API interface Provide free client source code Provide free server source code Penetration and adaptation NAT traversal technology is completely transparent, no need to configure port mapping on the router, no deployment of dynamic domain name (DDNS) Can penetrate the all cone NAT; can penetrate the "Linux kernel native NAT" and other non-standard NAT, transmittance up to 95% Supports the use of private network communication directly between the same private network communication nodes inside Performance and reliability Based on independent research and development of "reliable UDP" transport protocol to support retransmission packet loss, accidental disconnection can automatically reconnect; superior transmission performance, bandwidth utilization can reach more than 90%, comparable with the transmission performance of TCP. Traffic congestion control algorithm independent, maintaining the stability and smooth flow of transport. Supports the creation of multiple instances of P2P nodes in the same application, each P2P node instance occupies a UDP port, to better adapt to modular programming