pex_reactor.go
func (r *PEXReactor) RequestPEX(p *Peer) {
	p.Send(PexChannel, struct{ PexMessage }{&pexRequestMessage{}})
}
func (r *PEXReactor) RequestPEX(p *Peer) {
	p.Send(PexChannel, struct{ PexMessage }{&pexRequestMessage{}})
}
func ( r * PEXReactor ) RequestPEX ( p * Peer ) { p . Send ( PexChannel , struct { PexMessage } { & pexRequestMessage { } } ) }
// RequestPEX asks peer for more addresses.
RequestPEX asks peer for more addresses .