how to send data to other conn?

[zzxap]

events.Data = func(c evio.Conn, in []byte) (out []byte, action evio.Action) {
fmt.Println("events.Data ")
if in == nil {
//how to know is close action?
fmt.Println("in is nil Closed")
action = evio.Close
return

	} else {
                 // how to send data????????
		fmt.Println("dataToSend ")
		//dataToSend := c.Context().([]byte)
		//if dataToSend != nil {
		//	out = append(out, dataToSend...)
		//	return
		//}
	}

	fmt.Println("ReceiveData ")
	fmt.Println(string(in))
	toConn, _ := getconnByJsonData(c, in)
	if toConn != nil {
		fmt.Println("send Data ")
		toConn.SetContext(in)
		toConn.Wake()
	}

	return
} 

I save conn in a map userid->conn
and get it by getconnByJsonData(c, in)
how to send data to other conn?