// send sends an MQTT Control Packet to the Server.
func (cli *Client) send(p packet.Packet) error {
// Return an error if the Client has not yet connected to the Server.
if cli.conn == nil {
return ErrNotYetConnected
}
// Write the Packet to the buffered writer.
if _, err := p.WriteTo(cli.conn.w); err != nil {
return err
}
// Flush the buffered writer.
return cli.conn.w.Flush()
}
