# File lib/bunny/client09.rb, line 335
                def send_heartbeat
                        # Create a new heartbeat frame
                        hb = Qrack::Transport09::Heartbeat.new('')                   
                        # Channel 0 must be used
                        switch_channel(0) if @channel.number > 0                     
                        # Send the heartbeat to server
                        send_frame(hb)
                end