togglebutton.dart

new Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    new Text('Front Light'),
                    new Switch(
                  value: widget.toggleFL, 
                  onChanged: (value){
                    setState(() {
                     widget.toggleFL = value;  // toggle the button and its value                   
                     });
                    
                    
                    print(widget.toggleFL);
                    
                       if(widget.toggleFL == true){
                          print(':Publishing our topic: frontlite1');
                         widget.channel.sink.add("frontlite1"); // send message to server to ON frontlite
                        }else{
                            print(':Publishing our topic: frontlite0'); 
                          widget.channel.sink.add("frontlite0"); // send message to OFF frontlite
                        }
                  
                                               
                         
                    }),
                  ],
                ),