code: function(dbresult) {
          // start with response header
          var jsonresponse= // validate syntaxe at http://geojsonlint.com/
            {"type":"GeometryCollection"
            ,"device":
              {"type":"Device"
              ,"class":device.class
              ,"model": device.model
              ,"call": device.call
            },"properties":
              {"type":"Properties"
              ,'id'  : query.devid
              ,"name": device.name
              ,'url': devurl
              ,'img': device.img
            }
            ,"geometries":[]             
            };       
       
          for (var idx in dbresult) {
              var pos = dbresult [idx];
              var ptsinfo=util.format ("%s<br>Position:[%s,%s] Speed:%s",pos.date,pos.lon.toFixed(4),pos.lat.toFixed(4),pos.sog.toFixed(1));
              jsonresponse.geometries.push (
                     {'type':'Point'
                      ,'coordinates' :[pos.lon, pos.lat]
                      ,'sog' : pos.sog
                      ,'cog' : pos.cog
                      ,'date' : pos.date.getTime()
                      ,'properties'  :
                          {'type':'Properties'
                          ,"title": ptsinfo 
                      }});
             };
      if (query.jsoncallback === undefined) {
          response.writeHead(200,{"Content-Type": "application/json"});  
          response.write(JSON.stringify(jsonresponse));
      } else {
          response.writeHead(200,{"Content-Type": "text/javascript",'Cache-Control':'no-cache'});  
          var fakescript=query.jsoncallback +'(' + JSON.stringify(jsonresponse) +');';
          response.write (fakescript);
      }      
      response.end(); 
      }
docs: DB callback return a json object with device name and possition