var mrwill = db.collection('scc').doc('demo')
    mrwill.update({
       roomname: "true"
   })
.then(function() {
    return console.log("Document successfully updated!");
 })
 .catch(function(error) {
     // The document probably doesn't exist.
     return console.error("Error updating document: ", error);
 });

     mrwill = db.collection('scc').doc('demo')
     mrwill.set({ any_data:"HELLOOOOOOOO ",roomname: "true"});