code: @Override
      public JsonElement serialize
              (CustomCommand customCommand, Type typeOfSrc, JsonSerializationContext context) {
          JsonObject jObject = new JsonObject();
          HashMap<String,String> commands = customCommand.getCommands();
          for (Map.Entry<String, String> entry : commands.entrySet()) {
             jObject.addProperty(entry.getKey(),entry.getValue());
          }
          return jObject;
      }
docs: *
  A custom serializer for Custom Command. The custom commands are received in
  HashMap and then each key value is mapped as separate properties rather than a single
  JsonArray. This allows us to add any number of custom commands and then send it in openxc
  standard message format.
  @param customCommand
  @param typeOfSrc
  @param context
  @return