@Override public JsonElement serialize(Registration src, Type typeOfSrc, JsonSerializationContext context) { JsonObject element = new JsonObject(); element.addProperty("endpoint", src.getEndpoint()); element.addProperty("registrationId", src.getId()); element.add("registrationDate", context.serialize(src.getRegistrationDate())); element.add("lastUpdate", context.serialize(src.getLastUpdate())); element.addProperty("address", src.getAddress().getHostAddress() + ":" + src.getPort()); element.addProperty("smsNumber", src.getSmsNumber()); element.addProperty("lwM2mVersion", src.getLwM2mVersion()); element.addProperty("lifetime", src.getLifeTimeInSec()); element.addProperty("bindingMode", src.getBindingMode().toString()); element.add("rootPath", context.serialize(src.getRootPath())); element.add("objectLinks", context.serialize(src.getSortedObjectLinks())); element.add("secure", context.serialize(src.getIdentity().isSecure())); element.add("additionalRegistrationAttributes", context.serialize(src.getAdditionalRegistrationAttributes())); if (src.usesQueueMode()) { element.add("sleeping", context.serialize(!presenceService.isClientAwake(src))); } return element; } }