* Lwm2m: fix bug delete zero updateAttribute * Lwm2m: front add select binding * Lwm2m: discovery only for test * Lwm2m: remove type_cast_enabled from the main branch. * Lwm2m: remove type_cast_enabled from the main branch. * Lwm2m: remove type_cast_enabled from the main branch. * Lwm2m: remove double code.