* 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.