Hi Huyam,
The "findsdru" function is applicable only for the USRP devices supported in the USRP® Support from Communications Toolbox support package.
The E310/E312 (USRP Embedded Series) devices are supported in the Communications Toolbox Support Package for USRP Embedded Series Radio support package. Please read the documentation for this support package for information on how to configure and connect to the radio.