AT#CEDRXS=?
Test command returns the supported <mode>s and the value ranges for the access technology,
requested eDRX value and requested Paging Time Window as compound values.
AT#CEDRXS?
#CEDRXS: 2,0,"0000","0000"
#CEDRXS: 4,0,"0000","0000"
#CEDRXS: 5,0,"0000","0000"
OK