Currently, there is no code generated for following ASN.1 excerpt.
Thus application is not aware of these values.

    ProtocolIE-ID ::= INTEGER (0..65535)

    id-MME-UE-S1AP-ID  ProtocolIE-ID ::= 0
    id-HandoverType    ProtocolIE-ID ::= 1
    id-Cause           ProtocolIE-ID ::= 2
    id-SourceID        ProtocolIE-ID ::= 3
      ...

    ProcedureCode ::= INTEGER (0..255)

    id-HandoverPreparation         ProcedureCode ::= 0
    id-HandoverResourceAllocation  ProcedureCode ::= 1
    id-HandoverNotification        ProcedureCode ::= 2
    id-PathSwitchRequest           ProcedureCode ::= 3
    ...

This commit adds corresponding macro definitions in
ProtocolIE-ID.h and ProcedureCode.h respectively.

    #define ProtocolIE_ID_id_MME_UE_S1AP_ID       ((ProtocolIE_ID_t)0)
    #define ProtocolIE_ID_id_HandoverType ((ProtocolIE_ID_t)1)
    #define ProtocolIE_ID_id_Cause        ((ProtocolIE_ID_t)2)
    #define ProtocolIE_ID_id_SourceID     ((ProtocolIE_ID_t)3)
    ...

    #define ProcedureCode_id_HandoverPreparation ((ProcedureCode_t)0)
    #define ProcedureCode_id_HandoverResourceAllocation    ((ProcedureCode_t)1)
    #define ProcedureCode_id_HandoverNotification ((ProcedureCode_t)2)
    #define ProcedureCode_id_PathSwitchRequest    ((ProcedureCode_t)3)
    ...

Only types of ASN_BASIC_INTEGER and ASN_BASIC_ENUMERATED referenced
by these constant variables are handled.

Other built-in types shall be added in the future.