enum ipcp_msg_code {
        IPCP_BOOTSTRAP = 1;
        IPCP_ENROLL = 2;
        IPCP_REG = 3;
        IPCP_UNREG = 4;
};

message ipcp_msg {
        required ipcp_msg_code code = 1;
        optional string ap_name = 2;
        // Missing dif_config field here
        repeated string dif_name = 4;
        repeated string n_1_dif_name = 5;
};