+int lldp_read_system_name(tlv_packet *tlv, uint16_t *length, char **data);
+int lldp_read_system_description(tlv_packet *tlv, uint16_t *length, char **data);
+int lldp_read_system_capability(tlv_packet *tlv, uint16_t *data);
+int lldp_read_port_description(tlv_packet *tlv, uint16_t *length, char **data);