assert_se(lldp_tlv_packet_enter_container(m, LLDP_TYPE_SYSTEM_DESCRIPTION) >= 0);
assert_se(tlv_packet_read_string(m, &str, &length) >= 0);
assert_se(lldp_tlv_packet_enter_container(m, LLDP_TYPE_SYSTEM_DESCRIPTION) >= 0);
assert_se(tlv_packet_read_string(m, &str, &length) >= 0);