* Install python-docx
user@host ~/Documents/git/open5gs/lib/gtp/v2/support$ \
sudo pip3 install python-docx
* Change the format of standard specification
from 29274-h70.doc to 29274-h70.docx
using Microsoft Office 2007+
* Adjust table cell in 29274-h70.docx
* Generate TLV support files
python3 gtp-tlv.py -f 29274-h70.docx -o ..