Use script https://downloads.linux.hpe.com/SDR/add_repo.sh (wget, chmod +x, run) or add manually:

vim /etc/apt/sources.list.d/HP-mcp.list

# HPE Management Component Pack
# Latest, here for Debian stretch:
deb http://downloads.linux.hpe.com/SDR/repo/mcp stretch/current non-free

# for Gen9 and older, use 10.xx dist:
deb http://downloads.linux.hpe.com/SDR/repo/mcp stretch/10.62 non-free

--
# GPG keys
# https://downloads.linux.hpe.com/SDR/keys.html
curl http://downloads.linux.hpe.com/SDR/hpPublicKey1024.pub | apt-key add -
curl http://downloads.linux.hpe.com/SDR/hpPublicKey2048.pub | apt-key add -
curl http://downloads.linux.hpe.com/SDR/hpPublicKey2048_key1.pub | apt-key add -
curl http://downloads.linux.hpe.com/SDR/hpePublicKey2048_key1.pub | apt-key add -

--
getting the list of packages:
grep ^Package: /var/lib/apt/lists/downloads.linux.hpe.com*

Source: https://downloads.linux.hpe.com/SDR/project/mcp/