Append requested options algorithm (Kea 1.8.0)
get configured option list
get parameter request list (PRL) from query
get configured options in dhcp4 space
push back option code to PRL
for each persistent option
for each item from configured option list
get configured options in dhcp4 space
add option to response
first
found
not found or already found
for each item from configured option list
yes
option is not set in response
no
for each code in PRL