Hi Faisal-Saoud,
You need to configure vendor specific option 43.
Vendor-specific option (Option 43):
DHCP servers and clients use Option 43 to exchange vendor-specific configuration information. The DHCP client can obtain the following information through Option 43:
• ACS parameters, including the ACS URL, username, and password
• PXE server address, which is used to obtain the boot file or other control information from the PXE server.
• AC address, which is used by an AP to obtain the boot file or other control information from the AC.
Refer the configuration guide (Layer 3—IP Services Configuration Guide) given below.
Page 31 onwards:
https://support.hpe.com/hpsc/doc/public/display?sp4ts.oid=5354532&docLocale=en_US&docId=emr_na-c05367526&withFrame