LaserJet Printing

I see in the syslog of my new LaserJet Pro MFP M479fdw DHCP error messages every 5 minutes.

This might be also the reason, why the printer is not going into the sleep mode.

The wire network is configured with static IP address. The wireless network is switched off.

Why is there any DHCP activity in this configuration?

And why this leads to an error?

I need a solution to solve the issue and to have the possibility to go to sleep mode and to stop the syslog spam.

syslog:

Information	2021-06-02T11:28:14	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: _dhcp_server_addr_mgmt_janitor_cb | wrote correct number of bytes: 4]
Information	2021-06-02T11:28:13	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: DHCP_SERVER_entry() | Calling select() with NULL timeout!]
Information	2021-06-02T11:28:12	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: DHCP_SERVER_entry() | Set dhcp_server_fd (155364) in RD_FDSET!]
Information	2021-06-02T11:28:11	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: DHCP_SERVER_entry() | Set dhcp_server_link_fd in RD_FDSET!]
Information	2021-06-02T11:28:11	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: DHCP_SERVER_entry() | Set dhcp_server_socket socket (751) in RD_FDSET!]
Information	2021-06-02T11:28:10	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: DHCP_SERVER_entry() | select() returned (LEAVING 'ret > 0') !]
Information	2021-06-02T11:28:09	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: DHCP_SERVER_entry() | Done with dhcp_server_read_fd event!]
Information	2021-06-02T11:28:08	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: DHCP_SERVER_janitor() | exit]
Information	2021-06-02T11:28:07	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: dhcp_server_addr_mgmt_janitor() got called]
Information	2021-06-02T11:28:06	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: DHCP_SERVER_janitor() | enter]
Information	2021-06-02T11:28:05	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: DHCP_SERVER_entry() | calling DHCP_SERVER_janitor]
Information	2021-06-02T11:28:04	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: DHCP_SERVER_entry() | dhcp_server_fd_msg: 1]
Information	2021-06-02T11:28:03	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: DHCP_SERVER_entry() | read > 0 bytes on dhcp_server_read_fd event: 4]
Information	2021-06-02T11:28:02	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: DHCP_SERVER_entry() | Recv'd a dhcp_server_read_fd event!]
Information	2021-06-02T11:28:01	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: _dhcp_server_addr_mgmt_janitor_cb fired]
Information	2021-06-02T11:28:01	SYSTEM	Event detection: Received log which severity is [err]. Log content: [dsrv: DHCP_SERVER_entry() | select() returned (ENTERING 'ret > 0') !]