dhcp option 43 for unifi

Hello PeteH ,

Thank you for reaching out to the community, you can use the following command:

console> system dhcp dhcp-options binding add dhcpname <YOUR DHCP SERVER NAME> optionname Vendor_Encapsulated_Options(43) value '0104xxxxxxxx'

where xxxxxxxx is the hex ip address for your unifi controller

Ref: Appendix A – DHCP Options (RFC 2132).
> dhcp

Is that upper or lower case ? and what difference is that to putting the same information in the web gui DHCP page?

No difference on the GUI, and not a case sensitive.

As per my OP I have already tried that and its not worked.  Is there a log I could check?

after adding the dhcp option is that option visible from the console ?
On the logs you can refer the applog.log and *csc.log 
*ensure to enable the debugging by executing the following command: to enable/disable -  csc custom debug 
when enable you'll see the log - Toggling log level to: MAX
when disable you'll see the log - oggling log level to: WARNING
console> system dhcp dhcp-options binding show

thanks ill have a look.  This is what the binding shows

Options Configured from GUI                                                     
---------------------------                                                     
Domain_Name                                                                     
Subnetmask                                                  255.255.255.0       
Default_Gateway                                             192.168.193.1       
Domain_Name_Servers                                                             
Options Configured from CLI                                                     
---------------------------                                                     
Vendor_Encapsulated_Options(43)                             "0104C0A8BEFC"      
console>                                                                 

This is what came out of csc.log when I plugged a hub in.   I couldnt see any mention of option 43 or the hex value.

MESSAGE   Sep 25 14:55:48Z  [dhcpd_events:5179]: {"dhcpd_events":{"method":"nservice","name":"dhcpd_events:write_dhcp_lease","version":"1.2",

"type":"json","length":35,"data":{ "filename":"/tmp/dhcpd.leases", }}}  

MESSAGE   Sep 25 14:55:49Z  [dhcpd_events:5179]: service command 'write_dhcp_lease': time taken: 0.057299372 seconds with return status: '200' 

MESSAGE   Sep 25 14:55:49Z  [dhcpd_events:5179]: {"dhcpd_events":{"method":"nservice","name":"dhcpd_events:l2dhcp_commit","version":"1.2",

"type":"json","length":243,"data":{"ipaddress":"192.168.193.7","mac":"24:5a:4c:6d:ee:59","loginfo":"192.168.193.7    Mon 25 Sep 15:55:48 2023        Tue 26 Sep 15:55:48 2023       

24:5a:4c:6d:ee:59       UA-HUB","interfacename":"Port1.193","leasetime":"86400",

"clienthost":"UA-HUB","ipfamily":"0" }}}

MESSAGE   Sep 25 14:55:49Z  [dhcpd_events:5179]: service command 'l2dhcp_commit'

: time taken: 0.069874644 seconds with return status: '200'   

-------------------------------------------------------------------------------------------------------------------------------              

MESSAGE   Sep 25 14:55:56Z  [dhcpd_events:5179]: {"dhcpd_events":{"method":"nservice","name":"dhcpd_events:l2dhcp_commit","version":"1.2",

"type":"json","length"

:243,"data":{ "ipaddress":"192.168.193.7","mac":"24:5a:4c:6d:ee:59","loginfo":"192.168.193.7    Mon 25 Sep 15:55:48 2023        Tue 26 Sep 15:55:48 2023        

24:5a:4c:6d:ee:59       UA-HUB","interfacename":"Port1.193","leasetime":"86400",

"clienthost":"UA-HUB","ipfamily":"0" }}}     

MESSAGE   Sep 25 14:55:56Z  [dhcpd_events:5179]: service command 'l2dhcp_commit'

: time taken: 0.069379783 seconds with return status: '200'                    

------------------------------------------------------------------------------------------------------------------------

MESSAGE   Sep 25 14:56:09Z  [dhcpd_events:5179]: {"dhcpd_events":{"method":"nservice","name":"dhcpd_events:l2dhcp_commit","version":"1.2",

"type":"json","length":243,"data":{"ipaddress":"192.168.193.7","mac":"24:5a:4c:6d:ee:59","loginfo":"192.168.193.7    Mon 25 Sep 15:55:48 2023        Tue 26 Sep 15:55:48 2023       

24:5a:4c:6d:ee:59       UA-HUB","interfacename":"Port1.193","leasetime":"86400",

"clienthost":"UA-HUB","ipfamily":"0" }}}  

MESSAGE   Sep 25 14:56:09Z  [dhcpd_events:5179]: service command 'l2dhcp_commit'

: time taken: 0.072741593 seconds with return status: '200' 

Indeed there is not much, I'd request you to log a technical support case, and revert us a case id here.