make link truly optional

config.yaml

@@ -57,12 +57,14 @@ options:
       name: "An-important-host-with-reserved-IP"
       ip: 192.168.1.15
       # the 'link' property accepts a basic golang template. Available variables are 'mac', 'name' and 'ip'
-      link: "http://{{ ip }}/landing/page"
+      # e.g. "http://{{ ip }}/landing/page"
+      link:
   dhcp_clients_friendly_names:
     - mac: dd:ee:aa:dd:bb:ee
       name: "This is a friendly name to label this host, even if it gets a dynamic IP"
       # the 'link' property accepts a basic golang template. Available variables are 'mac', 'name' and 'ip'
-      link: "http://{{ ip }}/landing/page/for/this/dynamic/host"
+      # e.g. "http://{{ ip }}/landing/page/for/this/dynamic/host"
+      link:
   log_dhcp: true
   log_web_ui: false
   # this addon uses "host_network: true" so the internal HTTP server will bind on the interface
@@ -96,11 +98,11 @@ schema:
       # the name in this case must be a valid hostname as per RFC 1123 since it is passed to dnsmasq
       # that will refuse to start if an invalid hostname format is used
       name: match(^[a-zA-Z0-9\-.]*$)
-      link: str
+      link: "str?"
   dhcp_clients_friendly_names:
     - mac: match(^([0-9A-Fa-f]{2}[:-]){5}([0-9A-Fa-f]{2})$)
       name: str
-      link: str
+      link: "str?"
   log_dhcp: bool
   log_web_ui: bool
   web_ui_port: int

rootfs/opt/bin/dnsmasq-dhcp-script.sh

@@ -88,7 +88,7 @@ ON CONFLICT(mac_addr) DO UPDATE SET
 EOF
 
     if [[ $? -eq 0 ]]; then
-        log_info "Stored in trackerDB updated information for client mac=$mac_addr, hostname=$hostname: last_seen=$last_seen, Ddhcp_server_start_epoch=$dhcp_server_start_counter"
+        log_info "Stored in trackerDB updated information for client mac=$mac_addr, hostname=$hostname: last_seen=$last_seen, dhcp_server_start_epoch=$dhcp_server_start_counter"
     else
         log_error "Failed to add/update client. Expect inconsistencies."
     fi