Plenty of writes now works and an expanded example exists in the terraform directory

terraform/variables.tf

@@ -0,0 +1,12 @@
+# Port number (as a string, e.g. "5") -> desired config. NEVER include the
+# admin_port here (default 24, see provider.tf) -- hpe1810_port refuses to
+# write to it anyway (see resource_port.go's guardAdminPort), but it's
+# clearer to just never ask for it.
+variable "ports" {
+  description = "Port number -> desired Admin Mode / Link Speed."
+  type = map(object({
+    admin_mode = bool
+    link_speed = string
+  }))
+  # No default -- set actual values in terraform.tfvars (or -var-file/-var).
+}