Read now works, and terraform directory contains example code

terraform/outputs.tf

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+output "system_description" {
+  description = "Everything read back from the switch's System Description page."
+  value       = data.hpe1810_system_description.this
+}
+
+output "system_name" {
+  value = data.hpe1810_system_description.this.name
+}
+
+output "port_summary" {
+  value = data.hpe1810_port_summary.this.ports
+}
+
+output "port_24" {
+  description = "The uplink port -- verifying it's readable without touching it."
+  value       = [for p in data.hpe1810_port_summary.this.ports : p if p.Interface == "24"]
+}
+
+output "mac_table" {
+  value = data.hpe1810_mac_table.this
+}