Add select for relays

central_frontend/src/api/RelayApi.ts

@@ -0,0 +1,16 @@
+import { APIClient } from "./ApiClient";
+import { DeviceRelay } from "./DeviceApi";
+
+export class RelayApi {
+  /**
+   * Get the full list of relays
+   */
+  static async GetList(): Promise<DeviceRelay[]> {
+    return (
+      await APIClient.exec({
+        method: "GET",
+        uri: "/relays/list",
+      })
+    ).data;
+  }
+}