Ap settngs post working, error msg on response

platform_shared/api.options

@@ -2,3 +2,5 @@ api.APSettings.ssid max_size:33
 api.APSettings.password max_size:64
 
 api.APStatus.mac_address max_size:18
+
+api.Response.error_message type:FT_POINTER

platform_shared/api.proto

@@ -59,6 +59,7 @@ message Request {
 // Response wrapper for REST endpoints
 message Response {
     uint32 status_code = 1;
+    string error_message = 2;
 
     oneof payload {
         APSettings ap_settings = 10;