From 0d1676a53f999fe4349bbea363497cfaf4ed78da Mon Sep 17 00:00:00 2001
From: "Rysiek Labus (SQ9MDD)" <rysieklabus@gmail.com>
Date: Thu, 17 Jul 2025 20:56:31 +0200
Subject: [PATCH] Update serial_no.yaml

---
 devices/serial_no.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/devices/serial_no.yaml b/devices/serial_no.yaml
index bdc51a0..8c1dff8 100644
--- a/devices/serial_no.yaml
+++ b/devices/serial_no.yaml
@@ -4,7 +4,7 @@ text_sensor:
     id: serial_no
     lambda: |-
       std::string mac = get_mac_address();
-      return to_string("${serial_prefix}") + mac.erase(0, mac.length()/2);
+      return std::string("${serial_prefix}") + mac.substr(mac.length()/2);
     icon: mdi:expansion-card-variant
     entity_category: diagnostic
     update_interval: 60min