From 3a81c7001823dae498f022c5e1ccd0df1a53f45b Mon Sep 17 00:00:00 2001
From: proddy <paul@derbyshire.nl>
Date: Wed, 5 Aug 2026 15:43:30 +0200
Subject: [PATCH] add DHCP workaround (disabled for now)

---
 src/core/network.cpp | 11 +++++++++++
 src/core/network.h   |  1 +
 2 files changed, 12 insertions(+)

diff --git a/src/core/network.cpp b/src/core/network.cpp
index 96fc2f50d..3eee3ae14 100644
--- a/src/core/network.cpp
+++ b/src/core/network.cpp
@@ -539,6 +539,17 @@ void Network::startEthernet() {
         return;
     }
 
+    /*
+    // The Tasmota SDK is built with CONFIG_ESP32_UNIVERSAL_MAC_ADDRESSES=2, so the Ethernet MAC is derived as
+    // a locally-administered address from base+1 instead of the universal base+3 that Arduino Core 2 used.
+    // Seed the MAC table with the old value before the EMAC driver reads it, so DHCP reservations survive an upgrade.
+    uint8_t eth_mac[6];
+    if (esp_read_mac(eth_mac, ESP_MAC_BASE) == ESP_OK) {
+        eth_mac[5] += 3;
+        esp_iface_mac_addr_set(eth_mac, ESP_MAC_ETH);
+    }
+    */
+
     // reset power and add a delay as ETH doesn't not always start up correctly after a warm boot
     if (eth_power_ != -1) {
         pinMode(eth_power_, OUTPUT);
diff --git a/src/core/network.h b/src/core/network.h
index 92da60be3..d081f0232 100644
--- a/src/core/network.h
+++ b/src/core/network.h
@@ -20,6 +20,7 @@
 #define EMSESP_NETWORK_H_
 
 #ifndef EMSESP_STANDALONE
+#include <esp_mac.h>
 #include <esp_wifi.h>
 #include <ETH.h>
 #include <WiFi.h>