From e52d4566ba469507ff0fa9b3d5708cae76261c7f Mon Sep 17 00:00:00 2001
From: Ricardo Guzman <richon2001@hotmail.com>
Date: Wed, 23 Sep 2026 12:39:07 -0300
Subject: [PATCH] WiFi loop protection

---
 include/network_manager.h | 3 +++
 src/network_manager.cpp   | 4 ++++
 src/tnc_utils.cpp         | 4 +++-
 src/web_utils.cpp         | 4 +++-
 src/wifi_utils.cpp        | 3 +++
 5 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/include/network_manager.h b/include/network_manager.h
index 512fc52..06fa393 100644
--- a/include/network_manager.h
+++ b/include/network_manager.h
@@ -96,4 +96,7 @@ public:
     bool isModemConnected() const;
 
     bool isWifiAPActive() const;
+
+    // Check if any network interface was started (lwip TCP/IP stack is initialized)
+    bool hasActiveInterface() const;
 };
diff --git a/src/network_manager.cpp b/src/network_manager.cpp
index 83a4155..3872fbb 100644
--- a/src/network_manager.cpp
+++ b/src/network_manager.cpp
@@ -339,6 +339,10 @@ bool NetworkManager::isWifiAPActive() const {
     return _wifiAPmode;
 }
 
+bool NetworkManager::hasActiveInterface() const {
+    return _wifiSTAmode || _wifiAPmode || _ethernetMode;
+}
+
 // Check if Ethernet is connected
 bool NetworkManager::isEthernetConnected() const {
     return _ethernetMode && _ethernetConnected && ETH.linkUp();
diff --git a/src/tnc_utils.cpp b/src/tnc_utils.cpp
index 99f6328..48f326a 100644
--- a/src/tnc_utils.cpp
+++ b/src/tnc_utils.cpp
@@ -18,6 +18,7 @@
 
 #include <WiFi.h>
 #include "ESPmDNS.h"
+#include "network_manager.h"
 #include "configuration.h"
 #include "station_utils.h"
 #include "kiss_protocol.h"
@@ -28,6 +29,7 @@
 
 
 extern Configuration    Config;
+extern NetworkManager   *networkManager;
 extern WiFiClient       aprsIsClient;
 extern bool             passcodeValid;
 
@@ -47,7 +49,7 @@ String inputSerialBuffer = "";
 namespace TNC_Utils {
 
     void setup() {
-        if (Config.tnc.enableServer && Config.digi.ecoMode == 0) {
+        if (Config.tnc.enableServer && Config.digi.ecoMode == 0 && networkManager->hasActiveInterface()) {   // no WiFi STA/AP or Ethernet started = no TCP/IP stack
             tncServer.stop();
             tncServer.begin();
             String host = "igate-" + Config.callsign;
diff --git a/src/web_utils.cpp b/src/web_utils.cpp
index 87b4a55..4c7202c 100644
--- a/src/web_utils.cpp
+++ b/src/web_utils.cpp
@@ -17,6 +17,7 @@
  */
 
 #include <ArduinoJson.h>
+#include "network_manager.h"
 #include "configuration.h"
 #include "ota_utils.h"
 #include "web_utils.h"
@@ -26,6 +27,7 @@
 
 
 extern Configuration               Config;
+extern NetworkManager              *networkManager;
 extern uint32_t                    lastBeaconTx;
 extern std::vector<ReceivedPacket> receivedPackets;
 
@@ -435,7 +437,7 @@ namespace WEB_Utils {
     }
 
     void setup() {
-        if (Config.digi.ecoMode == 0) {
+        if (Config.digi.ecoMode == 0 && networkManager->hasActiveInterface()) {  // no WiFi STA/AP or Ethernet started = no TCP/IP stack
             server.on("/", HTTP_GET, handleHome);
             server.on("/status", HTTP_GET, handleStatus);
             server.on("/received-packets.json", HTTP_GET, handleReceivedPackets);
diff --git a/src/wifi_utils.cpp b/src/wifi_utils.cpp
index d4d1026..a9a180c 100644
--- a/src/wifi_utils.cpp
+++ b/src/wifi_utils.cpp
@@ -99,6 +99,9 @@ namespace WIFI_Utils {
             if (Config.wifiAutoAP.enabled) {
                 Serial.println("Starting AP fallback...");
                 startAutoAP();
+            } else {
+                Serial.println("AutoAP disabled: no network, WebUI/TNC server not started (reconfigure over USB)");
+                displayShow("", "  No WiFi / No AP", "  WebUI disabled", "     loading ...", 2000);
             }
             return;
         }