implement fallback to wifi if W5500 hardware not present

Network.cpp

@@ -8,6 +8,8 @@
 
 Network* Network::_inst = nullptr;
 
+RTC_NOINIT_ATTR char WiFi_fallbackDetect[14];
+
 Network::Network(const NetworkDeviceType networkDevice, Preferences *preferences, const String& maintenancePathPrefix)
 : _preferences(preferences)
 {
@@ -25,8 +27,14 @@ Network::Network(const NetworkDeviceType networkDevice, Preferences *preferences
 }
 
 
-void Network::setupDevice(const NetworkDeviceType hardware)
+void Network::setupDevice(NetworkDeviceType hardware)
 {
+    if(strcmp(WiFi_fallbackDetect, "wifi_fallback") == 0)
+    {
+        Log->println(F("Switching to WiFi device as fallabck."));
+        hardware = NetworkDeviceType::WiFi;
+    }
+
     switch(hardware)
     {
         case NetworkDeviceType::W5500:
@@ -119,8 +127,25 @@ int Network::update()
         }
 
         Log->println(F("Network not connected. Trying reconnect."));
-        bool success = _device->reconnect();
-        Log->println(success ? F("Reconnect successful") : F("Reconnect failed"));
+        ReconnectStatus reconnectStatus = _device->reconnect();
+
+        switch(reconnectStatus)
+        {
+            case ReconnectStatus::CriticalFailure:
+                strcpy(WiFi_fallbackDetect, "wifi_fallback");
+                Log->println("Network device has a critical failure, enable fallback to Wifi and reboot.");
+                delay(200);
+                ESP.restart();
+                break;
+            case ReconnectStatus::Success:
+                memset(WiFi_fallbackDetect, 0, sizeof(WiFi_fallbackDetect));
+                Log->println(F("Reconnect successful"));
+                break;
+            case ReconnectStatus::Failure:
+                Log->println(F("Reconnect failed"));
+                break;
+        }
+
     }
 
     if(!_device->isConnected())

Network.h

@@ -49,7 +49,7 @@ public:
 private:
     static void onMqttDataReceivedCallback(char* topic, byte* payload, unsigned int length);
     void onMqttDataReceived(char*& topic, byte*& payload, unsigned int& length);
-    void setupDevice(const NetworkDeviceType hardware);
+    void setupDevice(NetworkDeviceType hardware);
     bool reconnect();
 
     void buildMqttPath(const char* prefix, const char* path, char* outPath);

lib/Ethernet/docs/api.md

@@ -332,7 +332,7 @@ void setup() {
   Serial.begin(9600);
   // start the Ethernet connection:
   if (Ethernet.begin(mac) == 0) {
-    Serial.println("Failed to configure Ethernet using DHCP");
+    Serial.println("Failure to configure Ethernet using DHCP");
     // no point in carrying on, so do nothing forevermore:
     for(;;)
       ;

lib/NimBLE-Arduino/CHANGELOG.md

@@ -7,7 +7,7 @@ All notable changes to this project will be documented in this file.
 ### Fixed
  - Compile warning removed for esp32c3
  - NimBLEDevice::getPower incorrect value when power level is -3db.
- - Failed pairing when already in progress.
+ - Failure pairing when already in progress.
 
 ### Changed
  - Revert previous change that forced writing with response when subscribing in favor of allowing the application to decide.

networkDevices/NetworkDevice.h

@@ -2,6 +2,13 @@
 
 #include "PubSubClient.h"
 
+enum class ReconnectStatus
+{
+    Failure = 0,
+    Success = 1,
+    CriticalFailure = 2
+};
+
 class NetworkDevice
 {
 public:
@@ -12,7 +19,7 @@ public:
     virtual PubSubClient* mqttClient() = 0;
 
     virtual void initialize() = 0;
-    virtual bool reconnect() = 0;
+    virtual ReconnectStatus reconnect() = 0;
     virtual void reconfigure() = 0;
     virtual void printError() = 0;
 

networkDevices/W5500Device.cpp

@@ -57,8 +57,7 @@ void W5500Device::initialize()
     reconnect();
 }
 
-
-bool W5500Device::reconnect()
+ReconnectStatus W5500Device::reconnect()
 {
     _hasDHCPAddress = false;
 
@@ -66,6 +65,7 @@ bool W5500Device::reconnect()
     Log->println(F("Initialize Ethernet with DHCP:"));
 
     int dhcpRetryCnt = 0;
+    bool hardwareFound = false;
 
     while(dhcpRetryCnt < 3)
     {
@@ -81,12 +81,15 @@ bool W5500Device::reconnect()
             if (Ethernet.hardwareStatus() == EthernetNoHardware)
             {
                 Log->println(F("Ethernet module not found"));
+                continue;
             }
             if (Ethernet.linkStatus() == LinkOFF)
             {
                 Log->println(F("Ethernet cable is not connected."));
             }
 
+            hardwareFound = true;
+
             IPAddress ip;
             ip.fromString("192.168.4.1");
 
@@ -108,7 +111,12 @@ bool W5500Device::reconnect()
         }
     }
 
-    return _hasDHCPAddress;
+    if(!hardwareFound)
+    {
+        return ReconnectStatus::CriticalFailure;
+    }
+
+    return _hasDHCPAddress ? ReconnectStatus::Success : ReconnectStatus::Failure;
 }
 
 

networkDevices/W5500Device.h

@@ -11,7 +11,7 @@ public:
     ~W5500Device();
 
     virtual void initialize();
-    virtual bool reconnect();
+    virtual ReconnectStatus reconnect();
     virtual void reconfigure();
     virtual void printError();
 

networkDevices/WifiDevice.cpp

@@ -126,10 +126,10 @@ bool WifiDevice::isConnected()
     return WiFi.isConnected();
 }
 
-bool WifiDevice::reconnect()
+ReconnectStatus WifiDevice::reconnect()
 {
     delay(3000);
-    return isConnected();
+    return isConnected() ? ReconnectStatus::Success : ReconnectStatus::Failure;
 }
 
 void WifiDevice::update()

networkDevices/WifiDevice.h

@@ -13,7 +13,7 @@ public:
 
     virtual void initialize();
     virtual void reconfigure();
-    virtual bool reconnect();
+    virtual ReconnectStatus reconnect();
     virtual void printError();
 
     virtual void update();