add a check for ethernet featherwing or hardware

Author: brentru

src/AdafruitIO_Ethernet.h

@@ -25,43 +25,53 @@
 #include "AdafruitIO.h"
 
 // all logic in .h to avoid auto compile
-class AdafruitIO_Ethernet : public AdafruitIO {
+class AdafruitIO_Ethernet : public AdafruitIO
+{
 
-  public:
-    AdafruitIO_Ethernet(const char *user, const char *key):AdafruitIO(user, key)
-    {
-      _client = new EthernetClient();
-      _mqtt = new Adafruit_MQTT_Client(_client, _host, _mqtt_port, _username, _key);
-      _http = new HttpClient(*_client, _host, _http_port);
-    }
-
-    aio_status_t networkStatus()
-    {
-      if(_status == AIO_NET_CONNECTED)
-        return _status;
+public:
+  AdafruitIO_Ethernet(const char *user, const char *key) : AdafruitIO(user, key)
+  {
+    _client = new EthernetClient();
+    _mqtt = new Adafruit_MQTT_Client(_client, _host, _mqtt_port, _username, _key);
+    _http = new HttpClient(*_client, _host, _http_port);
+  }
 
-      _connect();
+  aio_status_t networkStatus()
+  {
+    if (_status == AIO_NET_CONNECTED)
       return _status;
-    }
 
-    const char* connectionType()
-    {
-      return "ethernet_wing";
-    }
+    _connect();
+    return _status;
+  }
+
+  const char *connectionType()
+  {
+    return "ethernet_wing";
+  }
 
-  protected:
-    byte _mac[6] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
+protected:
+  byte _mac[6] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
 
-    EthernetClient *_client;
+  EthernetClient *_client;
 
-    void _connect()
+  void _connect()
+  {
+    if (Ethernet.begin(_mac) == 0)
     {
-      if(Ethernet.begin(_mac) == 0)
-        _status = AIO_NET_DISCONNECTED;
-      else
-        _status = AIO_NET_CONNECTED;
+      _status = AIO_NET_DISCONNECTED;
+      if (Ethernet.hardwareStatus() == EthernetNoHardware)
+      {
+        AIO_DEBUG_PRINTLN("Ethernet FeatherWing not found! Please recheck wiring connections.");
+        while (true)
+          delay(1); // do nothing, no point running without Ethernet hardware
+      }
     }
-
+    else
+    {
+      _status = AIO_NET_CONNECTED;
+    }
+  }
 };
 
 #endif // ADAFRUITIO_ETHERNET_H