adding a function to get the dafault initialization values for NetworkSetting

Author: andreagilardoni

src/settings/settings.h

@@ -126,3 +126,5 @@ namespace models {
     };
   };
 }
+
+#include "settings_default.h"

src/settings/settings_default.h

@@ -0,0 +1,72 @@
+/*
+  This file is part of the Arduino_ConnectionHandler library.
+
+  Copyright (c) 2024 Arduino SA
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+#include "settings.h"
+
+namespace models {
+
+  /*
+   * if the cpp version is older than cpp14 then a constexpr function cannot include
+   * other than a simple return statement, thsu we can define it only as inline
+   */
+  #if __cplusplus > 201103L
+  constexpr NetworkSetting settingsDefault(NetworkAdapter type) {
+  #else
+  inline NetworkSetting settingsDefault(NetworkAdapter type) {
+  #endif
+
+    NetworkSetting res = {type};
+
+    switch(type) {
+    #if defined(BOARD_HAS_ETHERNET)
+    case NetworkAdapter::ETHERNET:
+        res.eth.timeout = 15000;
+        res.eth.response_timeout = 4000;
+        break;
+    #endif  //defined(BOARD_HAS_ETHERNET)
+
+    #if defined(BOARD_HAS_CATM1_NBIOT)
+    case NetworkAdapter::CATM1:
+      res.catm1.rat = 7; // CATM1
+      res.catm1.band = 0x04 | 0x80000 | 0x40000; // BAND_3 | BAND_20 | BAND_19
+      break;
+    #endif  //defined(BOARD_HAS_CATM1_NBIOT)
+
+    #if defined(BOARD_HAS_LORA)
+    case NetworkAdapter::LORA:
+      res.lora.band = 5; // _lora_band::EU868
+      res.lora.channelMask[0] = '\0';
+      res.lora.deviceClass = 'A'; // _lora_class::CLASS_A
+      break;
+    #endif  //defined(BOARD_HAS_LORA)
+
+    #if defined(BOARD_HAS_WIFI)
+    case NetworkAdapter::WIFI: // nothing todo, default optional values are fine with 0
+    #endif  //defined(BOARD_HAS_WIFI)
+
+    #if defined(BOARD_HAS_NB)
+    case NetworkAdapter::NB:  // nothing todo, default optional values are fine with 0
+    #endif  //defined(BOARD_HAS_NB)
+
+    #if defined(BOARD_HAS_GSM)
+    case NetworkAdapter::GSM: // nothing todo, default optional values are fine with 0
+    #endif  //defined(BOARD_HAS_GSM)
+
+    #if defined(BOARD_HAS_CELLULAR)
+    case NetworkAdapter::CELL: // nothing todo, default optional values are fine with 0
+    #endif  //defined(BOARD_HAS_CELLULAR)
+    default:
+      (void) 0;
+    }
+
+    return res;
+  }
+}