Implement and document Arduino software

source/arduino/wifi.cpp

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+/*
+Copyright (c):
+
+Philipp Matthias Schäfer (philipp.matthias.schaefer@posteo.de), 2020
+
+This file is part of the KrautStatus' Arduino code.
+
+The Clean CommonMark library is free software: you can redistribute it and/or
+modify it under the terms of the GNU Affero General Public License as published
+by the Free Software Foundation, either version 3 of the License, or (at your
+option) any later version.
+
+The Clean CommonMark library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
+for more details.
+
+You should have received a copy of the GNU Affero General Public License along
+with the Clean CommonMark library. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <SPI.h>
+#include <WiFi101.h>
+#include <WiFiUdp.h>
+
+#include "config.h"
+
+WiFiUDP Udp;
+
+void print_mac_address() {
+  uint8_t mac[6];
+  WiFi.macAddress(mac);
+  Serial.print("MAC: ");
+  for(unsigned int i = 5; i > 0; --i) {
+    Serial.print(mac[i], HEX);
+    Serial.print(":");
+  }
+  Serial.println(mac[0], HEX);
+}
+
+boolean wifi_setup() {
+  if (WiFi.status() == WL_NO_SHIELD) {
+    Serial.println("No WiFI shield present");
+    return false;
+  }
+
+  print_mac_address();
+
+  while (true) {
+    Serial.print("Connecting to SSID: ");
+    Serial.println(SSID);
+
+    if (WiFi.begin(SSID, PASSWORD) == WL_CONNECTED) {
+      break;
+    }
+
+    delay(10000);
+  }
+
+  Serial.println("Connect to WiFi");
+  Serial.print("IP Address: ");
+  Serial.println(WiFi.localIP());
+
+  Udp.begin(SERVER_PORT);
+
+  return true;
+}