Connect to WiFi and draft of uptime testing

Co-authored-by: x <xbr@c3l.lu>

.gitignore

@@ -1,2 +1,3 @@
 .pio
 compile_commands.json
+.vscode

src/main.cpp

@@ -1,18 +1,57 @@
 #include <Arduino.h>
+#include <ESP8266WiFi.h>
+#include <WiFiUdp.h>
 
 #define RELAY 4 // GPIO4
+#define WIFI_NAME "TechInc"
+#define WIFI_PASSWORD "itoldyoualready"
+#define ROOT_DNS_IP "193.0.14.129"
+
+const IPAddress root_dns_ip(193, 0, 14, 129);
+
+bool testDNS() {
+  WiFiUDP udp;
+  udp.beginPacket(root_dns_ip, 53);
+  return true;
+}
+
+bool testHTTP() {
+  return true;
+}
+
+// Returns true if Internet works
+bool uplinkWorks() {
+  return testDNS() || testHTTP();
+}
 
 void setup() {
+  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
   Serial.begin(9600);
+
+  Serial.print("Connecting to WiFi");
+  while (WiFi.status() != WL_CONNECTED)
+  {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println();
+
+  Serial.print("Connected, IP address: ");
+  Serial.println(WiFi.localIP());
+
   pinMode(LED_BUILTIN, OUTPUT);
   pinMode(RELAY, OUTPUT);
 }
 
 void loop() {
-  digitalWrite(LED_BUILTIN, HIGH);
-  digitalWrite(RELAY, HIGH);
-  delay(1000);
-  digitalWrite(LED_BUILTIN, LOW);
-  digitalWrite(RELAY, LOW);
-  delay(1000);
+  if(uplinkWorks()) {
+    Serial.println("Network is up");
+    digitalWrite(LED_BUILTIN, HIGH);
+    digitalWrite(RELAY, HIGH);
+  } else {
+    Serial.println("Network is down");
+    digitalWrite(LED_BUILTIN, LOW);
+    digitalWrite(RELAY, LOW);
+  }
+  delay(1000); // TODO: cleaner interval between tests
 }