Test the internet by TCP connecting to Google

src/main.cpp

@@ -1,36 +1,29 @@
 #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;
-}
+#define HTTP_HOST "google.com"
+#define HTTP_PORT (80)
 
 bool testHTTP() {
-  return true;
+  WiFiClient client;
+  client.setNoDelay(true);
+  bool available = client.connect(HTTP_HOST, HTTP_PORT);
+  client.stop();
+  return available;
 }
 
 // Returns true if Internet works
-bool uplinkWorks() {
-  return testDNS() || testHTTP();
-}
+bool uplinkWorks() { return testHTTP(); }
 
 void setup() {
   WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
   Serial.begin(9600);
 
   Serial.print("Connecting to WiFi");
-  while (WiFi.status() != WL_CONNECTED)
-  {
+  while (WiFi.status() != WL_CONNECTED) {
     delay(500);
     Serial.print(".");
   }
@@ -53,5 +46,5 @@ void loop() {
     digitalWrite(LED_BUILTIN, LOW);
     digitalWrite(RELAY, LOW);
   }
-  delay(1000); // TODO: cleaner interval between tests
+  delay(5000); // TODO: cleaner interval between tests
 }