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ESP8266 DNS lookup failure example
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| #include <ESP8266WiFi.h> | |
| #include <ESP8266HTTPClient.h> | |
| #define WIFI_SSID "MySSID" | |
| #define WIFI_KEY "MyKey" | |
| void setup() { | |
| Serial.begin(115200); | |
| delay(500); | |
| Serial.println(); | |
| Serial.println("Initialising wifi"); | |
| WiFi.begin(WIFI_SSID, WIFI_KEY); | |
| while((WiFi.status() != WL_CONNECTED)) { | |
| delay(100); | |
| Serial.print("."); | |
| } | |
| Serial.println(""); | |
| Serial.println("WiFi connected"); | |
| testGet(); | |
| //testDnsLookup(); | |
| WiFi.disconnect(); | |
| } | |
| void testGet() { | |
| HTTPClient http; | |
| http.begin("http://www.google.com"); | |
| long startTime = millis(); | |
| int httpCode = http.GET(); | |
| Serial.printf("[Get] [%dms] First try code %d, error message: %s\n", millis() - startTime, httpCode, http.errorToString(httpCode).c_str()); | |
| httpCode = http.GET(); | |
| Serial.printf("[Get] [%dms] Second try code %d, error message: %s\n", millis() - startTime, httpCode, http.errorToString(httpCode).c_str()); | |
| } | |
| void testDnsLookup() { | |
| Serial.println("Starting lookup"); | |
| long startTime = millis(); | |
| IPAddress serverIP; | |
| WiFi.hostByName("www.google.com", serverIP); | |
| Serial.printf("[DNS] [%dms] Finished lookup", millis() - startTime); | |
| } | |
| void loop() {} |
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