下面的草图在使用DHCP时工作正常,但在使用静态IP时,HTTPClient.begin()始终返回拒绝连接。以下是如何测试这个问题...如果只是这一行:
WiFi.config(local_IP, gateway, subnet);
包含HTTPClient将无法正常工作,但如果此行被注释掉,它将连接到服务器并返回该字符串就好了。我已经看过几次这个问题,但从来没有得到一个好的答案。有没有办法让HTTPClient与静态IP一起使用?使用带有DHCP或固定IP的ESP32 WebServer库工作正常,只有这个HTTPClient库不能同时使用固定和DHCP。无论是在ESP32还是ESP8266上使用,行为都是相同的。谢谢你的帮助。
#include <Arduino.h>
#include <WiFi.h>
#include <WiFiMulti.h>
#include <HTTPClient.h>
#define USE_SERIAL Serial
WiFiMulti wifiMulti;
IPAddress local_IP(192, 168, 1, 111);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 0);
void setup() {
USE_SERIAL.begin(115200);
WiFi.begin("networkSSID", "myPassword");
WiFi.config(local_IP, gateway, subnet);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void loop() {
if (WiFi.status() == WL_CONNECTED) {
HTTPClient http;
http.begin("http://www.mocky.io/v2/5c7ddbb13100006c0037600d");
int httpCode = http.GET();
if (httpCode > 0) {
// HTTP header has been send and Server response header has been handled
USE_SERIAL.printf("[HTTP] GET... code: %d\n", httpCode);
if (httpCode == HTTP_CODE_OK) {
String payload = http.getString();
USE_SERIAL.println(payload);
}
} else {
USE_SERIAL.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
}
http.end();
}
Serial.println(WiFi.localIP());
delay(5000);
}
我无法100%肯定(现在无法测试),但这听起来像是你错过了DNS解析。
试试这个
...
IPAddress local_IP(192, 168, 1, 111);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 0);
IPAddress dns(8, 8, 8, 8); // Google DNS
void setup() {
USE_SERIAL.begin(115200);
WiFi.begin("networkSSID", "myPassword");
WiFi.config(local_IP, gateway, subnet, dns);
...