从esp8266向本地服务器发送有限的JSON数据,可以通过以下步骤实现:
以下是一个示例代码,演示如何实现上述步骤:
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>
#include <FS.h>
const char* ssid = "YourWiFiSSID";
const char* password = "YourWiFiPassword";
const char* serverIP = "YourServerIP";
const int serverPort = 80;
void setup() {
Serial.begin(115200);
// 连接到WiFi网络
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
}
Serial.println("Connected to WiFi");
// 挂载SPIFFS文件系统
if (!SPIFFS.begin()) {
Serial.println("Failed to mount file system");
return;
}
// 创建JSON数据
DynamicJsonDocument jsonDoc(1024);
jsonDoc["sensor"] = "temperature";
jsonDoc["value"] = 25.5;
// 将JSON数据保存到SPIFFS中
File jsonFile = SPIFFS.open("/data.json", "w");
if (!jsonFile) {
Serial.println("Failed to open file for writing");
return;
}
serializeJson(jsonDoc, jsonFile);
jsonFile.close();
// 建立HTTP连接并发送JSON数据
HTTPClient http;
http.begin("http://" + String(serverIP) + ":" + String(serverPort) + "/endpoint");
http.addHeader("Content-Type", "application/json");
File file = SPIFFS.open("/data.json", "r");
if (!file) {
Serial.println("Failed to open file for reading");
return;
}
int fileSize = file.size();
std::unique_ptr<char[]> buf(new char[fileSize]);
file.readBytes(buf.get(), fileSize);
file.close();
int httpResponseCode = http.POST(buf.get(), fileSize);
if (httpResponseCode > 0) {
String response = http.getString();
Serial.println("Server response: " + response);
} else {
Serial.println("Error sending POST request");
}
http.end();
}
void loop() {
// 主循环中的其他代码
}
请注意,上述示例代码仅为演示目的,实际应用中可能需要根据具体情况进行适当修改。
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