Arduino 通过api接口 post 数据

1.url编码形式Post数据

• 示例代码

#include 
#include 
#include "arduino_secrets.h"

///please enter your sensitive data in the Secret tab/arduino_secrets.h
/// Wifi Settings ///
char ssid[] = SECRET_SSID;
char pass[] = SECRET_PASS;

char serverAddress[] = "192.168.0.3";  // server address
int port = 8080;

WiFiClient wifi;
HttpClient client = HttpClient(wifi, serverAddress, port);
int status = WL_IDLE_STATUS;

void setup() {
  Serial.begin(9600);
  while ( status != WL_CONNECTED) {
    Serial.print("Attempting to connect to Network named: ");
    Serial.println(ssid);                   // print the network name (SSID);

    // Connect to WPA/WPA2 network:
    status = WiFi.begin(ssid, pass);
  }

  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);
}

void loop() {
  Serial.println("making POST request");
  String contentType = "application/x-www-form-urlencoded";
  String postData = "name=Alice&age=12";

  client.post("/", contentType, postData);

  // read the status code and body of the response
  int statusCode = client.responseStatusCode();
  String response = client.responseBody();

  Serial.print("Status code: ");
  Serial.println(statusCode);
  Serial.print("Response: ");
  Serial.println(response);

  Serial.println("Wait five seconds");
  delay(5000);
}

2.JSON格式Post数据

• 示例代码

#include 
#include 
#include 

void setup() {
  Serial.begin(115200);                            //Serial connection
  WiFi.begin("UU", "1212312121");   //WiFi connection
  while (WiFi.status() != WL_CONNECTED) {  //Wait for the WiFI connection completion
    delay(500);
    Serial.println("Waiting for connection");
 }
} 

void loop() {
  int sensor_value = 45;
  if (WiFi.status() == WL_CONNECTED) { //Check WiFi connection status
  String json = "{\"sensor\":\"gps\",\"value\":\""+ String(sensor_value) +"\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
  DynamicJsonBuffer  jsonBuffer;
  char postMessage[300]; 
  JsonObject& root = jsonBuffer.createObject();
  JsonObject& Jarray = jsonBuffer.parseObject(json); 
  root["name"] = "lll";
  root["content"] = Jarray;
  root.printTo(postMessage,sizeof(postMessage));
  Serial.print(postMessage);
  
//----------------------------------------------------------
         HTTPClient http;
         http.begin("http://iot.data.ubu.ac.th/api/save" );      
         http.addHeader("Content-Type", "application/json");
         int httpCode = http.POST(postMessage);

    String payload = http.getString();                                        //Get the response payload
    Serial.println(httpCode);   //Print HTTP return code
    Serial.println(payload);    //Print request response payload
    http.end();  //Close connection
  }
 else {
    Serial.println("Error in WiFi connection");
  }
  delay(3000);  //Send a request every 30 seconds
}

• 通过api接口post数据，数据格式可以有url编码，json格式，text文本格式，表单参数等各种形式，有些接口不限制数据格式，有些会限制，比如只允许JSON格式