Question

我正在尝试从dweet.io转换到我自己的InfluxDB数据库。

我对dweet.io所做的请求看起来像这样：

client.print(String("GET /dweet/for/nJLDK4mm3Xl6TcT8Yr06?key=7hHa9AhSGp6u684LGfya4Y&temperature=") + String(t) + "&humidity=" + String(h) + " HTTP/1.1\r\n" +
    "Host: " + host + "\r\n" +
    "Connection: close\r\n\r\n");
delay(10);

所以我虽然我可以编辑它来处理数据库，但我尝试了这个：

client.print(String("GET /write?db=mydb' --data-binary 'temperature,host=ESP826601 value=") + String(t) + "' HTTP/1.1\r\n" + 
    "Host: " + host + "\r\n" + 
    "Connection: close\r\n\r\n");
delay(10);

它没有工作，它能够连接到服务器，但无法提出请求。我的代码基于：https://www.openhomeautomation.net/cloud-temperature-logger-esp8266/

Answer 1

从ESP8266或ESP32向InfluxDB发送数据的更方便的方法是使用HTTPclient库而不是WiFiClient。以下代码设置标头和有效负载，然后通过其REST API将其发送到InfluxDB。

#include <ESP8266HTTPClient.h>

const char* influxUrl = "http://localhost:8086/write?db=mydb";
const char* influxUser = "username";
const char* influxPassword = "password";

// Add your own sensors here, e.g., read from OneWire or ADC
id[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
value[10] = {22, 25, 24, 21, 22, 26, 22, 25, 24, 21};

// Send to InfluxDB
Serial.println("Sending data to InfluxDB");

String influxData = "";
for(int i = 0; i < 10; i++){
  // Set data type and add tags
  influxData += "air_temperature,house=hydroponic,id=" + id[i];
  // Add temperature value and delimiter for next measurement
  influxData += " value=" + String(value[i]) + "\n";
}

// Create POST message
http.begin(influxUrl);
http.addHeader("Content-Type", "application/x-www-form-urlencoded");
http.setAuthorization(influxUser, influxPassword);

// The first attempt to send returns -1
int httpCode = -1;
while(httpCode == -1){
  httpCode = http.POST(influxData);
  http.writeToStream(&Serial);
}
http.end();

作为奖励，将它与ESP的deep sleep功能相结合是有意义的，可将功耗从80mA降至10mA以下（根据我的测量，限制为0.01A）。 / p>

注意：上面的代码是从较大的项目中提取的，因此转录中可能有一两个错误。

通过ESP8266将POST请求传递给InfluxDB

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