總思路
onenet的API開發指南:“平臺提供開放的API接口,用戶可以通過HTTP/HTTPS調用,進行設備管理,數據查詢,設備命令交互等操作,在API的基礎上,根據自己的個性化需求搭建上層應用。”
所以只需要讓ESP-12E按照onenet的API調用規範上傳數據點,小程序按規範查詢數據點,即能實現數據從ESP到達小程序。反過來小程序上傳、ESP查詢數據也一樣。ESP12E和小程序作爲兩個客戶端,需要做的就是能夠發起HTTP請求(不限於上述兩者,只要是能發起HTTP請求的客戶端都能加入這個通信)。
上傳數據點(POST方法)
查詢數據(GET方法)
Onenet工作
創建一個“HTTP”協議的產品,並創建設備,記下設備號。然後隨便建立一個數據流模板,我的叫“temp”
ESP12-E
用了ESP8266WiFi這個庫,可以提供連接WiFi和進行HTTP訪問的API。
只是簡單的修改了“示例”內的“ESP8266WiFi”的“WiFiClient”
註釋了查詢數據的部分(GET)
#include <ESP8266WiFi.h>
const char* ssid = "Medi";//wifi用戶名
const char* password = "88888889";
const char* host = "api.heclouds.com";//
void setup() {
Serial.begin(115200);
delay(10);
// We start by connecting to a WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
int value = 0;
void loop() {
delay(5000);
++value;
Serial.print("connecting to ");
Serial.println(host);
// Use WiFiClient class to create TCP connections
WiFiClient client;
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
return;
}
// We now create a URI for the request
/*GET
String url = "/devices/你的設備號/datapoints?datastream_id=temp";
*/
//POST的URL
String url = "/devices/你的設備號/datapoints";
Serial.print("Requesting URL: ");
Serial.println(url);
/*
// 發起請求,注意空格!
client.print(String("GET ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"api-key: lkyLlylsKq00Iv9ZsAwylV7VTp4="+ "\r\n" +
"Connection: close\r\n\r\n");
*/
//contentlength必須加,\r\n算兩個字符,Connection: close要不要無所謂
client.print(String("POST ") + url + " HTTP/1.1\r\n" +
"Host:" + host + "\r\n" +
"api-key:lkyLlylsKq00Iv9ZsAwylV7VTp4="+ "\r\n" +
"Content-Length: 60"+"\r\n" +
"Connection: close\r\n\r\n"
+"{\"datastreams\":[{\"id\":\"temp\",\"datapoints\":[{\"value\":6}]}]}"+"\r\n"
);
unsigned long timeout = millis();
while (client.available() == 0) {
if (millis() - timeout > 5000) {
Serial.println(">>> Client Timeout !");
client.stop();
return;
}
}
// Read all the lines of the reply from server and print them to Serial
while(client.available()){
String line = client.readStringUntil('\r');
Serial.print(line);
}
Serial.println();
Serial.println("closing connection");
}
WeApp
微信小程序內代碼相對簡潔了,因爲封裝程度更高。
Page({
onLoad:function(){
/*上傳數據點(POST)
wx.request({
url: 'https://api.heclouds.com/devices/你的設備號/datapoints',
method:"POST",
header:{
"api-key":"lkyLlylsKq00Iv9ZsAwylV7VTp4="
},
data:{
"datastreams": [{
"id": "temp",
"datapoints": [{ "value": 80 }, { "value": 2 }, { "value": 3 }, { "value": 4 }]
}]
},
success(res) {
console.log(res.data)
}
})
*/
//查詢數據點(GET)
wx.request({
url: 'https://api.heclouds.com/devices/你的設備號/datapoints?datastream_id=temp',
method: "GET",
header: {
"api-key": "lkyLlylsKq00Iv9ZsAwylV7VTp4="
},
success(res) {
console.log(res.data.data.datastreams[0].datapoints[0])
}
})
}
})