Arduino MKR1000如何将消息发送到Azure IoT中心

Question

[我正在尝试设置一个从Arduino MKR1000向Azure IOT Event Hub发送消息的基本示例，但似乎无法使任何在线示例正常工作，并且我是Arduino的新手。

是否有简单示例的指针？

我尝试了此示例，并稍作更改以发布消息而不是接收消息但没有运气。我可以毫无问题地连接到Wifi，仅在发布HTTP请求时出现错误，并显示“ HTTP错误411。该请求必须分块或具有内容长度”。它似乎也不是最干净的方法，但我只是不想立即开始一些基本的操作：）

代码示例：

#include <SPI.h>
#include <WiFi101.h>

#include "arduino_secrets.h"

///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID;        // your network SSID (name)
char pass[] = SECRET_PASS;    // your network password (use for WPA, or use as key for WEP)

const int MKR1000_LED = 6 ;


///*** Azure IoT Hub Config ***///
//see: http://mohanp.com/  for details on getting this right if you are not sure.

char hostname[] = "*****.azure-devices.net";    // host name address for your Azure IoT Hub
char feeduri[] = "/devices/MKR1000/messages/events?api-version=2018-06-30"; //feed URI
char authSAS[] = "SharedAccessSignature sr=******.azure-devices.net%2Fdevices%2FMKR1000&sig=*****&se=******";

///*** Azure IoT Hub Config ***///

unsigned long lastConnectionTime = 0;
const unsigned long pollingInterval = 5L * 1000L; // 5 sec polling delay, in milliseconds

int status = WL_IDLE_STATUS;

WiFiSSLClient client;

void setup() {
  Serial.println("setup...");
  pinMode(MKR1000_LED, OUTPUT);

  //check for the presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
    // don't continue:
    while (true);
  }

  // attempt to connect to Wifi network:
  while (status != WL_CONNECTED) {
    status = WiFi.begin(ssid, pass);
    // wait 10 seconds for connection:
    delay(10000);
  }
  Serial.println("Wifi connected...");
}

void loop()
{
  String response = "";
  char c;
  ///read response if WiFi Client is available
  while (client.available()) {
    c = client.read();
    response.concat(c);
  }

  if (!response.equals(""))
  {
    Serial.println(response);
    //if there are no messages in the IoT Hub Device queue, Azure will return 204 status code.
    if (response.startsWith("HTTP/1.1 204"))
    {
      //turn off onboard LED
      digitalWrite(MKR1000_LED, LOW);
    }
    else
    {
      //turn on onboard LED
      digitalWrite(MKR1000_LED, HIGH);
    }
  }

  // polling..if pollingInterval has passed
  if (millis() - lastConnectionTime > pollingInterval) {
    digitalWrite(MKR1000_LED, LOW);
    azureHttpRequest("{TEST MESSAGE!}");
  }
}

// this method makes an HTTPS connection to the Azure IOT Hub Server:
void azureHttpRequest(String data) {

  // close any connection before send a new request.
  // This will free the socket on the WiFi shield
  client.stop();

  // if there's a successful connection:
  if (client.connect(hostname, 443)) {
    //make the GET request to the Azure IOT device feed uri
    client.print("POST ");  //Do a GET
    client.print(feeduri);  // On the feedURI
    client.println(" HTTP/1.1");
    client.print("Host: ");
    client.println(hostname);  //with hostname header
    client.print("Authorization: ");
    client.println(authSAS);  //Authorization SAS token obtained from Azure IoT device explorer
    //client.println("Connection: close");
    client.println("Content-Type: application/json");
    client.println("Content-Length: " + data.length());
    client.println("\r\n\r\n" + data);



    // note the time that the connection was made:
    lastConnectionTime = millis();
  }
  else {
    // if you couldn't make a connection:
    Serial.println("connection failed");
  }
}

编辑：我已经看到有一个完整的Azure IOT库，其中包含一个简单的HTTP示例，但是它也没有运行（它通过wifi连接并无法通过调用azure进行调用），但是此示例项目相当大，并且我希望可以建立一个简单的例子！

https://github.com/Azure/azure-iot-arduino

Answer 1

您在这里有一个现成的示例：https://github.com/firedog1024/mkr1000-iotc。

请注意，它使用Azure IoT设备置备服务进行置备，因此您需要setup a DPS instance与IoT中心一起使用。