中国移动OneNet平台上传GPS数据JSON格式

最终目的输出

POST /devices/3225187/datapoints HTTP/1.1
api-key: R9xO5NZm6oVI4YBHvCPKEqtwYtMA
Host: api.heclouds.com
Content-Length:81

{"datastreams":[{"id":"location","datapoints":[{"value":{"lon":106,"lat":29}}]}]}

1. 使用arduino代码组合出来HTTP头

使用OneNet官方提供的Httppacket库

#include <HttpPacket.h>

HttpPacketHead packet;

void setup() {
  // put your setup code here, to run once:

  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

    // put your main code here, to run repeatedly:
  // char *p = "{\"datastreams\":[{\"id\":\"sys_time\",\"datapoints\":[{\"value\":50}]}]}";
  char *p = "{\"datastreams\":[{\"id\":\"location\",\"datapoints\":[{\"value\":{\"lon\":106,\"lat\":29}}]}]}";

  packet.setHostAddress("api.heclouds.com");
  packet.setDevId("3225187");   //device_id
  packet.setAccessKey("R9xO5NZm6oVI4YBHvCPKEqtwYtMA");  //API_KEY
  // packet.setDataStreamId("<datastream_id>");    //datastream_id
  // packet.setTriggerId("<trigger_id>");
  // packet.setBinIdx("<bin_index>");

  /*create the http message about add datapoint */
  packet.createCmdPacket(POST, TYPE_DATAPOINT, p);
  if (strlen(packet.content))
    Serial.print(packet.content);
  Serial.print(p);
  Serial.println("\n");
}

2.使用JSON库合成JSON数据

#include <ArduinoJson.h>

void setup() {
  Serial.begin(9600);

  StaticJsonBuffer<200> jsonBuffer;

  JsonObject& lon_lat = jsonBuffer.createObject();
  lon_lat["lon"] = 106;
  lon_lat["lat"] = 29;

  JsonObject& value = jsonBuffer.createObject();
  value["value"] = lon_lat;

  JsonObject& id_datapoints = jsonBuffer.createObject();
  id_datapoints["id"] = "location";
  JsonArray& datapoints = id_datapoints.createNestedArray("datapoints");
  datapoints.add(value);

  JsonObject& myJson = jsonBuffer.createObject();
  JsonArray& datastreams = myJson.createNestedArray("datastreams");
  datastreams.add(id_datapoints);

  myJson.printTo(Serial);
  Serial.print("\r\n\r\n");

  //格式化输出
  myJson.prettyPrintTo(Serial);

  char p[200];
  Serial.print("\r\n---------\r\n");
  int num = myJson.printTo(p,sizeof(p));
  Serial.print(p);
  Serial.print("\r\n============\r\n");
  Serial.print(num);

}

void loop() {
  // not used in this example
}

串口输出效果

{"datastreams":[{"id":"location","datapoints":[{"value":{"lon":106,"lat":29}}]}]}

{
  "datastreams": [
    {
      "id": "location",
      "datapoints": [
        {
          "value": {
            "lon": 106,
            "lat": 29
          }
        }
      ]
    }
  ]
}
---------
{"datastreams":[{"id":"location","datapoints":[{"value":{"lon":106,"lat":29}}]}]}
============
81

3. 综合HTTP头和JSON输出需要的POST请求

#include <HttpPacket.h>
#include <ArduinoJson.h>

HttpPacketHead packet;

void setup() {
  // put your setup code here, to run once:

  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  //合成POST请求
  StaticJsonBuffer<200> jsonBuffer;

  JsonObject& lon_lat = jsonBuffer.createObject();
  lon_lat["lon"] = 106;
  lon_lat["lat"] = 29;

  JsonObject& value = jsonBuffer.createObject();
  value["value"] = lon_lat;

  JsonObject& id_datapoints = jsonBuffer.createObject();
  id_datapoints["id"] = "location";
  JsonArray& datapoints = id_datapoints.createNestedArray("datapoints");
  datapoints.add(value);

  JsonObject& myJson = jsonBuffer.createObject();
  JsonArray& datastreams = myJson.createNestedArray("datastreams");
  datastreams.add(id_datapoints);

  char p[200];
  int num = myJson.printTo(p,sizeof(p));

  packet.setHostAddress("api.heclouds.com");
  packet.setDevId("3225187");   //device_id
  packet.setAccessKey("R9xO5NZm6oVI4YBHvCPKEqtwYtMA");  //API_KEY
  // packet.setDataStreamId("<datastream_id>");    //datastream_id
  // packet.setTriggerId("<trigger_id>");
  // packet.setBinIdx("<bin_index>");

  /*create the http message about add datapoint */
  packet.createCmdPacket(POST, TYPE_DATAPOINT, p);
  if (strlen(packet.content))
    Serial.print(packet.content);
  Serial.print(p);

成功输出

POST /devices/3225187/datapoints HTTP/1.1
api-key: R9xO5NZm6oVI4YBHvCPKEqtwYtMA
Host: api.heclouds.com
Content-Length:81

{"datastreams":[{"id":"location","datapoints":[{"value":{"lon":106,"lat":29}}]}]}