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}}]}]}