arduino的esp32程序无法上传_使用esp32-Arduino+PubSubClient+mqtt 上传数据到中移动OneNet...

使用esp32-doit-dev-v1开发板，测试mqtt协议, 发布(publish)到onenet 平台。

注意：

1.使用的mqtt arduino 客户端是 pubsubclient 库。其默认是ESP8266, 所以例子例包换文件“Wifi8266.h”，可以改为"Wifi.h"就可以。

2.关键是按照mqtt的onenet文档，编制payload数据包。其具体格式有多种类型。调试的是最简单的type3， json数据2 形式。

/*

Basic ESP8266 MQTT example

This sketch demonstrates the capabilities of the pubsub library in combination

with the ESP8266 board/library.

It connects to an MQTT server then:

- publishes "hello world" to the topic "outTopic" every two seconds

- subscribes to the topic "inTopic", printing out any messages

it receives. NB - it assumes the received payloads are strings not binary

- If the first character of the topic "inTopic" is an 1, switch ON the ESP Led,

else switch it off

It will reconnect to the server if the connection is lost using a blocking

reconnect function. See the 'mqtt_reconnect_nonblocking' example for how to

achieve the same result without blocking the main loop.

To install the ESP8266 board, (using Arduino 1.6.4+):

- Add the following 3rd party board manager under "File -> Preferences -> Additional Boards Manager URLs":

http://arduino.esp8266.com/stable/package_esp8266com_inde