Yeelink: W5500模块+mqtt 控制LED灯

mqtt_led.ino

#include <SPI.h>
#define WIZ550io_WITH_MACADDRESS 1
#include <Ethernet.h>
#include "EthernetClient.h"
#include "PubSubClient.h"
#define WIZ550io_WITH_MACADDRESS 1
#include <JsonParser.h>

using namespace ArduinoJson::Parser;

byte server[] = { 114,215,121,175 }; // ip for mqtt.yeelink.net

void mqtt_callback(char* topic, byte* payload, unsigned int length) {
	//Serial.print("topic=");
	//Serial.println(topic);
	//Serial.print("payload len=");
	//Serial.println(length);
	char* p = (char*)malloc(length + 1);
	memcpy(p,payload,length);
	p[length] = 0x0;
	JsonParser<16> parser;
	JsonObject root = parser.parse(p);

    if (!root.success())
    {
        Serial.println("JsonParser.parse() failed");
    } else {
    	char*  value    = root["value"];
    	Serial.print("value=");
    	Serial.println(value);
    	if (value[0] == '0') {
    		Serial.println("LED Power OFF");
    		digitalWrite(8, HIGH); // RGB LED, HIGH == OFF
    	} else {
    		Serial.println("LED Power ON");
    		digitalWrite(8, LOW); //  RGB LED, LOW == ON
    	}
    }
    free(p);
}

EthernetClient client;
///PubSubClient mqtt("mtqq.yeelink.net", 1883, mqtt_callback, client);
PubSubClient mqtt(server, 1883, mqtt_callback, client);

void setup()
{
	pinMode(8, OUTPUT);
	Serial.begin(9600);
	Ethernet.begin();
	Serial.print("ip=");
	Serial.println(Ethernet.localIP());
	Serial.print("mqtt connect=");
	Serial.println(mqtt.connect("arduinoClient", "your-username", "your-key"));
	int re = mqtt.subscribe("/v1.1/device/12825/sensor/21074/datapoints");
	Serial.print("subscribe=");
	Serial.println(re);
}

void loop()
{
	mqtt.loop();
}