放棄思考

MEMO

linklt7697 and Mosquitto broker MUST in a same network.
You can reserve a fix IP for Mosquitto broker in DHCP Service.
Just for fun.

For more information, such as circuit diagram, material list, please visit following blog: https://javatoybox.blogspot.com/2019/08/iot-wifi-3.html

	# Reference:
	# https://blog.gtwang.org/iot/raspberry-pi/raspberry-pi-mosquitto-mqtt-broker-iot-integration/

	# update APT Server list
	apt-get update

	# install mosquitto broker and test client
	apt-get install mosquitto mosquitto-clients

	# check service is running or not
	service mosquitto status

	# exit check
	:q

	# build a "subscriber" for test
	mosquitto_sub -t javatoybox/message

	# test broker with "publisher"
	mosquitto_pub -t javatoybox/message -m "Hello, world!"

	/*
	reference:

	https://docs.labs.mediatek.com/resource/linkit7697-arduino/zh_tw/developer-guide/using-the-wi-fi-library
	https://blog.gtwang.org/iot/raspberry-pi/raspberry-pi-mosquitto-mqtt-broker-iot-integration/
	https://randomnerdtutorials.com/why-you-shouldnt-always-use-the-arduino-delay-function/
	https://swf.com.tw/?p=1021
	https://github.com/ArcherHuang/LinkIt_7697/blob/master/Arduino/MQTT_MCS_Control_LED/MQTT_MCS_Control_LED.ino

	For more information, such as circuit diagram, material list, please visit following blog:
	https://javatoybox.blogspot.com/2019/08/iot-wifi-3.html
	*/

	#include <LWiFi.h>
	#include <PubSubClient.h>

	#define WIFI_SSID "YOUR_SSID" // your network SSID (name)
	#define WIFI_PASSWORD "WPA/WPA2_PASSWORD" // your network password

	#define MQTT_SERVER_IP "<SERVER_IP>"
	#define MQTT_SERVER_PORT 1883
	#define MQTT_CLIENT_ID "linklt7697_12345678"
	#define MQTT_SUB_TOPIC "javatoybox/linkit7697/AC-Light-switch"

	int controlPin = 3; //set control pin for on/off relay

	int status = WL_IDLE_STATUS; // the Wifi radio's status
	WiFiClient mqttClient;
	PubSubClient client(mqttClient);

	void callback(char* topic, byte* payload, unsigned int length);

	void setup() {
	//Initialize serial and wait for port to open:
	Serial.begin(9600);

	// set Pin mode
	pinMode(controlPin, OUTPUT);

	client.setServer(MQTT_SERVER_IP, MQTT_SERVER_PORT);
	client.setCallback(callback);
	connectWifi();
	connectMQTT();
	}

	void loop() {
	// check the network connection once every 1 seconds:
	// delay(1000);

	// check if disconnect WIFI, then reconnect
	connectWifi();
	connectMQTT();
	client.loop();
	}

	void connectWifi() {
	// attempt to connect to Wifi network:
	while (status != WL_CONNECTED) {
	delay(5000);
	Serial.print("Attempting to connect to WPA SSID: ");
	Serial.println(WIFI_SSID);
	// Connect to WPA/WPA2 network:
	status = WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
	// you're connected now, so print out the data:
	if (status = WL_CONNECTED){
	Serial.println("You're connected to Wifi network");
	printWifiData();
	}
	}
	}

	void printWifiData() {
	// print your WiFi shield's IP address:
	IPAddress ip = WiFi.localIP();
	Serial.print("IP Address: ");
	Serial.println(ip);

	// print your MAC address:
	byte mac[6];
	char mac_str[18];
	WiFi.macAddress(mac);
	Serial.print("MAC address: ");
	sprintf(mac_str, "%02x:%02x:%02x:%02x:%02x:%02x", mac[5], mac[4], mac[3], mac[2], mac[1], mac[0]);
	Serial.println(mac_str);
	Serial.println("====================");
	}

	void connectMQTT() {
	// Loop until we're reconnected
	while (!client.connected())
	{
	Serial.print("Attempting MQTT connection...");
	// Attempt to connect
	if (client.connect(MQTT_CLIENT_ID))
	{
	Serial.println("connected");
	client.subscribe(MQTT_SUB_TOPIC);
	}
	else
	{
	Serial.print("failed, rc=");
	Serial.print(client.state());
	Serial.println(" try again in 5 seconds");
	// Wait 5 seconds before retrying
	delay(5000);
	}
	}
	}
	// Callback function
	void callback(char* topic, byte* payload, unsigned int length) { //MQTT Relay
	Serial.print("Input Message arrived [");
	Serial.print(MQTT_SUB_TOPIC);
	Serial.print("] ");
	Serial.print((char)payload[0]);
	if((char)payload[0] == '1'){
	digitalWrite(controlPin, HIGH);
	}else if((char)payload[0] == '0'){
	digitalWrite(controlPin, LOW);
	}else{
	Serial.print("value error");
	}
	Serial.println();
	}

放棄思考

2019年8月13日星期二

IoT 第一步！Wifi 開關電燈，動手做，設定及編寫程式 ( 三 )

注意事項︰

購置零件 ( Material list )︰

注意事項 ( 裝修及改裝時必須了解 )︰

程式碼及提示:

安裝及設定 Arduino IDE︰

安裝 PubSubClient 程式庫︰

在 Raspberry pi 安裝 Mosquitto ︰

MQTT connection settings

Apps store 安裝 "MQTT Dash"︰

組裝電路 ( 附 Fritzing 圖解 )

注意事項︰

HLK-5M05 Buck Step Down Power Supply Module︰

LinkIt 7697 and One 1 Channel 5V Relay Module︰

測試︰

總結︰