Estoy trabajando en un proyecto de domótica. El objetivo básico de mi proyecto es controlar los relés y otros sensores ubicados en diferentes ubicaciones. He configurado mi Raspberry Pi como corredor de MQTT. Mosquitto está funcionando bien. Por ahora, lo que intento hacer es activar un relé conectado con esp8266 (GPIO2). Aquí está mi código de servidor web Python:
import paho.mqtt.client as mqtt
from flask import Flask, render_template, request
app = Flask(__name__)
mqttc=mqtt.Client()
mqttc.connect("localhost",1883,60)
mqttc.loop_start()
# Create a dictionary called pins to store the pin number, name, and pin state:
pins = {
2 : {'name' : 'GPIO 2', 'board' : 'esp8266', 'topic' : 'esp8266/2', 'state' : 'False'}
}
# Put the pin dictionary into the template data dictionary:
templateData = {
'pins' : pins
}
@app.route("/")
def main():
# Pass the template data into the template main.html and return it to the user
return render_template('main.html', **templateData)
# The function below is executed when someone requests a URL with the pin number and action in it:
@app.route("/<board>/<changePin>/<action>")
def action(board, changePin, action):
# Convert the pin from the URL into an integer:
changePin = int(changePin)
# Get the device name for the pin being changed:
devicePin = pins[changePin]['name']
# If the action part of the URL is "on," execute the code indented below:
if action == "1" and board == 'esp8266':
mqttc.publish(pins[changePin]['topic'],"1")
pins[changePin]['state'] = 'True'
if action == "0" and board == 'esp8266':
mqttc.publish(pins[changePin]['topic'],"0")
pins[changePin]['state'] = 'False'
# Along with the pin dictionary, put the message into the template data dictionary:
templateData = {
'pins' : pins
}
return render_template('main.html', **templateData)
if __name__ == "__main__":
app.run(host='0.0.0.0', port=8181, debug=True)
Aquí está mi código HTML:
<!DOCTYPE html>
<head>
<title>RPi Web Server</title>
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css" integrity="sha384-fLW2N01lMqjakBkx3l/M9EahuwpSfeNvV63J5ezn3uZzapT0u7EYsXMjQV+0En5r" crossorigin="anonymous">
<!-- Latest compiled and minified JavaScript -->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS" crossorigin="anonymous"></script>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<h1>RPi Web Server - ESP8266 MQTT</h1>
{% for pin in pins %}
<h2>{{ pins[pin].name }}
{% if pins[pin].state == 'True' %}
is currently <strong>on</strong></h2><div class="row"><div class="col-md-2">
<a href="/esp8266/{{pin}}/0" class="btn btn-block btn-lg btn-default" role="button">Turn off</a></div></div>
{% else %}
is currently <strong>off</strong></h2><div class="row"><div class="col-md-2">
<a href="/esp8266/{{pin}}/1" class="btn btn-block btn-lg btn-primary" role="button">Turn on</a></div></div>
{% endif %}
{% endfor %}
</body>
</html>
Aquí está mi código ESP8266:
#include <ESP8266WiFi.h>
#include <PubSubClient.h
const char* ssid = "Godfather";
const char* password = "idontknow";
const char* mqtt_server = "192.168.137.100";
WiFiClient espClient;
PubSubClient client(espClient);
const int ledGPIO2 = 2;
void setup_wifi() {
delay(10);
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("WiFi connected - ESP IP address: ");
Serial.println(WiFi.localIP());
}
void callback(String topic, byte* message, unsigned int length) {
Serial.print("Message arrived on topic: ");
Serial.print(topic);
Serial.print(". Message: ");
String messageTemp;
for (int i = 0; i < length; i++) {
Serial.print((char)message[i]);
messageTemp += (char)message[i];
}
Serial.println();
if(topic=="esp8266/2"){
Serial.print("Changing GPIO 2 to ");
if(messageTemp == "1"){
digitalWrite(ledGPIO2, HIGH);
Serial.print("On");
}
else if(messageTemp == "0"){
digitalWrite(ledGPIO4, LOW);
Serial.print("Off");
}
}
Serial.println();
}
void reconnect() {
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
if (client.connect("ESP8266Client")) {
Serial.println("connected");
client.subscribe("esp8266/2");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
// Wait 5 seconds before retrying
delay(5000);
}
}
}
void setup() {
pinMode(ledGPIO2, OUTPUT);
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
}
void loop() {
if (!client.connected()) {
reconnect();
}
if(!client.loop())
client.connect("ESP8266Client");
}
Resultados: todo parece estar funcionando bien, pero aún así el relé no se activa cuando presiono el botón en el servidor web. Creo que el ESP no está suscrito correctamente. Cuando ejecuto el script de Python en el terminal, para el primer clic recibo HTTP / 1.1 "404 en el terminal, y en cada otro clic recibo HTTP / 1.1" 200
My Pi está trabajando en IP dinámica en este momento. Pero me he asegurado de que el ESP8266 esté configurado con la dirección IP Pi actual.