使用 mongoose (javascript) + ESP32 从 MQTT flespi 切换 ON/OFF 中继

Question

我有一个项目可以打开和关闭连接到 ESP32 的继电器板（使用 Mongoose OS Javascript 编程）。现在，使用 flespi MQTT，我想通过订阅主题来打开和关闭中继。我已经完成设置和配置 flespi MQTT 代理，它可以通过在 flespi MQTT 上键入任何消息来打开和关闭中继板。

由于我是 MQTT 的新手，我如何才能在收到（订阅）来自 flespi MQTT 的消息时仅发送能够打开和关闭中继的特定消息。例如， 'ON Relay' = 将打开继电器，'OFF Relay' = 将关闭继电器。只有这条消息会触发看板。

这是我的代码：

load('api_config.js');
load('api_gpio.js');
load('api_mqtt.js');
load('api_net.js');
load('api_sys.js');
load('api_timer.js');
load('api_adc.js');

let currentState = 0,
  relaypin = 4;

GPIO.set_mode(relaypin, GPIO.MODE_OUTPUT);

MQTT.sub('topic/#', function(conn, topic, msg) {
  print('Topic', topic, 'message', msg);
  print('ok');
  currentState = 1 - currentState;
  GPIO.write(relaypin, currentState);
  print('Relay is = ' + (currentState ? 'OFF' : 'ON'));

}, null);

Answer 1

我已经解决了这个问题:

/*This command will trigger relay 
ON
{
"actuator" : "relay1",
"state": 1
}
OFF
{
"actuator" : "relay1",
"state": 0
}
*/

load('api_config.js');
load('api_gpio.js');
load('api_mqtt.js');
load('api_net.js');
load('api_sys.js');
load('api_timer.js');
load('api_adc.js');

let relaypin = 4;

GPIO.set_mode(relaypin, GPIO.MODE_OUTPUT);
GPIO.write(relaypin, 1);

MQTT.sub('my/rainsensor', function(conn, topic, payload)
{
    let test = JSON.parse(payload);
    print('Topic:', topic, 'actuator type:', test.actuator, 'state:', test.state);

    //Check if '1' received and trigger relay ON
    if (1 === test.state) 
    {
    GPIO.write(relaypin, 0);
    print('Relay is = ON');
    }

    else if (0 === test.state) 
    {
    GPIO.write(relaypin, 1);
    print('Relay is = OFF');
    }

    else
    {
      print('WRONG COMMAND!!!');
    }
}, null);

使用 mongoose (javascript) + ESP32 从 MQTT flespi 切换 ON/OFF 中继

Switch ON/OFF Relay from MQTT flespi using mongoose (javascript) + ESP32

javascript

relay

mongoose

mqtt