How to controll gpio with mqtt

ESPHome
1

Hi All,
I have a working yaml config using api. Recently, I tried with MQTT (remove api) but I have no idea on how to do that. My searches in the forum only show result with mqtt platform, no where to hint how to use gpio with mqtt.
I tested with MQTT explorer and issue a command for the following switch (see image)

image

and the light turn on as expected. My code as following

=========================

....
mqtt:
  broker: ".......sfdp.net"
  username: "mqtt_user"
  password: "mqtt_user"
  discovery: true
  port: 1883  
wifi:
  networks:
  - ssid: "HOME"
    password: "ngoc12345"
   # Optional manual IP
  manual_ip:
    static_ip: 192.168.100.133
    gateway: 192.168.100.254
    subnet: 255.255.255.0
    dns1: 8.8.8.8
    dns2: 8.8.4.4
i2c:
  - id: bus_a
    sda: 0
    scl: 2
    scan: true

pcf8574:
  - id: 'pcf8574_hub'
    i2c_id: bus_a
    address: 0x38
    pcf8575: false

binary_sensor:
  - platform: gpio
    name: "Input_1"
    pin:
      pcf8574: pcf8574_hub
      number: 0
      mode: INPUT
      inverted: False
    on_press:
      then:
        - switch.toggle: id1
switch:
  - platform: gpio
    name: "Lamp 1"
    id: id1
    restore_mode: DISABLED
    pin:
      pcf8574: pcf8574_hub
      # Use pin number P0
      number: 4
      # One of INPUT or OUTPUT
      mode: 
        output: true
      inverted: False

=========================

Please be so kind to guide me on this with thanks.
Best
Ngoc

2

Does the fact that you want to do with this MQTT mean you’re not using HA in the setup? If HA is involved it would make more sense to just have an automation on HA turn the switch on.

3

Esphome will create mqtt entities automatically in HA, and they will work just like any other entity. MQTT Client Component — ESPHome

4

Thanks All for your reply, I have just figured out MQTT will create new entity and i have to remove all old entity and add newly added entities back to dashboard.
Appreciate your supports!
Ngoc