Meaningful error messages?

Configuration
1

I’m attempting to set up my first device. It is a relay with mqtt control. From the examples and documentation I assembled a configuration and added to configuration.yaml:

mqtt:
  broker: 192.168.15.1
  port: 1883
  client_id: home-assistant

relay01:
  platform: mqtt
  name: Relay01
  command_topic: 'BdR14/Relay01/control'
  payload_on: 1
  payload_off: 0
  state_topic: 'BdR14/Relay01/state'

When starting up hass, I get this wondefully explicit error message:

The following components and platforms could not be set up:
 - relay01
Please check your config.

How to I figure out what is wrong ?

2

You’re missing the component type ‘switch’

mqtt:
  broker: 192.168.15.1
  port: 1883
  client_id: home-assistant
    
switch:
  - platform: mqtt
    name: "Relay01"
    command_topic: 'BdR14/Relay01/control'
    payload_on: 1
    payload_off: 0
    state_topic: 'BdR14/Relay01/state'

More info and examples at https://home-assistant.io/components/switch.mqtt/

3

How do I add a second or third switch ?

Repeat the full ‘switch:’ block with different parameters ‘name’ and ‘topic’ ?
Name seems to be optional, so it names things automatically if I add multiple items without naming them ?

4 
switch:
  - platform: mqtt
    name: "Relay01"
    command_topic: 'BdR14/Relay01/control'
    payload_on: 1
    payload_off: 0
    state_topic: 'BdR14/Relay01/state'

  - platform: mqtt
    name: "Relay02"
    command_topic: 'BdR14/Relay02/control'
    payload_on: 1
    payload_off: 0
    state_topic: 'BdR14/Relay02 /state'

  - [etc]
5

Good, thanks ! This seems to work.

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