esphome:
  name: uart-mock-modbus-custom-command

host:
api:
logger:
  level: VERBOSE

external_components:
  - source:
      type: local
      path: EXTERNAL_COMPONENT_PATH

# Dummy uart entry to satisfy modbus's DEPENDENCIES = ["uart"]
# The actual UART bus used is the uart_mock component below
uart:
  baud_rate: 115200
  port: /dev/null

uart_mock:
  - id: virtual_uart_server
    baud_rate: 9600
    auto_start: true
    debug:
    on_tx:
      - then:
          - uart_mock.inject_rx:
              id: virtual_uart_controller
              data: !lambda return data;
  - id: virtual_uart_controller
    baud_rate: 9600
    auto_start: true
    debug:
    on_tx:
      - then:
          - uart_mock.inject_rx:
              id: virtual_uart_server
              data: !lambda return data;

modbus:
  - uart_id: virtual_uart_server
    id: virtual_modbus_server
    role: server
  - uart_id: virtual_uart_controller
    id: virtual_modbus_controller
    role: client
    turnaround_time: 10ms

modbus_controller:
  - address: 1
    modbus_id: virtual_modbus_controller
    id: modbus_controller_1
    update_interval: 1s

modbus_server:
  - address: 1
    modbus_id: virtual_modbus_server
    id: modbus_server_1
    registers:
      - address: 0x01
        value_type: U_WORD
        read_lambda: return 259;

sensor:
  # Plain read to confirm the controller <-> server link is up.
  - platform: modbus_controller
    modbus_controller_id: modbus_controller_1
    name: "plain_read"
    address: 0x01
    register_type: holding
    value_type: U_WORD
  # Custom command: a raw frame {device address, function code, address hi, address lo,
  # count hi, count lo}; the CRC is appended by the hub. Reads holding register 0x0001,
  # count 1; the lambda parses the response payload (the register value, big-endian).
  - platform: modbus_controller
    modbus_controller_id: modbus_controller_1
    name: "custom_read"
    custom_command: [0x01, 0x03, 0x00, 0x01, 0x00, 0x01]
    lambda: |-
      if (data.size() < 2) return {};
      return (float) ((data[0] << 8) | data[1]);

button:
  - platform: template
    name: "Start Scenario"
    id: start_scenario_btn
    # This test does not have anything to start (mock is autostart)