esphome:
  name: uart-mock-modbus-dep-buffer

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;

globals:
  - id: reg10
    type: uint16_t
    initial_value: "0"

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: 0x10
        value_type: U_WORD
        read_lambda: return id(reg10);
        write_lambda: |-
          id(reg10) = x;
          return true;

# A number whose write_lambda uses the DEPRECATED buffer parameter (fills `payload` with a legacy raw
# frame as words: device address + function code + data) instead of the new item->write_* API. The write
# must still land with its legacy semantics, and the one-time deprecation warning must fire only once per
# entity no matter how many writes happen.
number:
  - platform: modbus_controller
    modbus_controller_id: modbus_controller_1
    name: "buf_number"
    id: buf_number
    address: 0x10
    register_type: holding
    value_type: U_WORD
    min_value: 0
    max_value: 1000
    step: 1
    write_lambda: |-
      // Legacy raw frame as words: [addr 0x01 | fc 0x06], register 0x0010, value.
      payload.push_back(0x0106);
      payload.push_back(0x0010);
      payload.push_back((uint16_t) x);
      return {};

# Reports the server-side register so the test can observe that the deprecated buffer write landed.
sensor:
  - platform: template
    name: "written_value"
    id: written_value
    update_interval: 0.5s
    lambda: "return id(reg10);"

button:
  - platform: template
    name: "Start Scenario"
    id: start_scenario_btn
    # The test drives the writes via number_command; the mock is autostart.