esphome/tests/integration/fixtures/uart_mock_modbus_broadcast_write.yaml

esphome:
  name: uart-mock-modbus-broadcast

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  # controller polls at boot; forwarding must already be active
    debug:
    on_tx:
      - then:
          - uart_mock.inject_rx:
              id: virtual_uart_controller
              data: !lambda return data;
          - uart_mock.inject_rx:
              id: virtual_uart_server_2
              data: !lambda return data;
  - id: virtual_uart_server_2
    baud_rate: 9600
    auto_start: true
    debug:
    on_tx:
      - then:
          - uart_mock.inject_rx:
              id: virtual_uart_server
              data: !lambda return data;
          - 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;
          - uart_mock.inject_rx:
              id: virtual_uart_server_2
              data: !lambda return data;

modbus:
  - uart_id: virtual_uart_server
    id: virtual_modbus_server
    role: server
  - uart_id: virtual_uart_server_2
    id: virtual_modbus_server_2
    role: server
  - uart_id: virtual_uart_controller
    id: virtual_modbus_client
    role: client
    turnaround_time: 10ms

globals:
  - id: srv1_reg
    type: int
    initial_value: "0"
  - id: srv2_reg
    type: int
    initial_value: "0"

modbus_controller:
  - address: 1
    modbus_id: virtual_modbus_client
    # Polling is off until the test has subscribed; the Start Scenario button starts it, so the
    # first poll is never lost to a boot-time race ahead of the API subscription.
    update_interval: never
    id: modbus_controller_1

modbus_server:
  - address: 1
    modbus_id: virtual_modbus_server
    registers:
      - address: 0x01
        value_type: U_WORD
        read_lambda: return 919;
      - address: 0x10
        value_type: U_WORD
        read_lambda: return id(srv1_reg);
        write_lambda: |-
          id(srv1_reg) = x;
          return true;
  - address: 2
    modbus_id: virtual_modbus_server_2
    registers:
      - address: 0x10
        value_type: U_WORD
        read_lambda: return id(srv2_reg);
        write_lambda: |-
          id(srv2_reg) = x;
          return true;

sensor:
  # Normal polling continues before and after the broadcast: the old behavior burned a
  # timeout per broadcast, which surfaces as modbus warnings and failed expectations here.
  - platform: modbus_controller
    modbus_controller_id: modbus_controller_1
    name: "reg_u_word"
    address: 0x01
    register_type: holding
    value_type: U_WORD
    # Republish every poll (the value is constant 919): the test observes successive publishes to
    # prove polling continues before and after the broadcast, which dedup would otherwise hide.
    force_update: true
  # The servers' written values, published locally.
  - platform: template
    name: "srv1_written"
    lambda: return id(srv1_reg);
    update_interval: 0.2s
  - platform: template
    name: "srv2_written"
    lambda: return id(srv2_reg);
    update_interval: 0.2s
  # Whether the hub accepted the broadcast into the transmit queue (the bool queue_pdu() returns).
  - platform: template
    name: "broadcast_accepted"
    id: broadcast_accepted

button:
  - platform: template
    name: "Start Scenario"
    id: start_scenario_btn
    on_press:
      - lambda: |-
          // Start polling now that the test has subscribed.
          id(modbus_controller_1).set_update_interval(1000);
          id(modbus_controller_1).start_poller();
          // Broadcast (address 0) write single register: reg 0x10 = 777 on every server.
          // PDU is function code + data (no address/CRC); the hub prepends address 0 and appends CRC.
          const uint8_t pdu[] = {0x06, 0x00, 0x10, 0x03, 0x09};
          // queue_pdu() returns whether the broadcast was accepted into the machine (the answer this PR
          // makes meaningful); publish it so the test asserts the accept, not just the servers' writes.
          bool accepted = id(virtual_modbus_client)->queue_pdu(0x00, pdu);
          id(broadcast_accepted).publish_state(accepted ? 1.0f : 0.0f);