# Several wiredsensor nodes on one RS485 segment, read by a single ESP32.
#
# The point of a bus: one gateway, one pair of wires, N sensors. Each node needs
# a distinct UNIT_ADDRESS, which means one firmware image per node — see the
# Configuration section of the top-level README.
#
#     esphome run bus-of-nodes.yaml
#
# The per-node entities live in wiredsensor-node.yaml and are instantiated once
# per address below, so adding a node is three lines rather than a copied block.

substitutions:
  name: rs485-gateway
  friendly_name: "RS485 gateway"
  baud_rate: "19200"
  tx_pin: GPIO17
  rx_pin: GPIO16
  de_pin: GPIO4

esphome:
  name: ${name}
  friendly_name: ${friendly_name}

esp32:
  board: esp32dev
  framework:
    type: esp-idf

logger:
  level: INFO

api:
  encryption:
    key: !secret api_encryption_key

ota:
  - platform: esphome
    password: !secret ota_password

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password
  ap: {}

captive_portal:

# ---------------------------------------------------------------- the bus ---

uart:
  id: rs485
  tx_pin: ${tx_pin}
  rx_pin: ${rx_pin}
  baud_rate: ${baud_rate}
  data_bits: 8
  parity: NONE
  stop_bits: 1

modbus:
  id: rs485_bus
  uart_id: rs485
  flow_control_pin: ${de_pin}

# ----------------------------------------------------------------- nodes ---
#
# One entry per node. `node_id` must be unique; `node_addr` must match that
# node's UNIT_ADDRESS.
#
# Requests are serialised across the whole bus — ESPHome waits for each response
# before sending the next — so poll cost scales with node count. A node answers
# roughly 2 ms after the request ends, so a dozen nodes at 30 s is nowhere near
# saturating the segment. If you do see timeouts, `command_throttle` on the
# controllers is the knob, not `update_interval`.

packages:
  hallway: !include
    file: wiredsensor-node.yaml
    vars:
      node_id: node_hallway
      node_addr: "0x01"
      node_name: "Hallway"

  cellar: !include
    file: wiredsensor-node.yaml
    vars:
      node_id: node_cellar
      node_addr: "0x02"
      node_name: "Cellar"

  greenhouse: !include
    file: wiredsensor-node.yaml
    vars:
      node_id: node_greenhouse
      node_addr: "0x03"
      node_name: "Greenhouse"