change-address.yaml

esphome:
  name: power-meter
  on_boot:
    ## configure controller settings at setup
    ## make sure priority is lower than setup_priority of modbus_controller
    priority: -100
    then:
      - lambda: |-
          auto new_address = 0x05;

          if(new_address < 0x01 || new_address > 0xF7) // sanity check
          {
            ESP_LOGE("ModbusLambda", "Address needs to be between 0x01 and 0xF7");
            return;
          }

          esphome::modbus_controller::ModbusController *controller = id(pzem);
          auto set_addr_cmd = esphome::modbus_controller::ModbusCommandItem::create_write_single_command(
            controller, 0x0002, new_address);

          delay(200) ;
          controller->queue_command(set_addr_cmd);
          ESP_LOGI("ModbusLambda", "PZEM Addr set");

esp8266:
  board: nodemcuv2

# Enable logging
logger:


# Enable Home Assistant API
api:
  encryption:
    key: !secret encryption_key

ota:
  password: !secret ota_password

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Power-Meter Fallback Hotspot"
    password: !secret fallback_hotspot_password


captive_portal:
    

uart:
  rx_pin: D2
  tx_pin: D1
  baud_rate: 9600

sensor:
  - platform: pzemac
    current:
      name: "PZEM-004T V3 Current"
    voltage:
      name: "PZEM-004T V3 Voltage"
    energy:
      name: "PZEM-004T V3 Energy"
    power:
      name: "PZEM-004T V3 Power"
    frequency:
      name: "PZEM-004T V3 Frequency"
    power_factor:
      name: "PZEM-004T V3 Power Factor"
    update_interval: 5s

modbus:
  send_wait_time: 200ms
  id: mod_bus_pzem

modbus_controller:
  - id: pzem
    # The current device address.
    address: 0xF8
    # The special address 0xF8 is a broadcast address accepted by any pzem device,
    # so if you use this address, make sure there is only one pzem device connected
    # to the uart bus.
    # address: 0xF8
    modbus_id: mod_bus_pzem
    command_throttle: 0ms
    setup_priority: -10
    update_interval: 5s