Read Logarex smart meter via ESPHome and SML

ESPHome
1

Hi guys,

I am trying to read a logarex smart meter via ESP8266 (ESP01) and ESPHome to integrate all in HA.
The smart meter in unlocked via pin for extended information.

Unfortunately I do not get any readings in ESPHome.
Could someone check my config?

esphome:
  name: stromzahler
  friendly_name: Stromzähler

esp8266:
  board: esp01_1m

# Enable logging
logger:
  baud_rate: 0

# Enable Home Assistant API
api:
  encryption:
    key: ""

ota:
  - platform: esphome
    password: ""

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Stromzahler Fallback Hotspot"
    password: ""


uart:
  id: uart_bus
  tx_pin: 1
  rx_pin: 3
  baud_rate: 9600
  data_bits: 8
  parity: NONE
  stop_bits: 1

sml:
  id: mysml
  uart_id: uart_bus
  on_data:
#    then:
    - logger.log: "telegram received"

sensor:
  - platform: sml
    name: "Energie Bezug"
    sml_id: mysml
    obis_code: "1-0:1.8.0"
    unit_of_measurement: kWh
    accuracy_decimals: 3
    device_class: energy
    state_class: total_increasing
#    filters:
#      - multiply: 0.0001
#      - throttle_average: 300s
  - platform: sml
    name: "Energie Einspeisung"
    sml_id: mysml
    obis_code: "1-0:2.8.0"
    unit_of_measurement: kWh
    accuracy_decimals: 3
    device_class: energy
    state_class: total_increasing
#    filters:
#      - multiply: 0.0001
#      - throttle_average: 300s
#  - platform: sml
#    name: "Aktuelle Leistung"
#    sml_id: mysml
#    obis_code: "1-0:16.7.0"
#    unit_of_measurement: W
#    accuracy_decimals: 0
#    device_class: power
#    state_class: measurement

Should the obis code contain “255”?

obis_code: "1-0:1.8.0*255"

It is stated in the datasheet, but the examples uses “1-0:1.8.0”.

I don’t get any loggings from the uart. Is this the normal behavior? I would expect at least some info, even it is interpreted wrong.

Thanks and regards

2

I checked all connections to the ESP01 to exclude all hardware errors.

I also checked the data stream at the rx pin. Looks good too:

logarex_log
logarex_log927×63 5.98 KB

All values are sent by the smart meter.
Why is no data transfered from uart to sml component?
Why can I not see any data in the ESPHome log?

Thanks and regards.