Added example home-assistant config file.

doc/home-assistant-sensor-config-example.yaml

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+sensor:
+  - platform: "mqtt"
+    state_topic: "smartmeter/current_l1"
+    unit_of_measurement: "A"
+    value_template: "{{ value.split(' ') | first | float }}"
+    device_class: "current"
+    name: "Smartmeter: Current Delivered"
+  - platform: "mqtt"
+    state_topic: "smartmeter/electricity_failures"
+    value_template: "{{ value.split(' ') | first | int }}"
+    name: "Smartmeter: Number of Electricity Failures"
+  - platform: "mqtt"
+    state_topic: "smartmeter/electricity_long_failures"
+    value_template: "{{ value.split(' ') | first | int }}"
+    name: "Smartmeter: Number of Long Electricity Failures"
+  - platform: "mqtt"
+    state_topic: "smartmeter/electricity_tariff"
+    value_template: "{{ value.split(' ') | first | int }}"
+    name: "Smartmeter: Energy Tariff"
+  - platform: "mqtt"
+    state_topic: "smartmeter/energy_delivered_tariff1"
+    unit_of_measurement: "kWh"
+    value_template: "{{ value.split(' ') | first | float }}"
+    device_class: "energy"
+    name: "Smartmeter: Energy Delivered tariff 1"
+  - platform: "mqtt"
+    state_topic: "smartmeter/energy_delivered_tariff2"
+    unit_of_measurement: "kWh"
+    value_template: "{{ value.split(' ') | first | float }}"
+    device_class: "energy"
+    name: "Smartmeter: Energy Delivered tariff 2"
+  - platform: "mqtt"
+    state_topic: "smartmeter/gas_delivered"
+    unit_of_measurement: "m3"
+    value_template: "{{ value.split(' ') | first | float }}"
+    name: "Smartmeter: Gas Delivered"
+  - platform: "mqtt"
+    state_topic: "smartmeter/timestamp"
+    device_class: "timestamp"
+    value_template: '{{ strptime(value | regex_replace("[^0-9]*", ""), "%y%m%d%H%M%S") }}'
+    name: "Smartmeter: Last Measurement"
+  - platform: "mqtt"
+    state_topic: "smartmeter/power_delivered"
+    unit_of_measurement: "kW"
+    value_template: "{{ value.split(' ') | first | float }}"
+    device_class: "power"
+    name: "Smartmeter: Power Delivered"