Hey gang,
I’m a home assistant user. I’m looking to pull in the data via MQTT. While accessing the data isn’t a problem. I’m struggling with understanding the data. The docs mostly it is describing how to get it, maybe I’m impatient, but! I’m not seeing descriptions of the data that’s published. I can hazard guesses based on the topic names.
I’m specifically tracking heat pump data, but I guess it would be useful to see descriptions of the data for all the other energy monitoring types. I’m hoping someone out there can help since they’ve decoded it already themselves? Or they helped put this project together. 
Falling short of contributing to the project and putting in discovery MQTT topics for home assistant- I’m adding this lot to a YAML file in the interim to keep my life simpler - but maybe this will help others to update the project. Both the docs and adding HA Discovery topics to the MQTT publication.
Here’s a screenshot of the MQTT data:
But to simplify re-typing entity names, here’s the JSON output that I’m publishing to MQTT:
{
"electric_Power": 15.3,
"electric_Energy": 409.459,
"heatmeter_Energy": 1630,
"heatmeter_Energy2": 0,
"heatmeter_Volume": 979.822,
"heatmeter_Volume2": 0,
"heatmeter_Record5": 10700,
"heatmeter_Record6": 1100,
"heatmeter_Record7": 0.49845829606056213,
"heatmeter_Record8": 0.12362194061279297,
"heatmeter_FabNo": 29907100,
"heatmeter_DateTime": 636619779,
"heatmeter_Record11": -3615,
"heatmeter_FlowT": 19.72314453125,
"heatmeter_ReturnT": 19.697265625,
"heatmeter_FlowRate": 0.5067667961120605,
"heatmeter_Power": 0,
"heatmeter_Record16": 0,
"heatmeter_Ontime Hours": 3172,
"heatmeter_Record18": 0,
"heatmeter_heat_calc": 15.118185330518624,
"time": 1684407840.08018
}
So I’m putting this lot into YAML config for Home Assistant. I’m hoping I can come back here and edit this based on kind folks helping me decode the data!
mqtt:
## Open Energy Monitor (Heatpump)
sensor:
- name: "Heatpump - Electric Power"
unique_id: UUID_heatpump_electric_power
state_topic: "emon/UUID/electric_Power"
# state_class: total_increasing
# value_template: >-
# {{states.sensor.givtcp_battery_soc.state}}
unit_of_measurement: 'W'
device_class: power
icon: |
mdi:power
- name: "Heatpump - Electric Energy"
unique_id: UUID_heatpump_electric_energy
state_topic: "emon/UUID/electric_Energy"
# state_class: total_increasing
# value_template: >-
# {{states.sensor.givtcp_battery_soc.state}}
unit_of_measurement: 'Wh'
device_class: energy
icon: |
mdi:battery
- name: "Heatpump - Heating flow temperature"
unique_id: UUID_heatpump_tempgenerated
state_topic: "emon/UUID/heatmeter_FlowT"
# state_class: total_increasing
# value_template: >-
# {{states.sensor.givtcp_battery_soc.state}}
unit_of_measurement: '°C'
device_class: temperature
icon: |
mdi:thermometer
- name: "Heatpump - Heating return temperature"
unique_id: UUID_heatpump_tempreturn
state_topic: "emon/UUID/heatmeter_ReturnT"
# state_class: total_increasing
# value_template: >-
# {{states.sensor.givtcp_battery_soc.state}}
unit_of_measurement: '°C'
device_class: temperature
icon: |
mdi:thermometer
- name: "Heatpump - Heating flow rate"
unique_id: UUID_heatpump_flow_rate
state_topic: "emon/UUID/heatmeter_FlowRate"
# state_class: total_increasing
# value_template: >-
# {{states.sensor.givtcp_battery_soc.state}}
unit_of_measurement: 'm3/s'
device_class: speed
icon: |
mdi:dashboard
- name: "Heatpump - Date time"
unique_id: UUID_heatpump_time
state_topic: "emon/json/UUID"
# state_class: total_increasing
value_template: >-
{{value_json.time | timestamp_local }}
# unit_of_measurement: 'm3/s'
device_class: timestamp
icon: |
mdi:clock
So some questions I’m looking to get help answering:
- For the the data items I’ve done so far, have I got the descriptions and attributes correct?
- Can you help enhance what’s there, if it is right?
- For data items that are labelled ‘energy’ - when does this value reset? … or is that based on commissioning date? Or does it vary per data item?
For every other item I’ve not added:
- What does it represent?
- What is the units of measurement?
- Is the value a: Measurement, Total or Total increasing over time?
- If the value is a total increasing over time, when/where do I find out when it was last reset?
- What’s the device class?
That should give us a good start!
Looking forward to collaborating on getting this data in.
Thanks 
