Reading onboard data from Grant Aerona HP290 HomeAssistant

Hardware Heatpump
22

Are we talking water pressure? That’s in (at least) regParams, in tilesParams, tile 76 (0 indexed):

{
  "tilesParams": [
    ...
    [
      [
        [
          "2.2",
          6,
          0
        ]
      ],
      true,
      true,
      null,
      null,
      null,
      null
    ],
    ...
  ]
}

So that’s 2.2 bar

JQ for it..

curl -sfS -u admin:admin "http://YOUR_ECONET_IP/econet/regParams" | jq -r '.tilesParams[76][0][0][0]'
23

So it is! Thank you.

24

Nice work! Here’s the HA YAML

sensor:
  - platform: rest
    name: "Grant System Pressure"
    unique_id: '550e8400-e29b-41d4-a716-446655440000'
    resource: http://YOUR_ECONET_IP/econet/regParams
    username: "admin"
    password: "admin"
    authentication: basic
    scan_interval: 60
    value_template: "{{ value_json.tilesParams[76][0][0][0] }}"
    unit_of_measurement: "BAR"
25

I desoldered the flash chip and read it out with a xgecu T48. But turns out you can avoid the troubles and easily access the root shell via UART (no password protection :roll_eyes:) by soldering couple of wires to the test points (Testing to determine if you are a bot!).

26

No I haven’t discovered any other usable endpoints on the local api. But if you get shell access via uart it’s not difficult to add another endpoint for “allParams” which is currently only exposed to the cloud service :wink:
I’m currently porting the webserver to run on the emonpi with this additional endpoint, but haven’t yet rewritten all parts so can’t share this due to copyrights. Anyone interested in getting this setup, I’m happy to talk this through privately :slight_smile:

27

Hey, what’s the status of this? It would be great to get this functionallty locally in emonHub. If it’s working, are you able to open a PR? :folded_hands:

28

PR #227 just submitted. I’ve been running that version for several weeks so the code should be stable but I’ve just thrown the minimal docs together so they may contain a glaring error.

Please can you look at PR #224 for me too? I don’t think it should be controversial but maybe I’ve missed something.

@LeeNuss Your work to cut out the ecoNET bridge and connect direct to the wiring centre over uart sounds really interesting but I’ll wait for your public commit.

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