HA integration needed please! :)

[dariusz737]

Finally I have finish two units, for two cars. But desperately need to make Home Assistant integration. I need minimum status, charging on, off, charging power settings. Description in wiki are black magic for me. I have integrated few devices so far, but I have no point to start here. Please someone help me?

[dzurikmiroslav]

I haven't had time to learn how to work with HA yet :)
Do you need to integrate with the MQTT broker?

[dariusz737]

Yes. What adres should I put, to send or receive?

[dariusz737]

I was reading, all I found reflects to Shelby etc... :) I am receiving packets (look at screenshot) , and I will learn how to proces them and change fot "entities". Bu what to put in "topic" and "payload" in the upper part of screenshot to change current to 10A.

[dariusz737]

I have broker, I can receive message via topic "ladowarka-lewa" as I have named it. How to send it, via what topic, what to put in payload.

[dariusz737]

I trying to deal with this, no success. for sure wrong syntax. How to receive message, an set current for example via MQTT :)

[dzurikmiroslav]

Yes, I forgot to make MQTT subscribe script example in the wiki :)

Here is sample which I recently test:

local mqtt = require("mqtt")

local client = mqtt.client("mqtt://broker.hivemq.com:1883")

client:setonmessage(function(topic, data)
  if topic == "ladowarka-lewa/setcurrent" then
    evse.setchargingcurrent(tonumber(data))
  end
end)

client:setonconnect(function()
  print("MQTT contected")
  client:subscribe("ladowarka-lewa/setcurrent")
end)

client:connect()

And publish this message:

[dariusz737]

Thank you very much. Finally works a little :) Small problem with f... dictionary, wich changed "l" to "ł" and I didn't notice...
But for every command I have to set "setonmessage"? How to make it working as on first example with json ...

I don't know from where I have got this... it was two weeks ago :)

client:setonmessage(function(topic, message)
print("Received message from topic: " .. topic)
local data = json.decode(message)
-- Process received data here
if data.method == "setCurrent" then
evse.setchargingcurrent(data.params.current)
end
-- Add more processing logic as needed
end)

[dzurikmiroslav]

You mean like this?

local mqtt = require("mqtt")
local json = require("json")

local client = mqtt.client("mqtt://broker.hivemq.com:1883")

client:setonmessage(function(topic, data)
  if topic ==  "ladowarka-lewa/cmd" then
    local msg = json.decode(data)
    if msg.method == "setCurrent" then
      evse.setchargingcurrent(msg.param)
    end
  end
end)

client:setonconnect(function()
  print("MQTT contected")
  client:subscribe("ladowarka-lewa/cmd")
end)

client:connect()

[dariusz737]

Thank you for prompt answer. Finally I have same progress. Why 10.1, not 10 :) , and how to send boolean to enable and disable charging. And how to send data from EVSE with "push" not periodically? Its so easy for you, I hope not to bothering you too much.

[dariusz737]

Ok. I have found answer for most questions. Expect one, how to "push" data on change. :)

[dzurikmiroslav]

Just manually test the values to static variables if a change and then publish new values. I don't know a better way.

[dariusz737]

Only to find out correct code :D

[dariusz737]

So, I am on the way with integration... I have already sensors, state, etc.. Will publish all after I will sort it out. Please let me know what does mean all states A1, B2, etc. I can't find explanation anywhere in docs.

[dzurikmiroslav]

They are states according to the J1772 specification https://en.wikipedia.org/wiki/SAE_J1772
The expansion of states according to the suffix 1-2 is inspired by the phoenixcontact AC charging controller:

(source: https://www.phoenixcontact.com/en-pc/products/ac-charging-controller-ev-cc-ac1-m3-cc-ser-pcb-1622460)

I think that for the needs of HA integration it is essential to know whether the EV is connected and whether it is charging:

  local payload = {}
  local state = evse.getstate()
  payload["session"] = state >= evse.STATEB1 and state <= evse.STATED2
  payload["charging"] = state == evse.STATEC2 or state == evse.STATED2

[dzurikmiroslav]

So that I don't forget evse.STATE{XX} constants copy the enumerator https://github.com/dzurikmiroslav/esp32-evse/blob/v0.10.1/components/evse/include/evse.h#L26, in Lua it is a numerical constant, so numerical comparation can be used...

[dariusz737]

Unfortunately this returns always 0
payload["charging"] = (state == evse.STATEC2 or state == evse.STATED2) and 1 or 0
I have changed it for:
local charging = (state == 4) and 1 or 0
I don't see relation between STATE, and number returned by - evse.getstate()
Any hint please :) ?

[dzurikmiroslav]

Can you provide the whole code?

[dariusz737]

Finally progress... However still a lot to do. I need to change NEXION for my needs. And I belive there is some issues with stability. Maybe worth to consider some kind of watchdog, and forced minimum charging current after restart? When will be ready I can add my HA integration to hour project with your help. I have GitHub, but not much familiar with it.

[Radwan-Alalili]

Hello there, I hope you doing well, you did a great work, thanks.

But I just want to know if I choose the small version which is the esp32 single phase, does the code work or it need some changes.

[dzurikmiroslav]

Yes, as I write in the README One firmware to rule them all :-) Everything else is configurable via board.cfg config.
You can use the web installer and then edit the board.cfg via the Web UI.