Custom component Nissan Leaf via LeLink 2 (ELM327) BLE

ESPHome
122

Hi all! Since Nissan disabled carwings for the Netherlands I decided to try this route. I’ve installed a GL-s10 and I was able to add a vgate obd dongle I had laying around. (The same as @128203ro) Everything looks to be working perfectly on the integration side, thank you for your work on this.

But I have one strange phenomenon. If I leave the OBD dongle plugged in, it won’t restart after the car has been powered off and then powered on again. At the moment I just replug the OBD dongle on my way to home so it connects as soon as I enter the driveway. But I thought the dongle should be starting with the car.

Hoe does this work for you?

123

Yeah, so what’s happening here:
When the dongle is plugged in, HA can communicate with it, but the dongle can’t talk to the car
HA <-----> Dongle <—X—> Car

In this scenario, HA polls occasionally (5 mins by default) in case the car happens to turn on.

When the dongle is unplugged or out of range, HA obviously can’t talk to it:
HA <—X—> Dongle <—?—> Car

In this scenario, when the dongle comes into range, HA is triggered by a BLE advertisement, which in turn kicks the integration to go a fetch data.
Note: just unplugging and replugging the dongle probably won’t trigger this, since I think the BLE discover layer needs to give up on reaching it. Not sure how long that takes.

The likely scenario is that when you have powered up the car, you need to wait for the next scheduled poll from HA (could be up to 5 mins). As a workaround, I added a button to trigger a sync on demand:

image
image614×248 8.7 KB

If you power up the car, you can try hitting this to get an immediate update.
If you don’t see this button, you might need to get the latest build from HACS.

124

Updates:

v0.3.1 — significant stability improvements. Have been testing this for several weeks and haven’t had a single lock-up.

v0.4.0b1 — pre-release: @128203ro have implemented, but not tested, a scheme for customising the decoders without needing the modify the python package. Please experiment.

2 Likes
126

Excellent!!! It works!!!

config/custom_components/nissan_leaf_obd_ble/overrides.yaml

XX:XX:XX:XX:XX:XX:
  commands:
    lbc:
      decoder:
        type: python
        function: my_lbc_decoder

config/custom_components/nissan_leaf_obd_ble/decoders.py

def my_lbc_decoder(messages):
    d = messages[0].data
    soc = int.from_bytes(d[30:34], 'big') / 10000
    health = int.from_bytes(d[28:30], 'big') / 102.4
    Ah = int.from_bytes(d[34:38], 'big') / 10000
    
    return {"state_of_charge": soc, "hv_battery_health": health, "hv_battery_Ah": Ah}
127

Ooh that’s cool!
I vibe coded the whole refactor, so I’m slightly amazed it works.