OBDII Connection Refused

[Soup2409]

Hi, i am trying to get the OBD charts working, have the widgets setup in hudiy dashboard:

20251223_20h34m01s_grim.png (55.43 KiB) Viewed 325 times

And i have managed to successfully pair the OBD reader in bluetoothctl

20251223_20h32m17s_grim.png (326.32 KiB) Viewed 325 times

I have also used the same MAC address in my main_configuration for the obd settings

The logs state multiple times:

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[2025-12-23 20:04:16.324259] [0x0000007f11fe1b20] [info]	[hudiy] [ObdDevice] failed to open obd transport.
[2025-12-23 20:04:16.324392] [0x0000007f11fe1b20] [info]	[hudiy] [ObdManager] opening device failed. Retrying...
[2025-12-23 20:04:24.151453] [0x0000007f11fe1b20] [error]	[hudiy] [ObdRfCommTransport] failed to connect, address: 01:23:45:67:89:BA, channel: 1, error: 111, message: Connection refused

Any help would be appreciated

[hudiy]

Hello,
which OBD-II dongle model are you using? The MAC address looks a bit unusual.

Quick tip: You can also pair your dongle directly through the Bluetooth menu in Hudiy.

[Soup2409]

One of these generic ones

https://www.amazon.co.za/gp/aw/d/B0DJMH ... asin_title

17665734126276926099242801360198.jpg (2.57 MiB) Viewed 318 times

Heres an actual pic. It didnt come with much documentation either. If the dongle is an issue do you have any suggested products instead

Also thanks for the tip did not know that

[Soup2409]

I should mention that i did manage to connect to the obd scanner with my phone and retrieve rpm with one of those free apps, so it does work

[hudiy]

If you paired via bluetoothctl, try to add the device to trusted list by executing below command in bluetoothctl

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trust 01:23:45:67:89:BA

Or you can remove existing pairing and pair with the device using Bluetooth menu in Hudiy. If that will not help, please post output of

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sdptool browse 01:23:45:67:89:BA

command (via terminal)

[Soup2409]

I have tried all the above including trusting in ctl as well as removing and then pairing in the hudiy UI

Sdptool returns

20251223_20h45m00s_grim.png (27.94 KiB) Viewed 259 times

[hudiy]

The UUID "00001101-0000-1000-8000-00805f9b34fb" visible in one of the previous screenshots is the UUID of SPP (Serial Port Protocol). It should be also visible in sdptool.

Could you please send us full logs from $HOME/.hudiy/log? You can zip the directory and then upload the zip file to this thread.

Please also post output of the

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sdptool records 01:23:45:67:89:BA

command.

[Soup2409]

Sorry for the absence

Output of sdptool record

20260111_13h52m33s_grim.png (51.55 KiB) Viewed 115 times

Logs attached but i very very recently switched to a read only system so not sure how this might affect the logs or if it affects the OBD handling?

[hudiy]

Thanks for the sdptool output. It looks like your dongle listens for RFCOMM traffic on channel 2. By default Hudiy uses channel 1. You can change the channel number in main_configuration.json: https://github.com/wiboma/hudiy/blob/ma ... ion.md#obd (rfcommChannel). Try changing rfcommChannel to 2 and check if Hudiy is able to communicate with your dongle. A restart of Hudiy is required for the change to take effect.

[Soup2409]

That worked, rebooted and it was flawless, thank you so much for the assistance and really efficient troubleshooting

And for hudiy itself lol

Screenshot_20260111_172427_Gallery.jpg (398.33 KiB) Viewed 99 times