[BUG] Auto Incline Out Of Sync - Zwift - Nordic Trac - 2.5 Offset

[cmgraz]

Describe the bug
The incline on the treadmill does not seem to follow closely to the incline in Zwift. It's very erratic, jumping up and down. It will get high when it's inclined up and lower when it declines, but on a progressive incline there's not a linear increase on my treadmill. It may go from 2 to 4 back to 2 when the whole time it's at 1 on Zwift.

To Reproduce
Steps to reproduce the behavior:

1. Open QZ app on S23 Ultra.
2. Open Zwift on Laptop. Connecct to KICKR RUN (name of S23 Ultra)
3. Start run at 7 MPH
4. Watch treadmill erratically incline/decline.

Expected behavior
I have a 2.5 offset in the settings. I would expect when I see 1% incline Zwift to be 3.5% on my treadmill. 2% Zwift = 4.5% on my treadmill. 5% zwift to be 7.5% treadmill. For a steady rate of 1% that slowly climbs to 2% I would expect never to see a drop on my treadmill.

Desktop (please complete the following information):

• Device: Running Zwift on a Lenovo Laptop which reads from the S23 Ultra.
• OS: Windows 11

Smartphone (please complete the following information):

• Device: [Samsung S23 Ultra] - Named KICKR RUN
• OS: [Android 14]

debug-Thu_Feb_6_19_27_15_2025.log

[cagnulein]

got the issue

disable the Zwift Treadmill Auto Inclination if you are using the KICKR RUN naming!
let me know!

[cmgraz]

I've tested and it appears things have changed, but still not right.

Maybe something is wrong with the offset?

I've attached another log.

debug-Fri_Feb_7_12_01_46_2025.log

Couple images worth pointing out. Below, before I even start. -3% is translating to 0.5. I would expect -3% to be -0.5%, which would be 0.

At 1:02 into the run, the incline on Zwift is 2% and my treadmill shows 3. I'd' expect it to show 4.5.

Another image. At 1:25 into the run, the incline on Zwift is still 2% and my treadmill is still 3.0. So it never corrects itself.

Another spot check later in the run on a climb. Zwift shows 6%. I'd expect to see 8.5 but rather I see 5.

I have a full video if that would be of any use.

[cagnulein]

you have gain to 0.5 and offset to 2
so the inclination recv from zwift is multiplied * 0.5 and + 2

so zwift sends 2.3 here

Fri Feb 7 12:04:06 2025 1738947846390 Debug: ../src/characteristics/characteristicwriteprocessor.cpp virtual void CharacteristicWriteProcessor::changeSlope(int16_t, uint8_t, uint8_t) "calculated erg grade 2.385"

qz is applying

Fri Feb 7 12:04:06 2025 1738947846515 Debug: ../src/devices/bluetooth.cpp void bluetooth::debug(const QString &) "writing incline 3"

because 2.3 * 0.5 = 3.15

it seems fine to me

[cmgraz]

Well my apologies!

I must have had that set based on a different tutorial I read!

I could have sworn I fixed it to 2.5 offset and Gain of 1. I'll retest with the new #s but imagine it will be spot on now.