Title: Horizon 7.0AT (TM704B) — speed commands scaled wrong in both unit modes, minus button increases speed

[stefanicai]

Device: Horizon 7.0AT, model TM704B (Australian unit, console displays km/h)
QZ version: 2.20.29 (Android, paid Play Store version)
Phone/OS: Google Pixel 10
What works: QZ connects reliably, reads speed/incline/metrics correctly, and CAN control the treadmill (start/stop and speed commands move the belt).
Problem 1 — speed commands land far too high, compounding per press:
With "Use Miles" OFF (km/h), speed step 0.1, starting at 0.8:
0.8 → 2.4 → 4.0 → 6.6 (one + press each)
The pattern fits a km/h→mph conversion error compounding through the read-back loop:

2.4 + 0.1 = 2.5 → ×1.609 ≈ 4.0
4.0 + 0.1 = 4.1 → ×1.609 ≈ 6.6

With "Use Miles" ON, starting at 0.5:
0.5 → 1.6 → 3.3 (one + press each)
Problem 2 — minus butto
user1.qzs.txt
n increases speed. With Use Miles ON, at 3.3 I pressed − and it went UP to 4.3. Same behaviour in km/h mode. At treadmill max speed, − does nothing. (Consistent with QZ computing the target from an inflated read-back value.)
Tried without success:

Speed step 0.5 and 0.1
Speed gain 0.62 (commands still wrong, − still increases speed)
"Use Miles" both on and off (numbers above)

See debug file (changed extension to be able to upload).

I can help test if you make any updates to the mapping. I'm assuming the commands sent by the app are mismatching what the treadmill is expecting. Note it's a slightly older model, from 2020-2021.

Thank you!

[cagnulein]

hi, i guess i already fixed in the closed beta. could you please
send me an email to roberto.viola83 at gmail.com indicating this ticket Thanks

[cagnulein]

@stefanicai I read your email, since the attached one is not a debug log, could you please share a debug log from the current one so I can check it? https://github.com/cagnulein/qdomyos-zwift/wiki/How-do-i-get-the-debug-log-in-case-something-doesn't-work%3F

[stefanicai]

These are from both days. Hope they help.

debug-Fri_Jun_12_11_52_13_2026.log

debug-Fri_Jun_12_11_53_55_2026.log

debug-Fri_Jun_12_11_58_06_2026.log

debug-Thu_Jun_11_23_23_39_2026.log

debug-Thu_Jun_11_21_42_08_2026.log

debug-Fri_Jun_12_11_59_51_2026.log

[cagnulein]

Thanks I will check them ASAP Roberto Viola I sometimes trade time with my daughter to help. If this was valuable, please support my time: https://buymeacoffee.com/cagnulein https://www.patreon.com/cagnulein/join https://paypal.me/cagnulein Software engineer and open source enthusiast, QZ Creator http://robertoviola.cloud http://qzfitness.com/ Il giorno ven 12 giu 2026 alle 06:08 stefanicai ***@***.***> ha scritto:

…

These are from both days. Hope they help. debug-Fri_Jun_12_11_52_13_2026.log <https://github.com/user-attachments/files/28864354/debug-Fri_Jun_12_11_52_13_2026.log> debug-Fri_Jun_12_11_53_55_2026.log <https://github.com/user-attachments/files/28864355/debug-Fri_Jun_12_11_53_55_2026.log> debug-Fri_Jun_12_11_58_06_2026.log <https://github.com/user-attachments/files/28864353/debug-Fri_Jun_12_11_58_06_2026.log> debug-Thu_Jun_11_23_23_39_2026.log <https://github.com/user-attachments/files/28864347/debug-Thu_Jun_11_23_23_39_2026.log> debug-Thu_Jun_11_21_42_08_2026.log <https://github.com/user-attachments/files/28864348/debug-Thu_Jun_11_21_42_08_2026.log> debug-Fri_Jun_12_11_59_51_2026.log <https://github.com/user-attachments/files/28864349/debug-Fri_Jun_12_11_59_51_2026.log> — Reply to this email directly, view it on GitHub <#4716?email_source=notifications&email_token=AAALYWCHOYG3K7XBPKMB7PT47N65JA5CNFSNUABIM5UWIORPF5TWS5BNNB2WEL2ENFZWG5LTONUW63SDN5WW2ZLOOQXTCNZSG42DONBZUZZGKYLTN5XKOY3PNVWWK3TUUVSXMZLOOSWGM33PORSXEX3DNRUWG2Y#discussioncomment-17274749>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAALYWGDFZZRF2GP752ZKAD47N65JAVCNFSNUABIKJSXA33TNF2G64TZHMZDSNBRGU3TINZXHNCGS43DOVZXG2LPNY5TCMBSGM4TONZTUF3AE> . You are receiving this because you commented.Message ID: ***@***.*** com>

[cagnulein]

Hi! Thanks for the detailed logs — they made the root cause clear.

What is happening:
Your JFTM 7.0AT with Force Using FTMS enabled interprets the FTMS Control Point speed commands as mph, even though the app is sending km/h. So when QZ sends 2.5 km/h, the treadmill reads it as 2.5 mph → runs at ~4.0 km/h. Each subsequent press compounds the error following the ×1.609 factor, and the minus button appears to increase speed because (X − 0.1) mph > X km/h for any value above 0.26.

A fix is ready in PR #4721. You can follow the build progress in the CI Actions run.

Google is very slow in these days, reviewing the app on the store, even the beta ones. For this reason, in order to check right now if the patch that I did is right, you can use the android build in the link (check at the bottom of the page in about 1 hour). In order to test it you need first to remove the current QZ version on your phone, install the one that you downloaded.
This version is a 15 minutes trial (you can restart it as many times as you want) and I can unlock it if you want, send me an email to roberto.viola83@gmail.com mentioning this ticket and that you are on android.

What you need to do once the build is available:

1. Install the new build from the Actions artifacts (or wait for the next release)
2. Open QZ settings → Horizon Treadmill Options
3. Enable Force Using FTMS (you likely already have this on)
4. Enable the new "Horizon 7.0AT speed fix (FTMS)" toggle right below it
5. Restart the app

After that, speed commands will be automatically converted from km/h to mph before being sent to the treadmill, so the belt speed will match what QZ displays.

[stefanicai]

Ah, yeah, that makes sense. Thank you. How often do you push new versions on Google Play? I'll wait for that if it's not long.

[cagnulein]

i usually don't push pr into master before a confirmation, so i strongly suggest to test this via github build. i can also unlock it of course for you

[stefanicai]

Yep, makes sense, I'll test it over the weekend and let you know

[stefanicai]

I can't find the artifact in that build. I assumed it was in the build android job, but none of the links there seem to work, some I don't have access to, others are 404 https://github.com/cagnulein/qdomyos-zwift/actions/runs/27402536034/job/80983728179

[cagnulein]

This https://github.com/cagnulein/qdomyos-zwift/actions/runs/27402536034/artifacts/7586481005

Be sure to be logged in on github

Let me know!

[stefanicai]

Looks better, but still not quite there. Inclination works well, adds 0.5 every time I hit + and removes the same when I use minus.

Speed increases 0.1 once, then does nothing as many times as I hit the plus sign. Minus removes 0.1 once, then does nothing as many times as I hit it. That independently on the step I have setup in setting. I tried with speed step of 0.5 and then 1.0. log is with 1.0. it ignores that and adds/removes 0.1 in both cases.

Iulian

[debug-Mon_Jun_15_21_59_48_2026.log](https://github.com/user-attachments/files/28954715/debug-Mon_Jun_15_21_59_48_2026.log)

[stefanicai]

debug-Tue_Jun_16_21_57_29_2026.log

[stefanicai]

I changed from the treadmill buttons a few times there, hope logs show that. Started at 0.8, used plus to increase, but it doesn't go more than once (to 0.9). I increased to 4, then used plus and minus on app a few times, the switched to 2 on the treadmill and used the app buttons from there. Sometimes plus works a few times, other only once. Minus works almost always, only not below 0.8, but the changes are not linear.

[cagnulein]

ok this treadmill is kind of stupid :D let me explain
before my last patch i was sending 0x3e so 0.998 and it was converting then in speed data to 0.9. fair enough i thought, let's send 0x3f so the next number, it will be 1.01 BUT instead it still sends back 0.9 from speed data! Let me try now adding a rounding and a +1 otherwise i would need to add a sort of static table speed for speed https://github.com/cagnulein/qdomyos-zwift/actions/runs/27617338516

[stefanicai]

I might checkout the code and play around with it myself to see if I can get something going, maybe using the desktop version, I think there was one. Should be able to iterate faster locally

[cagnulein]

ok you can create a PR and it will auto build the apk if you want, i can add as a collaborator in that pr if you want