Troubleshooting Connections
If Rostoc fails the connection test or shows a “Device not found” error, work through the steps below.
Start with your symptom
Section titled “Start with your symptom”| Symptom | Where to go |
|---|---|
| The connection test fails or Rostoc shows “Device not found” | Work through the sections on this page |
| Connected, but no readings — temperatures missing or the live Curve stays flat | Connected But No Readings |
| Live readings lost their colour — numbers show but look greyed out | Greyed-out readings and degraded status |
| Settings shows an amber status dot or “Telemetry degraded” | Greyed-out readings and degraded status |
| It worked before, then stopped after a restart or router change | Router Changed The Machine IP |
| The connection drops in the middle of a roast | If the connection drops during a roast |
| Live readings work, but a control is missing or rejected | Machine controls |
| A brand-specific setup problem | The brand guide’s own troubleshooting: Kaleido, Probat, Santoker, Aillio Bullet |
If live temperatures work but a direct control is missing, rejected, or marked uncertain, the connection may still be healthy. Telemetry and direct control are separate capabilities. Check the exact model in the Machine catalog and follow the status and safety guidance in Machine controls.
USB / Serial connections
Section titled “USB / Serial connections”1. Check the cable and port
- Try a different USB cable — data cables and charge-only cables look identical but behave differently
- Try a different USB port on your computer
2. Check that the machine is on and ready
- Most machines need to be fully powered on and past their startup sequence before Rostoc can connect
- Some machines need to be in a specific mode (e.g. “idle” or “data output on”) — check your machine’s manual
3. Check for driver issues (Windows)
- Some machines require a USB-to-serial driver (CP210x or FTDI)
- Open Device Manager and look for any yellow warning icons under “Ports (COM & LPT)”
- Download the driver from your machine manufacturer’s website
4. Quit other roasting software
- Only one application can claim a serial port at a time
- Close Artisan, Cropster, or any other software that may be connected to the same machine
Network connections (Ethernet and Wi-Fi)
Section titled “Network connections (Ethernet and Wi-Fi)”1. Scan the network for the machine
- Open the machine’s connection settings and click Scan network under the IP address field. Rostoc checks every address on your computer’s local network for a machine answering on the connection’s port and lists what it finds — if the machine appears, pick it and the address is filled in. The scan runs only when you start it, never in the background.
- If nothing answers, check the port named in the drawer’s message: the scan asks about one port only, so a machine configured for a different port reports the same silence as a machine that is off. Correct the port, then scan again.
- If the machine still doesn’t appear, confirm its IP address the direct way: from its display, your existing setup, your router’s device list, or the machine documentation. If the address changed after a router restart, see Router Changed The Machine IP.
2. Check that the computer can reach the machine
- The computer and machine must be on the same local network — or, for a direct Ethernet cable, the computer needs a manual IP address in the machine’s subnet
3. Check for competing connections
- Close other roasting or logging software; many machines accept only one connection at a time
4. Check the network path
- Firewall or network security software can block local machine traffic — allow Rostoc when the operating system asks
- Prefer a wired connection over wireless bridges for production roasting; dropouts on a bridge look like machine faults
Bluetooth connections
Section titled “Bluetooth connections”1. Unpair and re-pair
- Remove the machine from your computer’s Bluetooth device list
- Put the machine back into pairing mode and let Rostoc discover it fresh
2. Check Bluetooth permissions (macOS)
- Go to System Settings → Privacy & Security → Bluetooth
- Make sure Rostoc is listed and allowed
Greyed-out readings and degraded status
Section titled “Greyed-out readings and degraded status”A machine can stay connected while its readings stop arriving. Rostoc shows that state rather than letting stale numbers pass for live ones.
- Readings lose their colour. When a stream stops updating, its value fades to grey in both the main window and Roast Studio. The number you see is the last one the machine actually sent, not a current reading.
- The status says why. Settings shows a warning status reading Telemetry degraded, followed by what Rostoc observed — for example, telemetry silent for five consecutive polls.
- The machine is not disconnected. Rostoc keeps reading and the readings come back on their own the moment the machine answers again. Only a longer silence disconnects the Machine.
This usually means the machine stopped answering rather than that anything is wrong with Rostoc: a roaster busy with its own controller, a crowded wireless link, or a probe that has stopped reporting. If it clears on its own within a few seconds, nothing needs doing. If it persists, treat it as a connection problem and work through the section for your connection type above.
If the connection drops during a roast
Section titled “If the connection drops during a roast”Keep roasting from the machine’s own controls first. The roast never depends on Rostoc staying connected, and the machine keeps running exactly as you set it.
What Rostoc does when readings stop mid-roast:
- Short interruptions recover on their own. Rostoc retries failed reads automatically, so a brief hiccup of a second or two usually passes without you noticing.
- Displayed temperatures hold the last received values until fresh readings arrive, so milestones you mark during a gap keep a usable temperature.
- Longer interruptions disconnect the Machine. If reads keep failing for several seconds — an unplugged USB cable, a machine powering off, a network dropout — Rostoc marks the Machine disconnected and Roast Studio shows the connection error. Rostoc does not reconnect on its own after this point.
- The recording timeline keeps running. The Batch clock is not reset by a disconnect, so anything you mark stays at the correct roast time.
What to do:
- Make your roast decisions at the machine. Reconnect only when it is safe to look away from the drum.
- Fix the physical link — reseat the USB cable, or restore the network — then reconnect the Machine from Rostoc.
- If you reconnect during the same recording, the Curve resumes at the correct elapsed time. The missing period stays as a gap in the Curve; readings from before and after the dropout are kept.
- Don’t abandon the Batch because of a gap. Finish the roast, mark Drop, and save — everything that was recorded stays with the Batch.
If dropouts repeat, prefer wired Ethernet over Wi-Fi or wireless bridges, and work through the connection sections above after the roast. Clicking Send Diagnostics after a dropout shares the exact connection history with Rostoc support.
Still stuck?
Section titled “Still stuck?”If none of the above helps, reach out. Include your machine model, operating system version, the connection type, and the exact error or control status Rostoc shows.
You can also click Send Diagnostics in the app after a failed connection test. It shares the connection details and recent logs with Rostoc support — nothing is sent until you click the button — and gives you a reference code to include when you write to us.
If telemetry works but a control is missing or rejected, see Machine controls and check the exact model page in the catalog.