More than one Cora device
A household can have more than one Cora Max. Two settings decide which one does what, so they do not duplicate each other's work, and a third thing worth knowing is what is shared between them at all.
What is shared, and what is not
| Shared across every device | Belongs to one screen |
|---|---|
| Tanks, readings and history | Its dashboard layout |
| Devices and their settings | Wi-Fi, brightness, audio |
| Journal, livestock, maintenance | Wake word and child lock |
| Alerts, thresholds, automations | Which tanks that screen shows |
| Plans and usage |
Changing a threshold on one device changes it everywhere. Rearranging a dashboard does not; each screen keeps its own layout, and the phone and Cora Max never share one.
Voice responder
Settings → Assistant & AI → Voice responder chooses which Cora device answers when you speak to the room. Only one answers, however many can hear you; set it to whichever unit is nearest where you usually stand.
Each device in the list shows the wake phrase it listens for, along with whether it is online. These are not all the same. A wake phrase is trained into the device itself, so different Cora models can listen for different ones. Read the phrase from the device's own row rather than assuming the household shares one.
Primary poller
Equipment on your network is read by a Cora Max. When more than one could read the same controller, they would otherwise poll it in parallel.
The primary poller is a per-tank choice of which device reads that tank's controller. In Cora Mobile, look for Polling primary beside the tank in Settings.
| Setting | Behaviour |
|---|---|
| A named device | It becomes the only Cora device that polls the controller, and it stays the primary even while it is offline: other Cora devices do not take over. Cora Mobile polls only while it is offline. |
| Any active (automatic) | Cora Mobile and any online Cora device share the work, so if one goes offline another carries on. Suitable for a single-device household. |
While a device you named is offline, a command that has to go through it does not run: Cora tells you the tank is set to use that device, that it is offline, and that nothing ran, so you can try again once it is back. If it will be offline for a while, choose another device or Any active (automatic).
Where each device's state is shown
Cora Max reports its own polling and voice state under Settings → Cora Max → Firmware → Device health & controls. See Devices and device health.
Written for Cora Max 0.28.60 and Cora Mobile 0.5.70. Last checked 2026-09-17.
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