Many licensed routers and gateways have a mobile (LTE) uplink. This page explains what works on a cellular connection today and what is still in development.
Your own SIM works today
A licensed router works with the SIM card and the operator you choose. You insert the SIM, set the mobile connection on the router itself (for example, the APN your operator gives you), and the router connects to Hermetry over that link like over any other. Hermetry needs no special setting for it.
What Hermetry does on a metered link
The router tells Hermetry when it is on its mobile (metered) uplink. Hermetry then protects your data allowance:
| Feature | On a metered link |
|---|---|
| Firmware updates | The device waits for another link unless Allow updates over LTE (mobile data) is on for the device or its profile. An update never starts while the device’s mobile data quota is used up. See Firmware updates (OTA). |
| Remote access to the router’s panel | You confirm first (“Open the panel over the mobile link?”), and the session is closed after 50 MB. See Remote access to a router’s panel. |
| Panel sessions list | Sessions over the mobile link are marked LTE. |
Readings, alarms and commands work the same on every link. Keep an eye on how much your devices send: every message uses mobile data. Lower the report rate of chatty devices, or use deadbands on the gateway, when data costs matter.
eSIM management (in development)
In development: Managing the eSIM of a licensed router from Hermetry is not available yet.
The feature in development will let administrators see a router’s eSIM chip and its operator profiles, download a new profile with an operator’s activation code, switch between profiles, and turn off, rename and delete them, with every operation recorded. Until it is released, manage eSIM profiles on the router itself, and use a physical SIM or an eSIM profile installed there.
You may see an eSIM button on a router’s device page in some installations. Do not rely on it until this page says the feature is available.
Troubleshooting
| Symptom | What to check |
|---|---|
| The router is online on Ethernet but not on LTE | The SIM, the APN and the operator’s data plan, on the router’s own panel. |
| A firmware update waits | The device is on LTE and updates over LTE are off for it (“Devices on a mobile (metered) link wait for another link unless updates over LTE are allowed for them.”). Turn on Allow updates over LTE (mobile data) or wait for a wired link. |
| A panel session closed by itself | It reached the 50 MB cap on the mobile link (reason lte_cap in Panel sessions). |