A sensor can keep taking measurements after cellular coverage disappears. Without an available connection, however, those readings and alerts never reach the person who needs to act. This happens on farmland far from towns, at an isolated storage tank, or along a vehicle’s route through areas without mobile service. The device remains powered, but the last update on the monitoring platform gets older and older.
Satellite IoT offers a practical option: compatible devices can use a satellite link to transmit data beyond the reach of cellular networks. For a business, this opens up monitoring opportunities at sites that have been difficult to connect, potentially reducing the need for manual visits. The outcome depends on the complete system: sensors, antenna, firmware, power supply, connectivity service and the software receiving the messages.
A sign of this market’s development came in Nordic Semiconductor’s announcement on August 6, 2026: the LooUQ MTC2-N9151 embedded modem, based on the nRF9151, received Skylo certification for NTN satellite connectivity. It provides an integration platform that combines cellular and satellite communication and simplifies product development.
At a glance
- A satellite link can carry readings and alerts beyond cellular coverage, with compatible hardware and an enabled service.
- Agriculture, isolated infrastructure and logistics are applications in which to assess sensors with hybrid connectivity.
- Firmware, energy consumption, antenna design and data handling determine how useful and sustainable the solution will be in the field.
When cellular coverage is missing, the problem becomes operational
Consider a pump supplying an irrigation system. A sensor detects an abnormal pressure drop, but the modem cannot connect. The alert remains on the device while the operator continues to see an earlier reading. If the platform does not clearly distinguish recent data from stale data, a communication failure can even look like normal operation.
Storing readings locally allows the history to be recovered when connectivity returns. That is essential, but responding while a fault is occurring also requires an available communication path. This is where a second connection option becomes valuable: it increases the opportunities for useful information to reach its destination.
The assessment must cover the network the device will actually use. Signal bars on a smartphone do not establish whether a sensor can access the intended cellular service with its particular modem, SIM and installation.
How satellite IoT works with NTN networks
NTN stands for Non-Terrestrial Network. In the solution discussed here, the device communicates by radio with a satellite; the traffic then passes through ground infrastructure and the operator’s network to the receiving service. Skylo’s network integration documentation describes an architecture that complements cellular networks using existing geostationary satellites.
A product can therefore be designed with two paths: the cellular network when available, and a satellite connection under supported conditions. Switching depends on compatibility between the modem, firmware, antenna and operator service. The application must still handle connection times, failed transmissions and periods when neither path is usable.
Two possible telemetry paths. The satellite relays data towards ground infrastructure, and the backend makes it available to the dashboard. Conceptual diagram, not to scale: the NTN path requires service coverage, a suitable radio path and an enabled device. If both connections are unavailable, firmware stores readings locally within the available memory capacity.
NB-NTN provides narrowband connectivity for compact messages such as a reading, a status update or a position. Product design should start with the information that is essential and the time within which it is needed. Sending a meaningful event can be far more useful than trying to transmit every sensor sample over satellite.
What the LooUQ modem based on nRF9151 changes
The Nordic nRF9151 is a System-in-Package integrating an application processor and a modem supporting LTE-M, NB-IoT and NB-NTN. LooUQ uses it as the foundation of its MTC2-N9151, designed for integration into a device. Developers can start evaluating an existing communication platform and focus their work on the product and its application.
Certification of the underlying platform reduces some of the integration and verification work. The finished product still needs to be assessed in its actual configuration, including its enclosure, antenna and firmware. Skylo distinguishes between chipset, module and device certification: the applicable process should be agreed before planning production.
The Remsight example: water monitoring in the American West
Nordic’s announcement cites Remsight, which uses the MTC2-N9151 in its HydroProxy platform to monitor irrigation infrastructure in the American West. Its solar-powered sensors operate in locations where cellular coverage is unreliable.
The system described by Remsight combines field measurements, hybrid telemetry and map-based dashboards to support water managers. The practical benefit is easy to understand: observing distributed infrastructure without physically visiting every measurement point.
Applications: agriculture, remote infrastructure and logistics
Agriculture and irrigation
Reservoir level, pipe flow, irrigation pressure and pump status remain useful measurements even when a field is far from a cell tower. An agricultural system can be designed to send key readings periodically and report threshold crossings, taking seasonality and the required operating autonomy into account.
Silicon LogiX can work on sensor acquisition, firmware development and the logic that decides when to transmit. Monitoring software can then associate readings with a site and its history, helping operators identify unusual consumption or conditions that require investigation.
Storage tanks, pumps and energy infrastructure
For an isolated tank, knowing the level and its trend may be sufficient. A pumping station may need operating hours, temperature and alarm status. Distributed energy installations and equipment in poorly served areas can also benefit from sending essential diagnostics, provided the site and service support the connection.
We can contribute by integrating existing electronics, processing data locally and transferring useful information to the backend. Machine protection and responses requiring guaranteed timing must remain local; the remote link provides visibility and maintenance support.
Logistics and asset tracking
A mobile asset may pass through areas with intermittent coverage. A hybrid tracker can be designed to send location, temperature or selected events according to the available network. Two functions must be distinguished: GNSS determines the position, while cellular or satellite connectivity carries it to the platform.
Silicon LogiX can develop acquisition logic, event storage and integration with business systems. Antenna placement is critical: a device inside a metal container requires a different assessment from a tracker mounted outside. Countries and service availability along the route also need to be checked.
Environmental monitoring and temporary installations
Weather stations, river-level measurements and instruments at isolated construction sites are further scenarios to assess. Feasibility depends on data volume, access to the installation and available energy. We can contribute through hardware and software prototyping, data acquisition and the diagnostic tools needed to understand the system’s behaviour during field trials.
Firmware must handle hours without a connection
Adding a compatible modem is one step in the project. A reliable product also needs a policy for what happens after each measurement: which data to retain, which events take priority, when to attempt a connection and how long to keep retrying. These are application decisions based on operational requirements.
One possible strategy uses timestamped readings, a persistent queue and message identifiers. The backend can then recognise retransmissions and delayed data. The queue needs a defined capacity and a policy for handling a full buffer while preserving the events most useful to the process.
The dashboard must also make this distinction visible. “Last received value” and “current state” are not always the same thing. Showing measurement time, receipt time and prolonged gaps between updates helps users interpret an alert correctly. This is a central consideration when developing dashboards for operational monitoring.
Power consumption: validate the complete operating cycle
At a remote site, replacing a battery may take longer than collecting a sensor reading. Evaluating autonomy requires measuring a representative cycle: acquisition, processing, network search, attachment, transmission and any subsequent retries. Low sleep current alone does not describe the behaviour of the complete device.
In our firmware work, we can set separate acquisition and reporting intervals, combine several readings into a message and limit repeated network searches. The objective is to keep important information available within a measured energy budget. If the design includes a solar panel, sizing must also account for energy storage, seasons and periods with limited sunlight.
Coverage, antennas and costs: what to check before prototyping
The first check concerns the installation site. The official Skylo coverage map is a starting point, but availability must be confirmed with the provider for the country, service and device selected. A project in Italy needs that specific assessment; a deployment in the United States does not establish feasibility at another location.
The second check concerns the antenna and its view towards the satellite. Buildings, terrain, vegetation and enclosures can obstruct the radio path. A sensor in an underground chamber or a metal cabinet may require an external antenna in a suitable position. Tests should use the intended mounting arrangement because orientation and the surroundings affect performance.
Cost includes the connectivity service as well as hardware. Skylo states that SIMs and data plans are generally available through operator partners. A quotation should reflect the intended usage: device count, messages, data volume and contract terms. Installation, testing, certification and maintenance also belong in the comparison.
Finally, measure the time between an event and its receipt. Periodic readings may tolerate a substantial delay, while an urgent alert has different requirements. Test criteria should include delivered messages, delivery times, energy consumed and behaviour when both connections are unavailable.
Satellite IoT frequently asked questions
Can a sensor transmit without cellular coverage?
Yes, with hardware and firmware compatible with a satellite network, an active service and suitable radio conditions. Having a cellular modem alone does not guarantee that capability.
Does satellite connectivity work indoors or underground?
Feasibility depends on the radio path and installation. Shielded locations need an assessment of how to place the antenna in a suitable position. Testing at the site is part of the project.
Is it suitable for video, remote access or large updates?
The NB-NTN connection discussed here should be sized for small data exchanges. Video, interactive sessions and large transfers require a different assessment. Firmware updates also need a strategy consistent with the available connection.
Can an existing device be adapted?
It can be assessed by checking interfaces, power supply, antenna space and access to the firmware. An initial review can establish whether to integrate a modem, add a gateway or change the device architecture.
How Silicon LogiX can turn the requirement into a project
The starting point is to describe what becomes invisible when the signal disappears: a reading, a fault, an asset’s location or the status of an installation. We can then define reporting frequency, acceptable delay, autonomy and installation conditions, comparing satellite connectivity with the other options available for that setting.
Silicon LogiX can support firmware development, sensor and modem integration, power optimisation and prototype testing. On the software side, we can build IoT platforms and device management systems, backends, historical data storage and dashboards with notifications and diagnostics. The development path depends on the hardware, documentation and services available to the project.
A useful first trial connects a representative sensor to the platform and measures its behaviour at the intended site. The result supports a decision on whether to proceed, what needs adjustment and which costs to consider before deploying more devices.
Official references
- Nordic Semiconductor, August 6, 2026 announcement: LooUQ modem certification and the Remsight application.
- Nordic nRF9151 and LooUQ MTC2-N9151: platforms and supported connectivity.
- Remsight: sensors, connectivity and tools for water management.
- Skylo, network architecture and integration.
- Skylo, geographical coverage and FAQs on services, SIMs and certification.
Does your installation stop reporting when the signal disappears?
Tell us where it is, which readings or alerts you need to receive and how the device is powered. We can use these details to assess connectivity, firmware and monitoring, and define an initial feasibility trial.
Discuss your IoT project beyond cellular coverage
Originally published on Silicon LogiX.
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