Meet the Teltonika Oxa: A Credit-Card-Sized Embedded IoT Gateway for OEMs

For original equipment manufacturers, adding reliable cellular connectivity to a product has long meant choosing between two compromises. Custom module-level development offers a minimal footprint but demands serious engineering resources, complex certification and long development cycles. External boxed gateways are easier to deploy, yet often too bulky — and aesthetically mismatched — for sleek, integrated industrial designs.

The new Teltonika Oxa is the middle ground. It's a compact, embedded IoT gateway engineered specifically for OEM and industrial integrations: a fully functional, pre-certified networking board that manufacturers embed directly into their host equipment, with no module-level engineering required.

The Oxa is defined by its space efficiency — the board is roughly the size of a credit card, and four pre-drilled mounting holes (∅ 2.70 mm) let hardware architects secure it firmly inside a host chassis. Despite the size, it's rated for genuinely industrial environments:

Board-level doesn't mean bare-bones. The Oxa carries a versatile interface array:

• 4G LTE Cat 4 — up to 150 Mbps down / 50 Mbps up, with 3G and 2G fallback. An internal 2FF (Mini SIM) holder and a dedicated SMA connector for the mobile antenna.
• Gigabit Ethernet — a single 10/100/1000 Mbps port for high-speed local data transfer.
• Micro-USB “Virtual Network Interface” — local configuration and debugging without tying up the Ethernet port; a genuinely useful touch for engineers on the bench.
• Power + I/O on one connector — a 4-pin industrial DC socket (9–30 VDC) that also carries the hardware digital input and digital output (1x DI, 1x DO), simplifying wiring-harness design.
• 11 status LEDs — connection type, signal strength, LAN and power, positioned so enclosure designers can surface them through light pipes.

The Oxa runs RutOS — the same OpenWrt-based Linux environment as Teltonika's RUT routers and TRB gateways — on its 1.3 GHz Cortex-A7. That gives it far more headroom than a simple modem, and the software stack is built for industrial integration:

• Automation & energy: native Modbus (server/client), DNP3 (station/outstation), OPC UA and BACnet over TCP.
• Utilities: DLMS support for standard meter data exchange.
• Data handling: “Data to Server” parameter extraction, plus MQTT in both broker and publisher roles for modern IoT architectures.
• Custom applications: multiple programming languages, including Lua, C/C++, Java and Python; a Package Manager installs only the services your application actually needs.

Security is enterprise-grade out of the box: OpenVPN (27 encryption methods), IPsec (14 methods), WireGuard, ZeroTier and more for tunnelling, alongside a preconfigured firewall, VLAN separation and built-in prevention against DDoS, port scans and SSH attacks.

For deployments at scale, the Oxa is fully compatible with the Teltonika Remote Management System (RMS) — centralised management, real-time monitoring and firmware-over-the-air updates across large device fleets.

For device manufacturers, the Oxa's pitch is strategic rather than just technical:

• Faster time-to-market — skip the module-level development and certification cycle with a ready-to-integrate gateway.
• Branded firmware — GPL customisation lets OEMs re-skin the WebUI (colours, logos and more) to match their own identity.
• Modular software — install only the packages the application requires.
• Seamless embedding — connectivity integrates into the host product, with no external boxes or bulky mounting.

Teltonika's launch materials point at exactly the kind of deployment this suits: outdoor gates, turnstiles and barriers that need instant, secure access validation but sit far from wired infrastructure — an Oxa inside the controller delivers LTE connectivity without trenching, fibre or Ethernet runs.

If your project needs Teltonika-grade cellular connectivity now — or a DIN-rail / enclosed form factor rather than a board-level one — the TRB gateway family covers the same RutOS + RMS ecosystem in a rugged housing, from the ultra-small TRB160 to the 5G TRB501:

New to the brand? Start with our Teltonika Networks range guide, or see the hardware applied in the field in our industrial automation and energy & utilities use-case round-ups. Raspberry Pi builders should look at the CALYX cellular Pi HATs — a similar embedded-connectivity idea in HAT form.