Teltonika TRB256 IoT Gateway

Teltonika TRB256 IoT Gateway

TRB256 000000 450Mhz NB-IOT / CAT-M1 / CAT NB1 / NB2 Cellular Gateway / Smart Meter Gateway

The TRB256 is an industrial 4G LTE NB-IoT gateway designed to be applied to a broad range of IoT solutions. The device is equipped with multiple WAN interfaces, such as I/Os, RS232, RS485, and an Ethernet port, additionally boasting dual SIM functionality for continuous connectivity. This industrial-grade gateway also supports the 450 MHz frequency band, offering superior LTE signal penetration compared to standard frequencies, making it an optimal choice for a diverse range of M2M applications.

TRB256 Package Contents

SKU TRB256 Category Tags , ,


TRB256 IoT Gateway from TELTONIKA is a compact industrial LTE Cat M1/NB-IoT gateway equipped with an Ethernet port, a connector block which includes pins for I/O, RS232, RS485, GPS and RutOS software for advanced networking solutions.

  • 450MHZ BAND : Greater LTE signal penetration and increased connectivity coverage
  • DUAL SIM : Auto-failover, backup WAN, and more switching scenarios
  • INTERFACES : Ethernet, I/Os, and Serial (RS232, RS485) interfaces with 16-pin terminal block

Industrial NB-IoT gateway
The TRB256 is an industrial 4G LTE NB-IoT gateway designed to be applied to a broad range of IoT solutions. The device is equipped with multiple WAN interfaces, such as I/Os, RS232, RS485, and an Ethernet port, additionally boasting dual SIM functionality for continuous connectivity. This industrial-grade gateway also supports the 450 MHz frequency band, offering superior LTE signal penetration compared to standard frequencies, making it an optimal choice for a diverse range of M2M applications.

TRB256 IoT Gateway Specification


  • Mobile module: LTE Cat M1 /Cat NB1, NB2 / EGPRS (simultaneous operation of cellular and GNSS connectivity is not supported)
  • SIM switch: 2 SIM cards, auto-switch cases: weak signal, data limit, SMS limit, on roaming, no network, network denied, data connection fail
  • Status: Signal strength (RSSI), SINR, RSRP, RSRQ, EC/IO, RSCP, Bytes sent/received, connected band, IMSI, ICCID
  • SMS: SMS status, SMS configuration, send/read SMS via HTTP POST/GET, EMAIL to SMS, SMS to EMAIL, SMS to HTTP, SMS to SMS, scheduled SMS, SMS autoreply, SMPP
  • Black/White list: Operator black/white list
  • Band Management: Band lock, Used band status display
  • SIM idle protection Service: When working with devices with two SIM slots, the one not currently in use will remain idle until the device switches to it, meaning that no data is used on the card until then
  • APN: Auto APN
  • Bridge: Direct connection (bridge) between mobile ISP and device on LAN
  • Passthrough: Gateway assigns its mobile WAN IP address to another device on LAN


  • Ethernet: 1 x ETH port, 10/100 Mbps, compliance with IEEE 802.3, IEEE 802.3u, 802.3az standards, supports auto MDI/MDIX crossover


  • Routing: Static routing, Dynamic routing (BGP, OSPF v2, RIP v1/v2, EIGRP, NHRP), Policy based routing
  • Network protocols: TCP, UDP, IPv4, IPv6, ICMP, NTP, DNS, HTTP, HTTPS, SFTP, FTP, SMTP, SSL/TLS, ARP, VRRP, PPP, PPPoE, UPNP, SSH, DHCP, Telnet, SMPP, SNMP, MQTT, Wake On Lan (WOL)
  • VoIP passthrough support: H.323 and SIP-alg protocol NAT helpers, allowing proper routing of VoIP packets
  • Connection Monitoring: Ping Reboot, Wget Reboot, Periodic Reboot, LCP and ICMP for link inspection
  • Firewall: Port forward, traffic rules, custom rules
  • Firewall status page: View all your Firewall statistics, rules, and rule counters
  • Ports Management: View device ports, enable and disable each of them, turn auto-configuration on or off, change their transmission speed, and so on
  • Network topology: Visual representation of your network, showing which devices are connected to which other devices
  • Hotspot: Captive portal (Hotspot), internal/external Radius server, SMS authorization, internal/external landing page, walled garden, user scripts, URL parameters, user groups, individual user or group limitations, user management, 9 default customizable themes and option to upload and download customised hotspot themes
  • DHCP: Static and dynamic IP allocation, DHCP Relay
  • QoS / Smart Queue Management (SQM): Traffic priority queuing by source/destination, service, protocol or port, WMM, 802.11e
  • DDNS: Supported >25 service providers, others can be configured manually
  • Network backup: VRRP, Wired options, each of which can be used as an automatic Failover, Mobile
  • SSHFS: Possibility to mount remote file system via SSH protocol


  • Authentication: Pre-shared key, digital certificates, X.509 certificates, TACACS+, Radius, IP & Login attempts block
  • Firewall: Pre-configured firewall rules can be enabled via WebUI, unlimited firewall configuration via CLI; DMZ; NAT; NAT-T
  • Attack prevention: DDOS prevention (SYN flood protection, SSH attack prevention, HTTP/HTTPS attack prevention), port scan prevention (SYN-FIN, SYN-RST, X-mas, NULL flags, FIN scan attacks)
  • VLAN: Tag-based VLAN separation
  • Mobile quota Control: Mobile data limit, customizable period, start time, warning limit, phone number
  • WEB filter: Blacklist for blocking out unwanted websites, Whitelist for specifying allowed sites only
  • Access Control: Flexible access control of SSH, Web interface, CLI and Telnet


  • OpenVPN: Multiple clients and a server can run simultaneously, 27 encryption methods
  • OpenVPN Encryption: DES-CBC 64, RC2-CBC 128, DES-EDE-CBC 128, DES-EDE3-CBC 192, DESX-CBC 192, BF-CBC 128, RC2-40-CBC 40, CAST5-CBC 128, RC2-64-CBC 64, AES-128-CBC 128, AES-128-CFB 128, AES-128-CFB1 128, AES-128-CFB8 128, AES-128-OFB 128, AES-128-GCM 128, AES-192-CFB 192, AES-192-CFB1 192, AES-192-CFB8 192, AES-192-OFB 192, AES-192-CBC 192, AES-192-GCM 192, AES-256-GCM 256, AES-256-CFB 256, AES-256-CFB1 256, AES-256-CFB8 256, AES-256-OFB 256, AES-256-CBC 256
  • IPsec: IKEv1, IKEv2, with 14 encryption methods for IPsec (3DES, DES, AES128, AES192, AES256, AES128GCM8, AES192GCM8, AES256GCM8, AES128GCM12, AES192GCM12, AES256GCM12, AES128GCM16, AES192GCM16, AES256GCM16)
  • GRE: GRE tunnel, GRE tunnel over IPsec support
  • PPTP, L2TP: Client/Server instances can run simultaneously, L2TPv3, L2TP over IPsec support
  • Stunnel: Proxy designed to add TLS encryption functionality to existing clients and servers without any changes in the program’s code
  • DMVPN: Method of building scalable IPsec VPNs
  • SSTP: SSTP client instance support
  • ZeroTier: ZeroTier VPN client support
  • WireGuard: WireGuard VPN client and server support
  • Tinc: Tinc offers encryption, authentication and compression in it’s tunnels. Client and server support.


  • Supported modes: Router
  • Supported connection types: RS485, TCP


  • Supported modes: Client, Server
  • Supported connection types: TCP


  • Supported modes: Server, Client
  • Supported connection types: RS232, RS485, TCP
  • Custom Registers: MODBUS TCP custom register block requests, which read/write to a file inside the router, and can be used to extend MODBUS TCP Slave functionality
  • Supported data Formats: 8-bit: INT, UINT; 16-bit: INT, UINT (MSB or LSB first); 32-bit: float, INT, UINT (ABCD (big-endian), DCBA (little-endian), CDAB, BADC), HEX, ASCII

Data to Server

  • Protocol: HTTP(S), MQTT, Azure MQTT, Kinesis
  • Data to Server: Extract parameters from multiple sources and different protocols, and send them all to a single server

Modbus MQTT Gateway

  • Modbus MQTT Gateway: Allows sending commands and receiving data from MODBUS Master through MQTT broker


  • Supported modes: Station, Outstation
  • Supported connection types: RS232, RS485, TCP


  • DLMS Support: DLMS – standard protocol for utility meter data exchange. Support trough serial and TCP

Monitoring & Management

  • WEB UI: HTTP/HTTPS, status, configuration, FW update, CLI, troubleshoot, event log, system log, kernel log
  • FOTA: Firmware update from server, automatic notification
  • SSH: SSH (v1, v2)
  • SMS: SMS status, SMS configuration, send/read SMS via HTTP POST/GET
  • Call: Reboot, Status, Mobile data on/off, Output on/off, answer/hang-up with a timer
  • TR-069: OpenACS, EasyCwmp, ACSLite, tGem, LibreACS, GenieACS, FreeACS, LibCWMP, Friendly tech, AVSystem
  • MQTT: MQTT Broker, MQTT publisher
  • SNMP: SNMP (v1, v2, v3), SNMP Trap
  • JSON-RPC: Management API over HTTP/HTTPS
  • RMS: Teltonika Remote Management System (RMS)

IoT Platforms

  • Cloud of Things: Allows monitoring of: Device data, Mobile data, Network info, Availability
  • ThingWorx: Allows monitoring of: WAN Type, WAN IP, Mobile Operator Name, Mobile Signal Strength, Mobile Network Type
  • Cumulocity: Allows monitoring of: Device Model, Revision and Serial Number, WAN Type and IP, Mobile Cell ID, ICCID, IMEI, Connection Type, Operator, Signal Strength
  • Azure IoT Hub: Can send device IP, Number of bytes send/received, Temperature, PIN count to Azure IoT Hub server, Mobile connection state, Network link state, IMEI, ICCID, Model, Manufacturer, Serial, Revision, IMSI, SIM State, PIN state, GSM signal, WCDMA RSCP, WCDMA EC/IO, LTE RSRP, LTE SINR, LTE RSRQ, CELL ID, Operator, Operator number, Connection type

System Characteristics

  • CPU: Mediatek, 580 MHz, MIPS 24KEc
  • RAM: 128 MB
  • FLASH storage: 16 MB

Firmware / Configuration

  • WEB UI: Update FW from file, check FW on server, configuration profiles, configuration backup
  • FOTA: Update FW
  • RMS: Update FW/configuration for multiple devices at once
  • Keep Settings: Update FW without losing current configuration

Firmware Customisation

  • Operating System: RutOS (OpenWrt based Linux OS)
  • Supported languages: Busybox shell, Lua, C, C++
  • Development Tools: SDK package with build environment provided
  • GPL customization: You can create your own custom, branded firmware and web page application by changing colours, logos, and other elements in our firmware to fit your or your clients’ needs.

Location Tracking

  • GNSS: GPS, GLONASS, BeiDou, Galileo, and QZSS (simultaneous operation of GNSS and cellular connectivity is not supported)
  • Coordinates: GNSS coordinates via WebUI, SMS, TAVL, RMS
  • NMEA: NMEA 0183
  • NTRIP: NTRIP protocol (Networked Transport of RTCM via Internet Protocol)
  • Server Software: Supported server software TAVL, RMS
  • Geofencing: Configurable multiple geofence zones


  • RS232: Terminal block connector: TX, RX, RTS, CTS
  • RS485: Terminal block connector: D+, D-, R+, R- (2 or 4 wire interface)
  • Serial functions: Console, Serial over IP, Modem, MODBUS gateway, NTRIP Client

Input / Output

  • Input: 3 x Digital Input, 0 – 6 V detected as logic low, 8 – 30 V detected as logic high
  • Output: 3 x Digital Output, Open collector output, max output 30 V, 300 mA
  • Events: Email, RMS, SMS
  • I/O juggler: Allows to set certain I/O conditions to initiate event


  • Connector: 2-pin in 16-pin industrial terminal block
  • Input voltage range: 9 – 30 VDC, reverse polarity protection, surge protection +/-1 kV 50 µs max
  • Power consumption: Idle: <2 W, Max: <3.5 W

Physical Interfaces

  • Ethernet: 1 x RJ45 port, 10/100 Mbps
  • I/O’s: 3 x Configurable digital I/O in 16-pin terminal block
  • Status LEDs: 3 x connection status LEDs, 3 x connection strength LEDs, 1 x power LED, 1 x Eth port status LED
  • SIM: 2 x SIM slots (Mini SIM – 2FF), 1.8 V/3 V, double stacked SIM tray
  • Power: 1 x 16-pin terminal block
  • Antennas: 1 x SMA connector for LTE, 1 x SMA connector for GNSS
  • RS232: 4-pin in 16-pin terminal block (TX, RX, RTS, CTS)
  • RS485: 4-pin in 16-pin terminal block (D+, D-, R+, R-)
  • Reset: Reboot/User default reset/Factory reset button

Physical Specification

  • Casing material: Aluminium housing
  • Dimensions (W x H x D): 83 x 25 x 74.2 mm
  • Weight: 165 g
  • Mounting Options: DIN rail, flat surface placement

Operating Environment

  • Operating temperature: -40 °C to 75 °C
  • Operating humidity: 10% to 90% non-condensing
  • Ingress Protection Rating: IP30

Regulatory & Type Approvals

  • Regulatory: CE, UKCA, EAC, CB


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