S0 IoT Gateway

The S0 IoT Gateway is a robust and modular IoT Gateway for smart metering applications. Built around the ESP32-C6 microcontroller with a RISC-V core, it runs Zephyr RTOS and supports both Wireless M-Bus (wMBus) and wired M-Bus utility meters, transmitting collected data securely to Magistrala.

S0 = S0 Board + Baseboard — Zephyr RTOS

Looking for a Linux-based gateway? See the S1 Gateway, which combines the S0 Board with BeagleV-Fire.

Overview

S0 collects data from multiple wireless protocols and transmits it securely to the cloud. It integrates with Magistrala, a modern, scalable, open-source IoT platform.

Hardware Architecture

Core Components

Component	Description
ESP32-C6	Main microcontroller (RISC-V, WiFi, BLE)
RC-S2LP	Wireless M-Bus 868 MHz transceiver
SIM7080G	NB-IoT/LTE-M module
Ethernet	(Optional) local network through S0 Baseboard
USB-C & Terminals	For power and debug
GNSS Support	Optional via SIM7080G for asset tracking

The board is compact and optimized for IP-rated DIN-rail enclosures for industrial/outdoor environments. It features side-mounted IPEX connectors for each antenna (WiFi, GNSS, NB-IoT, wMBus).

Connectivity Options

Receive Data: WiFi, BLE, M-Bus, wM-Bus, I2C, SPI, UART
Transmit Data: NB-IoT, LTE-M, WiFi, Ethernet (via Base Board), 4G/5G

Power Management

The S0 board can be powered in 3 ways:

USB-C: For development and testing
Power JST: Battery of maximum 7.4V connected via the battery JST connector
Baseboard: The Baseboard supplies both 5V and 3.3V to the S0 board

Wireless Communication

WiFi/BLE: The ESP32-C6 provides 2.4GHz Wi-Fi and BLE. An IPEX connector on the ESP32-C6 accepts a 2.4GHz antenna of your choice.
Wireless M-Bus: The RC-S2LP module enables wireless M-Bus communication with wMBus meters at 868 MHz. An IPEX connector accepts a 868 MHz antenna.
NB-IoT / LTE-M: The SIM7080G module provides NB-IoT/LTE-M connectivity. Two IPEX connectors handle RF (wireless) and GNSS (GPS) antennas. The SIM7080G is controlled via AT commands from the ESP32.

Secure and modular firmware stack
Built-in protocol support (MQTT, CoAP, WebSockets, HTTP)
Open-source foundation for transparency and maintainability
Community-driven innovation

Magistrala Integration

Native integration with Magistrala IoT platform:

Seamless data ingestion and device management
Secure cloud connectivity
Open-source and patent-free
Scalable architecture

Software Features

The gateway firmware:

Collects meter data periodically from both wired and wireless M-Bus meters
Transmits structured data securely to Magistrala via MQTT
Manages reconnections and retry logic for unreliable NB-IoT networks
Logs diagnostics and status via UART or remote logging service

Supported communication protocols:

Protocol	Security	Description
MQTT	No	Lightweight messaging protocol for IoT data exchange
MQTTS	Yes	Secure MQTT communication over TLS (mTLS supported)
CoAP	No	REST-based protocol optimized for constrained devices
CoAP DTLS	Yes	Secure CoAP communication using DTLS encryption
HTTP	No	Standard web communication protocol
HTTPS	Yes	Secure version of HTTP over TLS
WebSockets	Yes	Full-duplex communication protocol over TCP