# Connecting devices to Edge

Source: https://cumulocity.com/docs/2026/edge/connecting-devices-to-edge/
Sector: Edge
Release: 2026
Description: Connect devices to Edge over REST, MQTT, or SmartREST 2.0, or through the OPC UA device gateway.

## Introduction

Edge uses REST and MQTT as protocols for external communication. Both protocols may be used to interface devices with Edge. For more information, see [REST](https://cumulocity.com/docs/2026/device-integration/device-integration-rest/) and [SmartREST 2.0](https://cumulocity.com/docs/2026/smartrest/smartrest-two/).

Additionally, Edge supports OPC UA protocol through the OPC UA device gateway and OPC UA management service.