Overview · for Developers
Develop
Build on Proxus. Read and change its data over HTTP, subscribe to live values over MQTT, write C# functions and connect AI agents.
Proxus has several ways in for your own code. Each one serves a different job, so pick by what you want to do, not by the technology you know best.
Which interface to use
| You want to | Use | Runs on |
|---|---|---|
| List, create or change devices, profiles, rules, targets and other settings from a script | REST API (OData) | hub, port 8443 (HTTPS; 8080 for local access) |
| Read stored tag values for a report, a notebook or another system | Telemetry API | hub, port 8443 (HTTPS; 8080 for local access) |
| Receive live tag values the moment they are read | MQTT and the UNS topics | each edge gateway, port 8883 (TLS; 1883 without) |
| Calculate, filter or enrich values inside Proxus, poll a web service, raise your own alarms | Functions SDK (C#) | edge gateway |
| Load values recorded before the device was connected | Historical import | edge gateway, port 8083 |
| Let an AI assistant read the plant model and live state | MCP server | hub, /mcp |
How they fit together
Machine PLC, CNC, sensor
Edge gateway functions, MQTT broker, historical import
Hub REST API, Telemetry API, MCP
Your code scripts, apps, AI agents
Everything you do through the hub's interfaces runs as a Proxus user. The same roles and permissions that apply in the hub's screens apply to your code, so create a user with only the rights the integration needs. See Users and roles.
Start here
REST API Sign in, get a token and read or change any Proxus object over OData. Open Telemetry API Query stored tag values with SQL and get the rows back as JSON. Open MQTT and the UNS Subscribe to live values with any MQTT client, in JSON or Sparkplug B. Open Functions SDK Write C# code that runs on the gateway next to the machines. Open Historical import Send older readings of a device into the historian in batches. Open MCP server Connect an AI assistant to Proxus with the user's own permissions. Open
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