User Identification in MQTT Events

Overview

When sending data through MQTT, you can include user identification information in your messages to track which user or device originated the data.

Message Structure with User ID

{
  "user_id": "user@example.com",
  "device_id": "device-123",
  "timestamp": "2024-01-15T12:00:00Z",
  "data": {
    "temperature": 25.5,
    "humidity": 60,
    "pressure": 1013.25
  }
}

Field Descriptions

Field	Type	Required	Description
user_id	string	Yes	Email or unique identifier of the user
device_id	string	Yes	Unique device identifier
timestamp	string	Yes	ISO 8601 timestamp
data	object	Yes	Sensor data payload

Best Practices

1. Always include user_id for proper data attribution
2. Use consistent device_id format across your organization
3. Ensure timestamps are in UTC
4. Validate data before sending

Example

import paho.mqtt.client as mqtt
import json
from datetime import datetime

# MQTT Configuration
broker = "mqtt.grouplink.com.br"
port = 8883
topic = "data/sensors"

# Create message with user identification
message = {
    "user_id": "john.doe@company.com",
    "device_id": "sensor-001",
    "timestamp": datetime.utcnow().isoformat() + "Z",
    "data": {
        "temperature": 22.5,
        "humidity": 55
    }
}

# Publish
client = mqtt.Client()
client.connect(broker, port)
client.publish(topic, json.dumps(message))
client.disconnect()

See Also

• MQTT Introduction