Device Topology (Gateway-Subdevice)

Simple IoT supports parent-child device topology for gateway-to-subdevice scenarios (e.g., Modbus gateway + multiple slaves).

Data Model

The tb_device table has a parent_id field pointing to the parent device ID. One device has one parent, but a parent can have multiple children.

API

List child devices

GET /device/{parentId}/children

Response:

{
  "code": 200,
  "data": [
    {
      "id": 2,
      "deviceName": "Modbus Slave 1",
      "deviceKey": "modbus-slave-01",
      "parentId": 1
    }
  ]
}

Frontend

1. Go to Device Management
2. Click a gateway device's "Details"
3. Switch to the "Child Devices" tab

Typical Scenarios

• Modbus Gateway: gateway polls multiple Modbus slaves, each slave is a child device
• LoRa Gateway: gateway receives data from multiple LoRa nodes
• Edge Gateway: edge gateway proxies multiple local devices