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UDMI / Docs / Specs / Topology

Topology

Terminology

  • local networks: grouped communication patterns for on-prem systems
    • family: network property that defines things about the network (e.g. that an address should be of the form XXX.XXX.XXX.XXX)
    • properties: parameterization of the network, meanings defined by the network family
  • iot devices: devices that have a representation in the cloud model
    • networks: optional list of local networks the device connects to
    • direct devices: devices that have a direct (e.g.) MQTT connection without an intervening gateway
      • credentials: connection parameters for connecting to the intended cloud endpoint
    • proxy devices: devices that are proxied through a gateway to connect to the cloud
      • gateway: which gateway the device is proxied through
      • through: if multiple networks are present, indicates which one is used for proxying
  • pointset mapping: how devices represent the mapping from the semantic cloud names to on-prem local network references
    • ref: point-to-source mapping, format defined by the network type of the indicated gateway (only for proxy devices)

Example Topology

Example ZZ-ABC-ATL site topology. The solid lines form a communication tree, where there is exactly one path to the root (cloud). Dashed lines indicate "alternate" connections that might exist due to various on-prem redundancies. Specifically, if a node is connected to multiple networks there there is one primary connection, and the others would be represented as dotted lines.

%%{wrap}%%
flowchart LR
  D2[<u>DEV-02</u><br/>0x827323]
  D1[<u>DEV-01</u>]
  LG[<u>ALG-01</u><br/>0x712387<br/>plc-master]
  D3[<u>DEV-03</u><br/>plc-9<br/>192.168.1.3]
  D4[<u>DEV-04</u><br/>0x92a344<br/>192.168.1.2]
  IG[<u>GAT-01</u><br/>0xa982b7<br/>192.168.1.1]
  BN([<i>bacnet-10</i><br/>0x??????])
  MB([<i>modbus-alg-01</i><br/>plc-???])
  IP([<i>upnp</i><br/>192.168.x.x])
  IN([<i>internet</i>])
  CP[<b>Cloud Provider</b><br/>endpoint_url:???<br/>project_id/<i>???</i><br/>registry/<i>ZZ-ABC-ATL</i><br/>device/<i><u>IOT-ID</u></i>]
  D2 --> BN
  D4 --> IP
  D3 -.-> IP
  LG --> BN
  D4 -.-> BN
  D1 --> IN
  D3 --> MB
  IG --> IN
  BN --> IG
  IP --> IG
  IN --> CP
  MB --> LG
Loading

The corresponding encoded information provides all the details necessary to define the topology:

  • local networks
    • bacnet-10: family bacnet, network-number 10
    • modbus-alg-01: family modbus, baud 9600
    • upnp: family upnp
  • direct devices
    • DEV-01:
    • GAT-01:
      • network bacnet-10: address 0xa982b7
      • network upnp: address 192.168.1.1
  • proxy devices
    • DEV-02
      • gateway GAT-01
      • network bacnet-10: address 0x827323
    • DEV-03
      • gateway ALG-01 (through modbus-alg-01)
      • network modbus-alg-01: address plc-9
      • network upnp: address 192.168.1.3
    • DEV-04
      • gateway GAT-01 (through upnp)
      • network bacnet-10: address 0x92a344
      • network upnp: address 192.168.1.2
    • ALG-01
      • gateway GAT-01 (through bacnet-10)
      • network bacnet-10: address 0x712387
      • network modbus-alg-01: address plc-master
  • pointset mapping
    • DEV-01
      • points
        • master_frambibulator
    • DEV-02
      • points (meaningful to GAT-01)
        • abstract_air_handler: ref AV10.present_value
        • fixating_resonant_structure: ref BV2.present_value
    • DEV-03
      • points (meaningful to ALG-01)
        • reticulating_reticulator: ref reg-10
        • running_rabbit_speed: ref reg-21
    • DEV-04
      • points (meaningful to GAT-01)
        • figure_flambing: ref points.json#.points.figure_flambing.present_value