Initial survey of other discovery mechanisms (#514)

* Create add-rendered-implreport.yml * Update add-rendered-implreport.yml * Update add-rendered-implreport.yml * Delete add-rendered-implreport.yml * initial survey of other discovery mechanisms * Update other_mechs.md --------- Co-authored-by: Michael McCool <[email protected]>
w3c · Nov 6, 2023 · d7e1771 · d7e1771
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+# Survey of Other Discovery Mechanisms (DRAFT)
+
+## Current Introduction Mechanism
+
+- Direct
+- Well-known URIs
+- DNS-based service discovery (DNS-SD + mDNS)
+- CoRE Link Format and CoRE Resource Directory
+- DID Docuemnts
+
+## Other ecosystem's discovery mechanisms
+
+### MQTT
+
+- There is no standard mechanism for discovering MQTT broker.
+- [MQTT-SN (MQTT for sensor Netoworks)](https://www.oasis-open.org/committees/document.php?document_id=66091&wg_abbrev=mqtt)
+  - UDP-based
+  - Advertise a broker presense by ADVERTISE message.
+    - no information other than the gateway's ID can be sdvertised.
+- [MQTT Discovery in Home Assistant](https://www.home-assistant.io/integrations/mqtt/#mqtt-discovery)
+  - They have predefined topic for Discovery:
+    - `<discovery_prefix>/<component>/[<node_id>/]<object_id>/config` where:
+        - `discovery_prefix`: default to `homeassistant`
+        - `component`: `binary_sensor` etc.
+        - `node_id`: ID of the node
+        - `object_id`: ID of the device
+    - payload is serialized JSON object.
+
+### OPC UA
+- [Local Discovery Server]
+  - use mDNS to advertise Discovery Server. Similar approach to WoT Discovery.
+    - `_opcua-tcp._tcp.example.com. 86400 IN SRV 0 5 4840 uaserver.example.com.`
+    - `   TXT path=/discoveryURL,  caps=LDS,...`
+
+### Other protocol/platform/ecosystem
+- DHCP Options ([RFC2132](https://datatracker.ietf.org/doc/html/rfc2132))
+- SSDP ([draft-cai-ssdp-v1-03](https://datatracker.ietf.org/doc/html/draft-cai-ssdp-v1-03); expired in April 2000)
+- [WS-Discovery](https://docs.oasis-open.org/ws-dd/discovery/1.1/wsdd-discovery-1.1-spec.html)
+
+
+## How to incorporate new mechanism in WoT Discovery?
+- It might be good to initially collect proposals *with implementation* in the form of markdown document.  After that, we can decide whether to incorporate it into the spec.
+