CoAP discovery handler #346

jiayihu · 2021-07-01T17:01:33Z

What this PR does / why we need it: it adds support for the CoAP protocol, which is an important protocol for RESTful IoT devices.

Special notes for your reviewer:

If applicable:

this PR contains documentation
this PR contains unit tests
added code adheres to standard Rust formatting (cargo fmt)
code builds properly (cargo build)
code is free of common mistakes (cargo clippy)
all Akri tests succeed (cargo test)
inline documentation builds (cargo doc)
version has been updated appropriately (./version.sh)

bfjelds · 2021-07-01T19:46:29Z

deployment/helm/templates/custom-configuration.yaml

@@ -6,7 +6,19 @@ metadata:
 spec:
  discoveryHandler: 
    name: {{ required "A custom.configuration.discoveryHandlerName is required." .Values.custom.configuration.discoveryHandlerName }}
-    discoveryDetails: {{ .Values.custom.configuration.discoveryDetails }}


for custom-configuration, i think the intent is that .Values.custom.configuration.discoveryDetails be yaml that can implicitly be what you are describing explicitly below. if we make the explicit changes you have here, custom-configuration becomes coap-configuration (and can no longer be other configs)

this seems more like the start of a deployment/helm/templates/coap-configuration.yaml :)

Also the custom.configuration values should be added to a coap section of the values file: https://github.com/deislabs/akri/blob/main/deployment/helm/values.yaml. A coap-discovery-handler.yaml file should also be added instead of using the custom one.

kate-goldenring

Thanks for this great work @jiayihu! See my comments for my main questions around multicast discovery and async coap client. Also, can you add a coap-configuration.md document under the docs folder to explain installation and the discoveryDetails parameters provided for filtering? For example, here is the one for ONVIF. Finally, are you interested in CoAP being able to be compiled into the agent? If so, I can point out where those changes need to happen in a subsequent PR.

kate-goldenring · 2021-07-01T20:09:29Z

docs/proposals/coap.md

+
+  The Broker acts as an HTTP-to-CoAP Proxy. It translates RESTful HTTP requests into RESTful CoAP requests and vice versa for the response. "Cross-Protocol Proxying between CoAP and HTTP" is defined in section 10 of RFC 7252. Currently, the Broker forwards only GET requests.
+
+  The Broker is also in an excellent position to cache CoAP responses. "Unlike HTTP, the cacheability of CoAP responses does not depend on the request method, but it depends on the Response Code." Currently, the Broker only caches CoAP responses with status code equal to `2.05 Content`, which is returned if the device is not reachable during the connection.


nit: remove extra � character here: 2.05 Content�

Sorry what character are you referring to?

Weird. It shows up on mine:

docs/proposals/coap.md

kate-goldenring · 2021-07-01T20:14:37Z

docs/proposals/coap.md

+
+- Is there a better way to store the discovered resources as Configuration in the cluster?
+
+The current implementation would need a controller to accept queries about available resources and return the name of the Broker's service which can communicate to the device. The device is listed as a generic `akri.sh/coap-021dd7` resource on the node, which is too generic to be useful by any application. A better label would be `akri.sh/oic.r.temperature-021dd7`, the discovered resource. This would allow using the K8s controller for scheduling pods that need the resource.


For this, someone could deploy a configuration named oir.r.tempurature and filter for specifically temperature devices right?

That is definitely an idea but the number of resource types is quite huge. Besides, as cluster administrator, who deploys the configurations, you may not know them in advance. Imagine you tasked to set up the clusters of a company with several geographical locations. It also means that you need two separate configurations, thus duplicate discovery handlers, for a same device that exposes both temperature and brightness as resources.

With that being said, I like the idea. It should also already be supported by using the queryFilter discoveryDetail like this:

queryFilter: name: "rt" // resource type value: "oic.r.temperature"

It's part of the CoAP standard that the devices can supported filtering by using a query filter. Moreover, my understanding of the RFC is that it supports only one filter. Even though I've implemented it, I never actually thought about using it for my use case 😄 It remains a workaround local deployments though, IMO.

what do you mean by ", thus duplicate discovery handlers"? There would still only be one coap DH running on the node but it would be called twice, once for each config

kate-goldenring · 2021-07-01T20:15:38Z

docs/proposals/coap.md

+
+### With Akri
+
+The Akri Configuration defines a list of IP addresses to use for resource discovery, implementing thus unicast discovery. Likewise, a multicast IP address can be used for multicast discovery. Both methods can be used at the same time.


What is a multicast example? Does an ip address always have to be provided or can a network scan be performed? Also static ip address are more of an aliveness check and resources supported by that device check rather than discovery, correct?

A multicast discovery is just a normal CoAP request sent to the special IP address 224.0.1.187 (in the case of IPv4) and with the broadcast flag on the IP packet. CoAP devices should be instructed to reply if they receive that kind of broadcast packet. The discovery handler only supports IPv4 multicast for now.

Static IP addresses are more for debugging or local clusters where you know which devices are available. I don't expect them to be used for real-world cases. That's why the default values.yml use multicast. For instance I use the static IP of my laptop during development, the IP of my local embedded device when actually testing the whole system.

That sounds great!

discovery-handler-modules/coap-discovery-handler/Dockerfile.discovery-handler

discovery-handler-modules/coap-discovery-handler/src/main.rs

discovery-handler-modules/coap-discovery-handler/Cargo.toml

discovery-handler-modules/coap-discovery-handler/src/discovery_utils.rs

samples/brokers/coap-broker/src/http_coap.rs

Cargo.lock

kate-goldenring · 2021-07-01T21:09:44Z

@jiayihu can you add some documentation on how to test your discovery handler? Do you happen to have a way you are mocking the coap devices?

jiayihu · 2021-07-07T22:29:46Z

Sure, I'll add more documentation. To mock the CoAP devices you can use coap-rs (I personally use node-coap because it's quicker to use an interpreted language for testing). Should I just provide the instructions in a .md file or setup an actual project? I think the latter would be better, but I'm not sure if you want something like that within the repo.

kate-goldenring · 2021-07-15T21:14:17Z

Sure, I'll add more documentation. To mock the CoAP devices you can use coap-rs (I personally use node-coap because it's quicker to use an interpreted language for testing). Should I just provide the instructions in a .md file or setup an actual project? I think the latter would be better, but I'm not sure if you want something like that within the repo.

Are you referring to only documentation on mocking the devices? What would go in the "project" you're suggesting? A coap-configuration.md file should come with this pr that explains how to configure a Configuration for coap. If you are willing, an end-to-end demo would be fabulous that shows how the configuration, discovery handler, and broker come together, like the ones for opc ua and udev.

kate-goldenring · 2021-07-23T20:29:17Z

@jiayihu give us a bump when you have addressed the comments and think this is ready for another round of reviews.

# Conflicts: # Cargo.lock

jiayihu · 2021-08-13T14:12:27Z

@kate-goldenring I think this is finally ready for a second review 🎉
I've seen that you've moved the doc to a separate repo. I can open a separate PR there after you have approved the files here.

kate-goldenring · 2021-08-17T17:46:35Z

@kate-goldenring I think this is finally ready for a second review 🎉
I've seen that you've moved the doc to a separate repo. I can open a separate PR there after you have approved the files here.

Hi @jiayihu, this is great to see! I've been on vacation the past few days, but I'll start taking a look this week! Another PR with docs on the docs site is perfect.

kate-goldenring · 2021-08-25T21:09:02Z

discovery-handler-modules/coap-discovery-handler/src/discovery_handler.rs

+                        let query_filter = query_filter.clone();
+
+                        tokio::task::spawn_blocking(move || {
+                            let mut shared_devices = shared_devices.lock().unwrap();


Maybe wait to lock shared_devices after making the call to discovery_endpoint

kate-goldenring

Thanks for adding in the configuration file, dockerfiles, and deployment yaml! Added some questions and comments about settings and docs. Haven't looked into the implementation yet. I'll look through that next.

kate-goldenring · 2021-08-27T13:53:21Z

deployment/helm/values.yaml

+        memoryRequest: 10Mi
+        # cpuRequest defines the minimum amount of CPU that must be available to this Pod
+        # for it to be scheduled by the Kubernetes Scheduler
+        cpuRequest: 10m


we should probably do an analysis using the vertical pod autoscaler as we did with other Akri components to determine good estimates here. Or we could leave out requests and limits for now and add an issue to do that.

kate-goldenring · 2021-08-27T13:53:59Z

deployment/helm/values.yaml

+    capacity: 1
+    discoveryDetails:
+      multicast: true
+      multicastIpAddress: 224.0.1.187


If this is the default for coap as explained in the configuration doc, should it ever be configurable?

kate-goldenring · 2021-08-27T13:54:05Z

deployment/helm/templates/custom-configuration.yaml

Is this some auto-linting? Can you undo to this and other irrelevant changes to other files.

kate-goldenring · 2021-08-27T13:54:09Z

deployment/helm/templates/coap-discovery-handler.yaml

+    spec:
+      containers:
+      - name: akri-coap-discovery
+        image: {{ printf "%s:%s" (required "A coap.discovery.image.repository is required." .Values.coap.discovery.image.repository) .Values.coap.discovery.image.tag | quote }}


Akri will host the image. set the value as done in reference udev-discovery-handler.yaml for an example

kate-goldenring · 2021-08-27T13:54:34Z

deployment/helm/templates/coap-configuration.yaml

+      {{- else }}
+      queryFilter: null
+      {{- end }}
+      discoveryTimeoutSeconds: {{ .Values.coap.configuration.discoveryDetails.discoveryTimeoutSeconds }}


is this used?

kate-goldenring · 2021-08-27T13:54:45Z

build/containers/Dockerfile.coap-discovery

+# Copy over container legal notice
+COPY ./build/container-images-legal-notice.md .
+
+RUN apt-get update && apt-get install -y --no-install-recommends libssl-dev openssl && apt-get clean


Same with broker: are libssl-dev and openssl needed? I dont remember why they were necessary in all of the other containers

kate-goldenring · 2021-08-27T13:54:59Z

build/containers/Dockerfile.coap-broker

+
+RUN apt-get update && apt-get install -y --no-install-recommends libssl-dev openssl && apt-get clean
+COPY ./target/${CROSS_BUILD_TARGET}/${BUILD_TYPE}/coap-broker /coap-broker
+ENV RUST_LOG=coap_broker,api


what is the api package?

kate-goldenring · 2021-08-27T13:56:06Z

docs/coap-configuration.md

+
+## Deploying the CoAP Discovery Handler
+
+In order for the Agent to know how to discover CoAP servers an CoAP Discovery Handler must exist. Akri supports an Agent image that includes all supported Discovery Handlers. This Agent will be used if `agent.full=true`.


This implementation doesn't support embedding coap in the Agent. A subsequent PR can add that support. For now, this section can be simplified to "The CoAP Discovery Handlers are deployed by specifying coap.discovery.enabled=true when installing Akri."

kate-goldenring · 2021-08-27T13:56:13Z

docs/coap-configuration.md

+
+Discovery Handlers are passed discovery details that are set in a Configuration to determine what to discover, filter out of discovery, and so on.
+
+By default, the CoAP Discovery Handler doesn't require any additional information as it implements the multicast CoAP discovery (described in [Section 8 of RFC 7252](https://datatracker.ietf.org/doc/html/rfc7252#section-8)). The IPv4 address reserved for "All CoAP Nodes" is `224.0.1.187`. Devices must support the default port `5683` as specified by the standard. At the time of writing, IPv6 multicast is not supported in the CoAP Discovery Handler.


Should this IPv4 address ever be configurable? When would it change?

kate-goldenring · 2021-08-27T13:56:17Z

docs/coap-configuration.md

+|---|---|---|---|
+| coap.configuration.discoveryDetails.multicast | boolean | true | Enable IPv4 multicast discovery | 
+| coap.configuration.discoveryDetails.multicastIpAddress | string | 224.0.1.187 | The IPv4 to which the Discovery Handler sends the packets | 
+| coap.configuration.discoveryDetails.staticIpAddresses | Array of strings | [] | Additional static IP addresses to look for during the discovery. | 


Can you add a description of when to use coap.configuration.discoveryDetails.staticIpAddresses

kate-goldenring

I just finished looking through everything and wow! This is some awesome work. The coap-demo.md was smooth. I was able to get through it without any problems! I've made a lot of comments about nits and conventions, but overall this is looking great. One more push and we should be there. Once you have addressed the docs comments, go ahead and put a PR into akri-docs. Another note, maybe run cargo clippy -p coap-discovery-handler and cargo clippy -p coap-broker to grab any syntax fixes.

kate-goldenring · 2021-08-30T16:47:10Z

docs/coap-configuration.md

+
+### Broker Pod Settings
+
+If you would like workloads ("broker" Pods) to be deployed automatically to discovered devices, a broker image should be specified in the Configuration. Alternatively, if it meets your scenario, you could use the Akri's default CoAP broker ("ghcr.io/deislabs/akri/coap-broker").


nit: remove "the" in "you could use the Akri's default CoAP broker"

kate-goldenring · 2021-08-30T16:49:49Z

docs/coap-configuration.md

+
+### Other settings
+
+The CoAP Discovery Handlers supports the same "Capacity" and "Automatic Service Creation" as OPC UA. Refer to the latter [documentation](https://github.com/deislabs/akri/blob/main/docs/opcua-configuration.md#disabling-automatic-service-creation) for additional information.


this is supported by all discovery handlers, but we are repeating the setting in each configuration file so they can be standalone. Can you copy and past that section into here, chaning opcua to coap where applicable?

kate-goldenring · 2021-08-30T17:07:59Z

discovery-handler-modules/coap-discovery-handler/src/discovery_handler.rs

+
+fn discover_endpoint(
+    coap_client: &impl CoAPClient,
+    ip_address: &String,


Is there a reason you aren't using &str?

kate-goldenring · 2021-08-30T17:15:00Z

discovery-handler-modules/coap-discovery-handler/Cargo.toml

+akri-discovery-utils = { path = "../../discovery-utils" }
+anyhow = "1.0.41"
+async-trait = "0.1.51"
+coap = { git = "https://github.com/Covertness/coap-rs" }


Can we point to their crate instead of GitHub repo. coap = "0.11"?

kate-goldenring · 2021-08-30T20:24:19Z

.github/workflows/run-test-cases.yml

@@ -62,7 +62,7 @@ jobs:
          BUILD_ARM64: 0
          BUILD_SLIM_AGENT: 0
          AGENT_FEATURES: "agent-full"
-          PACKAGES_TO_EXCLUDE: "akri-udev akri-onvif akri-opcua udev-video-broker debug-echo-discovery-handler onvif-discovery-handler opcua-discovery-handler udev-discovery-handler"
+          PACKAGES_TO_EXCLUDE: "akri-udev akri-onvif akri-opcua udev-video-broker coap-discovery-handler debug-echo-discovery-handler onvif-discovery-handler opcua-discovery-handler udev-discovery-handler"


This isnt needed, since it isnt a package in the Agent

kate-goldenring · 2021-08-30T22:01:34Z

docs/coap-demo.md

+## Deploy a Kubernetes application which requests the temperature via HTTP
+
+The Akri CoAP built-in Broker Pod is automatically deployed when an instance is created. The Broker exposes a RESTful endpoint which translates HTTP request to CoAP requests. To inspect the associated Kubernetes Service, run `kubectl get crd`.
+


should this be kubectl get services?

kate-goldenring · 2021-08-30T22:03:50Z

docs/coap-demo.md

+```
+kubectl run curl --image=radial/busyboxplus:curl -i --tty
+
+[ root@curl:/ ]$ curl http://akri-coap-920f97-svc/sensors/temp


specify that the id varies and should be changed when curling

kate-goldenring · 2021-08-30T22:05:53Z

samples/brokers/coap-broker/Cargo.toml

+coap-lite = "0.5"
+env_logger = "0.8.4"
+log = "0.4.14"
+tokio = { version = "1", features = ["full"] }


nit: specify specific features to minimize unused code

kate-goldenring · 2021-08-30T22:06:12Z

samples/brokers/coap-broker/Cargo.toml

+
+[dependencies]
+akri-shared = { path = "../../../shared" }
+coap = { git = "https://github.com/Covertness/coap-rs" }


specify crate instead of github

kate-goldenring · 2021-08-30T22:20:20Z

docs/coap-configuration.md

+| coap.configuration.discoveryDetails.multicast | boolean | true | Enable IPv4 multicast discovery | 
+| coap.configuration.discoveryDetails.multicastIpAddress | string | 224.0.1.187 | The IPv4 to which the Discovery Handler sends the packets | 
+| coap.configuration.discoveryDetails.staticIpAddresses | Array of strings | [] | Additional static IP addresses to look for during the discovery. | 
+| coap.configuration.discoveryDetails.queryFilter | { name: string, value: string } | {} | Single name-value pair to filter the discovered resource, as described in [Section 4.1 of RFC 6690](https://datatracker.ietf.org/doc/html/rfc6690#section-4.1) | 


Maybe break this out into two different fields for clarity, since it seems like the following is the appropriate was to configure the filter:

--set coap.configuration.discoveryDetails.queryFilter.name="rt" \ --set coap.configuration.discoveryDetails.queryFilter.value="oic.r.temperature"

kate-goldenring · 2021-08-30T22:37:22Z

Cargo.toml

@@ -8,13 +8,16 @@ members = [
    "shared", 
    "agent", 
    "controller", 
+    "samples/apps/coap-device",


I am not sure if this should live in akri as it is a mock device. I feel like the coap-demo.md is sufficient for getting people going. Or we could put it on a branch of akri, or you could host it if interested. @bfjelds for thoughts

kate-goldenring · 2021-08-30T22:39:22Z

discovery-handler-modules/coap-discovery-handler/Cargo.toml

+serde_json = "1.0.45"
+serde_derive = "1.0.104"
+serde_yaml = "0.8.17"
+tokio = { version = "0.2", features = ["rt-threaded", "sync", "time", "stream", "fs", "macros", "uds"] }


Nit: We recently went to tokio 1.0. Could you bump to that version? It isnt required since it is not embedded in the agent.

bfjelds · 2021-08-31T00:39:11Z

deployment/helm/templates/debug-echo-configuration.yaml

@@ -28,8 +28,6 @@ spec:
          cpu: {{ .Values.debugEcho.configuration.brokerPod.resources.cpuRequest }}
        limits:
          {{`"{{PLACEHOLDER}}"`}} : "1"
-          memory: {{ .Values.debugEcho.configuration.brokerPod.resources.memoryLimit }}


why was this removed?

bfjelds · 2021-08-31T00:41:12Z

discovery-handler-modules/coap-discovery-handler/Cargo.toml

+name = "coap-discovery-handler"
+version = "0.6.8"
+authors = ["Jiayi Hu <[email protected]>"]
+edition = "2018"


nit: 2018? should this be 2021?

bfjelds · 2021-08-31T00:49:54Z

samples/brokers/coap-broker/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "coap-broker"
+version = "0.1.0"


should the versions match our overall versioning ("0.6.14" ... or better yet "0.7.0")?

and update version.sh for each new Cargo.toml verion location?

bfjelds · 2021-08-31T00:52:19Z

there are a lot of //TODO comments. i wonder if these shouldn't be converted to issues?

jiayihu · 2021-08-31T15:50:27Z

Thank you to both of you for the comments. Unfortunately, vacation has ended and I'm not able to go back to the PR right now 🙃 It might take a while again

github-actions · 2021-11-30T00:01:27Z

PR has been automatically marked as stale due to inactivity for 90 days. Update the PR to remove label, otherwise it will be automatically closed."

romoh · 2021-12-08T17:35:30Z

@jiayihu, there have been a couple of changes since your PR. Let us know if you need help with rebase once you are ready to work on this again., we'll be glad to help.

github-actions · 2022-03-09T00:01:43Z

PR has been automatically marked as stale due to inactivity for 90 days. Update the PR to remove label, otherwise it will be automatically closed."

github-actions · 2022-07-05T00:02:24Z

PR has been automatically marked as stale due to inactivity for 90 days. Update the PR to remove label, otherwise it will be automatically closed."

jiayihu added 3 commits July 1, 2021 18:12

Add CoAP discovery handler implementation

f3b93f1

Integrate CoAP discovery handler to the build system

21d676b

Add CoAP proposal documentation

16dcb72

jiayihu requested review from bfjelds, Britel, jiria, kate-goldenring and romoh as code owners July 1, 2021 17:01

jiayihu changed the title ~~Coap~~ CoAP discovery handler Jul 1, 2021

Minor fixes

231cb60

bfjelds reviewed Jul 1, 2021

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kate-goldenring reviewed Jul 1, 2021

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Avoid using custom-configuration and discovery-handler

b5e58d6

jiayihu added 6 commits July 13, 2021 17:42

Remove deployment values

ddd5a8e

Fix PR comments

4a19654

Fix coap-broker integration

2bc91cf

Add CoAP discovery handler integration tests

8c9ebd2

Improve coap-broker error handling

191bbfe

Add coap-broker to version.sh

c629440

jiayihu force-pushed the coap branch from 6814aed to c629440 Compare July 26, 2021 21:20

jiayihu added 4 commits July 26, 2021 23:20

Merge branch 'main' into coap

365e562

Add CoAP configuration doc

acd9c51

Add CoAP demo

e87479b

Merge branch 'main' into coap

27bc9a4

# Conflicts: # Cargo.lock

Parallelize discovery for static addresses

647f475

Fix typos

6191cdf

kate-goldenring reviewed Aug 25, 2021

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kate-goldenring reviewed Aug 27, 2021

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kate-goldenring linked an issue Sep 7, 2021 that may be closed by this pull request

Support CoRE resource discovery protocol #192

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		The Broker acts as an HTTP-to-CoAP Proxy. It translates RESTful HTTP requests into RESTful CoAP requests and vice versa for the response. "Cross-Protocol Proxying between CoAP and HTTP" is defined in section 10 of RFC 7252. Currently, the Broker forwards only GET requests.

		The Broker is also in an excellent position to cache CoAP responses. "Unlike HTTP, the cacheability of CoAP responses does not depend on the request method, but it depends on the Response Code." Currently, the Broker only caches CoAP responses with status code equal to `2.05 Content`, which is returned if the device is not reachable during the connection.


		- Is there a better way to store the discovered resources as Configuration in the cluster?

		The current implementation would need a controller to accept queries about available resources and return the name of the Broker's service which can communicate to the device. The device is listed as a generic `akri.sh/coap-021dd7` resource on the node, which is too generic to be useful by any application. A better label would be `akri.sh/oic.r.temperature-021dd7`, the discovered resource. This would allow using the K8s controller for scheduling pods that need the resource.


		### With Akri

		The Akri Configuration defines a list of IP addresses to use for resource discovery, implementing thus unicast discovery. Likewise, a multicast IP address can be used for multicast discovery. Both methods can be used at the same time.


		## Deploying the CoAP Discovery Handler

		In order for the Agent to know how to discover CoAP servers an CoAP Discovery Handler must exist. Akri supports an Agent image that includes all supported Discovery Handlers. This Agent will be used if `agent.full=true`.


		Discovery Handlers are passed discovery details that are set in a Configuration to determine what to discover, filter out of discovery, and so on.

		By default, the CoAP Discovery Handler doesn't require any additional information as it implements the multicast CoAP discovery (described in [Section 8 of RFC 7252](https://datatracker.ietf.org/doc/html/rfc7252#section-8)). The IPv4 address reserved for "All CoAP Nodes" is `224.0.1.187`. Devices must support the default port `5683` as specified by the standard. At the time of writing, IPv6 multicast is not supported in the CoAP Discovery Handler.


		### Broker Pod Settings

		If you would like workloads ("broker" Pods) to be deployed automatically to discovered devices, a broker image should be specified in the Configuration. Alternatively, if it meets your scenario, you could use the Akri's default CoAP broker ("ghcr.io/deislabs/akri/coap-broker").


		### Other settings

		The CoAP Discovery Handlers supports the same "Capacity" and "Automatic Service Creation" as OPC UA. Refer to the latter [documentation](https://github.com/deislabs/akri/blob/main/docs/opcua-configuration.md#disabling-automatic-service-creation) for additional information.

		## Deploy a Kubernetes application which requests the temperature via HTTP

		The Akri CoAP built-in Broker Pod is automatically deployed when an instance is created. The Broker exposes a RESTful endpoint which translates HTTP request to CoAP requests. To inspect the associated Kubernetes Service, run `kubectl get crd`.

CoAP discovery handler #346

CoAP discovery handler #346

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bfjelds commented Aug 31, 2021

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