Prototype a MQTT Source

[ctmphuongg]

Fixes #7207

Proposed Changes

(The main working files are cmd/mqttsource/main.go, config/tools/mqttsource/mqttsource.yaml, the rest is packages installed to use mqtt_paho, generated by using go get paho and go mod vendor)

• Install packages for mqtt_paho
• Prototype an mqtt container source

Notes: For testing

1. MQTT needs a source to listen from. For local testing, run this command to open the mosquitto mqtt broker for source.

docker run -it --rm --name mosquitto -p 1883:1883 eclipse-mosquitto:2.0 mosquitto -c /mosquitto-no-auth.conf

2. Keep the mqttsource running by go build the file and run

./main -source localhost:1883 -eventType mqtt.event -eventSource mqtt://localhost:1883 -topic "test-topic"

3. Send a message to the same topic, using

mosquitto_pub -t 'test-topic' -m '{"specversion" : "1.0","type" :"com.example.someevent", "id" : "1234-1234-1234","source" : "/mycontext/subcontext","data":{"msg":"hello world!"}}' -D PUBLISH user-property Content-Type application/cloudevents+json; charset=utf-8

4. The message will be logged and sent to sink.

[knative-prow]

Hi @ctmphuongg. Thanks for your PR.

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[knative-prow]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 56 lines in your changes are missing coverage. Please review.

Project coverage is 69.24%. Comparing base (7e1c082) to head (5038750).
Report is 48 commits behind head on main.

Files	Patch %	Lines
cmd/mqttsource/main.go	0.00%	56 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7919      +/-   ##
==========================================
+ Coverage   69.22%   69.24%   +0.02%     
==========================================
  Files         339      345       +6     
  Lines       19494    15999    -3495     
==========================================
- Hits        13494    11079    -2415     
+ Misses       5337     4243    -1094     
- Partials      663      677      +14     

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[Cali0707]

/cc @matzew

Not sure if you have any initial feedback here...

[ctmphuongg]

/cc @Leo6Leo

[Leo6Leo]

@ctmphuongg I will take a look today! Thanks for your PR!