[Feature #4793] Support MQTT protocol

.asf.yaml

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+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+github:
+  description: EventMesh is a new generation serverless event middleware for building distributed event-driven applications.
+  homepage: https://eventmesh.apache.org/
+  labels:
+    - pubsub
+    - event-mesh
+    - event-gateway
+    - event-driven
+    - event-streaming
+    - event-sourcing
+    - event-governance
+    - event-connector
+    - cloud-native
+    - serverless
+    - serverless-workflow
+    - esb
+    - message-bus
+    - cqrs
+    - multi-runtime
+    - microservice
+    - hacktoberfest
+  enabled_merge_buttons:
+    squash: true
+    merge: false
+    rebase: false
+  protected_branches:
+    master:
+      required_status_checks:
+        strict: true
+      required_pull_request_reviews:
+        dismiss_stale_reviews: true
+        required_approving_review_count: 2
+  # Attempt to make the auto-generated github emails more easily readable in email clients.
+  custom_subjects:
+    new_pr: "[PR] {title} ({repository})"
+    close_pr: "Re: [PR] {title} ({repository})"
+    comment_pr: "Re: [PR] {title} ({repository})"
+    diffcomment: "Re: [PR] {title} ({repository})"
+    merge_pr: "Re: [PR] {title} ({repository})"
+    new_issue: "[I] {title} ({repository})"
+    comment_issue: "Re: [I] {title} ({repository})"
+    close_issue: "Re: [I] {title} ({repository})"
+    catchall: "[GH] {title} ({repository})"
+    new_discussion: "[D] {title} ({repository})"
+    edit_discussion: "Re: [D] {title} ({repository})"
+    close_discussion: "Re: [D] {title} ({repository})"
+    close_discussion_with_comment: "Re: [D] {title} ({repository})"
+    reopen_discussion: "Re: [D] {title} ({repository})"
+    new_comment_discussion: "Re: [D] {title} ({repository})"
+    edit_comment_discussion: "Re: [D] {title} ({repository})"
+    delete_comment_discussion: "Re: [D] {title} ({repository})"
+notifications:
+    commits: [email protected]
+    # Send all issue emails (new, closed, comments) to issues@
+    issues: [email protected]
+    # Send new/closed PR notifications to dev@
+    pullrequests_status: [email protected]
+    # Send individual PR comments/reviews to issues@
+    pullrequests_comment: [email protected]
+    jira_options: link label worklog

.dockerignore

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+dist/
+build/

.gitattributes

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+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+*.sh text eol=lf
+gradlew text eol=lf
+*.{cmd,[cC][mM][dD]} text eol=crlf
+*.{bat,[bB][aA][tT]} text eol=crlf

.github/ISSUE_TEMPLATE/bug_report.yml

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+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+name: Bug report
+title: "[Bug] Bug title "
+description: If something isn't working as expected.
+labels: [ "bug" ]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        For better global communication, Please write in English.
+
+  - type: checkboxes
+    attributes:
+      label: Search before asking
+      description: >
+        Please make sure to search in the [issues](https://github.com/apache/eventmesh/issues?q=is%3Aissue)
+        first to see whether the same issue was reported already.
+      options:
+        - label: >
+            I had searched in the [issues](https://github.com/apache/eventmesh/issues?q=is%3Aissue) and found
+            no similar issues.
+          required: true
+
+  - type: dropdown
+    attributes:
+      label: Environment
+      description: Describe the environment.
+      options:
+        - Mac
+        - Windows
+        - Linux
+        - Other
+    validations:
+      required: true
+
+  - type: dropdown
+    attributes:
+      label: EventMesh version
+      description: Describe the EventMesh version.
+      options:
+        - master
+        - 1.10.0
+        - 1.9.0
+        - 1.8.0
+        - 1.7.0
+        - 1.6.0
+        - 1.5.0
+        - 1.4.0
+        - 1.3.0
+        - 1.2.0
+        - Other
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: What happened
+      description: Describe what happened.
+      placeholder: >
+        A clear and concise description of what the bug is.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: How to reproduce
+      description: >
+        Describe the steps to reproduce the bug here.
+      placeholder: >
+        Please make sure you provide a reproducible step-by-step case of how to reproduce the problem
+        as minimally and precisely as possible.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Debug logs
+      description: Anything else we need to know?
+      placeholder: >
+        Add your debug logs here.
+      render: Java
+    validations:
+      required: false
+
+  - type: checkboxes
+    attributes:
+      label: Are you willing to submit PR?
+      description: >
+        This is absolutely not required, but we are happy to guide you in the contribution process
+        especially if you already have a good understanding of how to implement the fix.
+      options:
+        - label: Yes I am willing to submit a PR!
+
+  - type: checkboxes
+    attributes:
+      label: Code of Conduct
+      description: >
+        The Code of Conduct helps create a safe space for everyone. We require that everyone agrees to it..
+      options:
+        - label: I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) *
+
+  - type: markdown
+    attributes:
+      value: "Thanks for completing our form!"

.github/ISSUE_TEMPLATE/documentation_related.yml

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+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+name: Documentation Related
+title: "[Doc] Documentation Related "
+description: I find some issues related to the documentation.
+labels: [ "documentation" ]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        For better global communication, Please write in English.
+
+  - type: checkboxes
+    attributes:
+      label: Search before asking
+      description: >
+        Please make sure to search in the [issues](https://github.com/apache/eventmesh/issues?q=is%3Aissue)
+        first to see whether the same issue was reported already.
+      options:
+        - label: >
+            I had searched in the [issues](https://github.com/apache/eventmesh/issues?q=is%3Aissue) and found
+            no similar issues.
+          required: true
+
+  - type: textarea
+    attributes:
+      label: Documentation Related
+      description: Describe the suggestion about document.
+      placeholder: >
+        e.g There is a typo
+    validations:
+      required: true
+
+  - type: checkboxes
+    attributes:
+      label: Are you willing to submit PR?
+      description: >
+        This is absolutely not required, but we are happy to guide you in the contribution process
+        especially if you already have a good understanding of how to implement the fix.
+      options:
+        - label: Yes I am willing to submit a PR!
+
+  - type: checkboxes
+    attributes:
+      label: Code of Conduct
+      description: >
+        The Code of Conduct helps create a safe space for everyone. We require that everyone agrees to it..
+      options:
+        - label: I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) *
+
+  - type: markdown
+    attributes:
+      value: "Thanks for completing our form!"

.github/ISSUE_TEMPLATE/enhancement_request.yml

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+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+name: Enhancement Request
+title: "[Enhancement] Enhancement title"
+description: I want to suggest an enhancement for this project
+labels: [ "enhancement" ]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        For better global communication, Please write in English.
+
+  - type: checkboxes
+    attributes:
+      label: Search before asking
+      description: >
+        Please make sure to search in the [issues](https://github.com/apache/eventmesh/issues?q=is%3Aissue)
+        first to see whether the same issue was reported already.
+      options:
+        - label: >
+            I had searched in the [issues](https://github.com/apache/eventmesh/issues?q=is%3Aissue) and found
+            no similar issues.
+          required: true
+
+  - type: textarea
+    attributes:
+      label: Enhancement Request
+      description: Describe the suggestion.
+      placeholder: >
+        First of all: Have you checked the docs https://github.com/apache/eventmesh/tree/develop/docs,
+        or GitHub issues whether someone else has already reported your issue?
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Describe the solution you'd like
+      description: Describe the suggestion.
+      placeholder: >
+        A clear and concise description of what you want to happen. Add any considered drawbacks.
+    validations:
+      required: true
+
+  - type: checkboxes
+    attributes:
+      label: Are you willing to submit PR?
+      description: >
+        This is absolutely not required, but we are happy to guide you in the contribution process
+        especially if you already have a good understanding of how to implement the fix.
+      options:
+        - label: Yes I am willing to submit a PR!
+
+  - type: checkboxes
+    attributes:
+      label: Code of Conduct
+      description: >
+        The Code of Conduct helps create a safe space for everyone. We require that everyone agrees to it..
+      options:
+        - label: I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct) *
+  - type: markdown
+    attributes:
+      value: "Thanks for completing our form!"