Enable Azure Function MCP endpoints for telemetry and action requests

[Copilot]

Overview

Implements Azure Function endpoints with Model Context Protocol (MCP) support to handle telemetry requests and action commands for the Pi Chat application. The functions integrate with Azure Service Bus topics to enable asynchronous message processing.

Changes

Azure Functions Implementation

Created two HTTP-triggered Azure Functions using Node.js/TypeScript:

GetTelemetry Endpoint (POST /api/getTelemetry)

• Accepts telemetry requests with sensor key and date range
• Validates required fields: sensorKey, startDate, endDate
• Submits messages to the Service Bus "Telemetry" topic

SendAction Endpoint (POST /api/sendAction)

• Accepts action commands with type and specification
• Validates required fields: actionType, actionSpec (raw JSON string)
• Submits messages to the Service Bus "Action" topic

MCP Integration

• Added /api/mcp/info endpoint for server information
• Added /api/mcp/tools endpoint for tool discovery
• Both functions registered as MCP tools with proper schemas

Infrastructure Updates

Updated Azure Bicep templates to support the new architecture:

• Migrated from Service Bus queues to topics ("Telemetry" and "Action")
• Configured Function App with Node.js 18 runtime
• Set up Service Bus connection string in function app settings

Testing

• Added comprehensive unit test suite with Jest
• 9 tests covering validation, success paths, and error scenarios
• All tests passing with proper Service Bus client mocking

Example Usage

Request Telemetry Data

curl -X POST https://<function-app>.azurewebsites.net/api/getTelemetry \
  -H "Content-Type: application/json" \
  -d '{
    "sensorKey": "sensor-123",
    "startDate": "2024-01-01T00:00:00Z",
    "endDate": "2024-01-31T23:59:59Z"
  }'

Send Action Command

curl -X POST https://<function-app>.azurewebsites.net/api/sendAction \
  -H "Content-Type: application/json" \
  -d '{
    "actionType": "turn-on-light",
    "actionSpec": "{\"brightness\": 100, \"color\": \"white\"}"
  }'

Deployment

The function app is ready for deployment via the existing Bicep templates. After infrastructure deployment, build and publish the functions:

cd functions
npm install
npm run build
func azure functionapp publish <function-app-name>

Closes #[issue-number]

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• cdn.functions.azure.com
  • Triggering command: node lib/install.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Enable Azure Function MCP endpoint</issue_title>
<issue_description>This azure function, should have an MCP trigger and enable the ability for the application to perform the following actions:

GetTelemetry - This endpoint should receive an object that called a TelemetryRequest which is a json based object. It should include the following:

SensorKey - string - The identify for the sensor
StartDate - The start date for the telemetry request
EndDate - The end date for the telemetry request

It should take this json object, and submit it as a message against the service bus topic "Telemetry".

Send Action - This endpoint should receive an object called "ActionRequest" which is a json based object. It should include the following:

ActionType - The action key to indicate what it is being told to do.
ActionSpec - A string object, which will hold raw json to be processed by the service

It should take this json object, and submit it as a message against the service bus topic "Action"</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #3

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[KevinDMack]

Can you rewrite the functions from typescript to python.

[Copilot]

Pull Request Overview

This PR implements Azure Function endpoints with Model Context Protocol (MCP) support to handle telemetry requests and action commands for the Pi Chat application, migrating from Service Bus queues to topics for improved message distribution.

• Implements two HTTP-triggered Azure Functions (getTelemetry and sendAction) that validate requests and submit messages to Service Bus topics
• Adds MCP server endpoints for tool discovery and server information
• Migrates infrastructure from Service Bus queues to topics ("Telemetry" and "Action") with updated Bicep templates

Reviewed Changes

Copilot reviewed 15 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
infra/modules/serviceBus.bicep	Migrates from queue to topics architecture, creating "Telemetry" and "Action" topics
infra/modules/functionApp.bicep	Removes queue-specific configuration parameters
infra/main.bicep	Updates module calls to remove queue name parameter
functions/src/getTelemetry.ts	Implements telemetry request endpoint with validation and Service Bus integration
functions/src/sendAction.ts	Implements action command endpoint with validation and Service Bus integration
functions/src/mcpServer.ts	Provides MCP server info and tool discovery endpoints
functions/package.json	Defines dependencies and scripts for the Functions app
functions/test/*.test.ts	Comprehensive test suites for both function endpoints

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