Pebble Watch Development with JavaScript

This article demonstrates how to create a Pebble watchface using the PebbleKit JavaScript Framework and the Foursquare API to display the address of the nearest Starbucks. It's designed for JavaScript developers, offering a blend of JavaScript and C code.

Key Concepts:

• PebbleKit JavaScript Framework: Enables dynamic interaction between Pebble apps and web services, expanding app capabilities.
• App Development Setup: Involves installing the Pebble SDK, creating a project, and configuring appinfo.json.
• appinfo.json Configuration: This file defines app metadata (UUID, name, version), capabilities (like location access), and app keys for inter-process communication.
• Foursquare API Integration: JavaScript fetches location data via the Foursquare API.
• Debugging: Uses pebble logs for JavaScript and APP_LOG for C code debugging.
• App Structure: The tutorial details the roles of JavaScript (for API interaction) and C (for Pebble app logic and UI).

Prerequisites:

• Pebble watch and associated smartphone app (iOS or Android).
• Foursquare API credentials.
• A Wi-Fi connection.

Project Setup:

1. Install the Pebble SDK: (Instructions are readily available in Pebble's documentation.)
2. Create a New Project: Use the command pebble new-project --javascript find_me_starbucks (or your chosen project name).
3. Project Structure: The generated project includes appinfo.json, resources (for images), src (for code), and wscript (build configuration).

appinfo.json Details: This file is crucial for defining app keys that map to data exchanged between JavaScript and the Pebble watch. For example:

{
  "uuid": "...", // Generated UUID - DO NOT USE THE EXAMPLE UUID
  "shortName": "Find Me Starbucks",
  "longName": "Find Me Starbucks",
  "companyName": "...", // Your Company/Developer Name
  "versionCode": 1,
  "versionLabel": "1.0.0",
  "watchapp": {
    "watchface": true
  },
  "appKeys": {
    "location": 0
  },
  "capabilities": ["location"],
  "resources": {
    "media": []
  }
}

C Code (src/find_me_starbucks.c): (The full C code is provided in the original article. This section focuses on the core functionality.) The C code handles UI elements (text layers for time and location), initializes AppSync for communication with the JavaScript, and processes messages received from the JavaScript to update the displayed location.

JavaScript Code (src/pebble-js-app.js): (The full JavaScript code is provided in the original article. This section highlights key aspects.) The JavaScript code uses the geolocation API to obtain the user's location, then makes an AJAX request to the Foursquare API to find nearby Starbucks locations. The location data is then sent to the Pebble watch via Pebble.sendAppMessage().

Running and Debugging:

1. Build: pebble build
2. Install: pebble install --phone IP_ADDRESS_OF_YOUR_PHONE (replace with your phone's IP)
3. Debugging: Use pebble logs --phone IP_ADDRESS_OF_YOUR_PHONE to view logs from both JavaScript and C code.

Further Exploration: The article suggests extending the app to allow user configuration of location preferences, potentially using a configuration window on the companion app.

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