pebble-app-ready-service

The AppReadyService adds an AppReady that fires when the app's JavaScript has successfully started, and sent a message to the C code. Developer's should wait for this event to fire before sending any AppMessages to the JavaScript.

Getting Stated

This package includes both C and JavaScript code. Information on how to install the package, and work with it in your JavaScript and C code are detailed below.

Installation

To install the package, run the following command from a Pebble project:

> pebble package install pebble-app-ready-service

JavaScript

After install the package, add the following to the start of your app.js code:

var AppReadyService = require('pebble-app-ready-service');

AppReadyService.ready(function() {
  // App is ready to communicate with C code
});

C Code

To use the package in your C code, you will first need to include the header file in your application:

#include "pebble-app-ready-service/app-ready-service.h"

After including the file, you can subscribe to the ready and timeout events by creating an AppReadyHandlers object, and then invoking the app_ready_service_subscribe method. This is typically done in your app's init code.

static void prv_app_ready(void *context) {
  // JavaScript is running, and ready to accept AppMessages
  // ...

}

static void prv_app_timeout(void *context) {
  // JS is not running (watch is likely disconnected)
  // ...

}

static void prv_init() {
  // Init code
  // ...

  // Subscribe to the ready service
  app_ready_service_subscribe((AppReadyHandlers){
    .ready = prv_app_ready,
    .timeout = prv_app_timeout
  }, NULL);
}

API Documentation

AppReadyHandlers

// Define the struct to hold our handlers
typedef struct AppReadyHandlers {
  AppReadyCallback ready;
  AppReadyCallback timeout;
} AppReadyHandlers;

The AppReadyHandlers struct is used to define the .ready and .timeout callbacks for the AppReadyService. The callbacks must be void functions with a void* context parameter.

void app_ready_service_subscribe(AppReadyHandlers handlers, void* context);

The app_ready_service_subscribe registers the supplied callback methods. The second parameter is a pointer to the context data the callback methods will use. If not context is required, NULL should be passed as the second parameter.

void app_ready_service_set_timeout(uint16_t timeout);

The app_ready_service_set_timeout methods allows you to change the default timeout period (5000 ms).

NOTE: If changing the timeout period, this method must be called before app_ready_service_subscribe.

License

This package is licensed under the MIT License.