如何在Cordova中调用cordova-plugin-hbbtv的SSDP功能进行测试？

Got it, let's break down how to tap into the SSDP functionality of this plugin since the official docs only focus on HbbTV features. I’ll walk you through this based on the plugin’s Android source structure you referenced:

1. First, Understand the Plugin's SSDP Native Code #

Looking at the src/android/ssdp directory, you’ll find core classes that power SSDP operations:

• SsdpClient: Handles the heavy lifting of starting/stopping discovery scans and listening for multicast responses
• SsdpService: A data class that represents a discovered SSDP service (holds details like service location, USN, and service type)
• SsdpListener: An interface that defines callback events for when services are found or lost

These classes are generic enough to work with any SSDP service, even though they’re used under the hood for HbbTV device discovery.

2. Check for Existing JS Bridge (or Build Your Own) #

Since the plugin doesn’t document SSDP-specific JS APIs, you have two paths:

• Look for hidden bindings: Check the plugin’s www folder or plugin.xml for unmentioned SSDP-related js-module or feature entries. If you find them, you can use those directly.
• Build a custom JS wrapper: If no pre-built bindings exist, use Cordova’s core cordova.exec() method to bridge your JS code to the native SSDP classes. Here’s a simple wrapper to get started:

Example Custom JS Wrapper #

Create a new file (e.g., www/ssdp-wrapper.js) with this code:

var SsdpWrapper = {
    // Start scanning for a specific SSDP service type
    startDiscovery: function(serviceType, onServiceFound, onError) {
        cordova.exec(
            onServiceFound,
            onError,
            "SsdpClient", // Match the native class name (verify the full package path!)
            "startDiscovery",
            [serviceType]
        );
    },

    // Stop ongoing discovery scan
    stopDiscovery: function(onSuccess, onError) {
        cordova.exec(
            onSuccess,
            onError,
            "SsdpClient",
            "stopDiscovery",
            []
        );
    }
};

module.exports = SsdpWrapper;

3. Update Plugin Configuration (If Needed) #

If the plugin doesn’t already register the SsdpClient as a Cordova feature, add this snippet to plugin.xml:

<feature name="SsdpClient">
    <param name="android-package" value="de.fraunhofer.fokus.hbbtv.ssdp.SsdpClient" />
</feature>

(Double-check the full package path of SsdpClient in the plugin’s source to ensure this matches exactly.)

4. Verify Required Android Permissions #

SSDP relies on specific network permissions to function properly. Confirm these are present in your AndroidManifest.xml (the plugin may already include them, but it’s worth verifying):

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_MULTICAST_STATE" />

The CHANGE_WIFI_MULTICAST_STATE permission is critical—without it, your Android device won’t receive SSDP multicast messages.

5. Test SSDP Discovery in Your App #

Here’s how to integrate the wrapper into your main Cordova app code:

// Import the wrapper (adjust the path to match your project structure)
var ssdp = require('./ssdp-wrapper');

// Replace this with the service type your Node.js SSDP server uses
var targetServiceType = "urn:your-custom-service-type:1";

// Start discovery once the Cordova device is ready
document.addEventListener("deviceready", function() {
    ssdp.startDiscovery(targetServiceType,
        function(discoveredService) {
            // Callback triggered when a service is found
            console.log("Found SSDP service:", JSON.stringify(discoveredService));
            // The service object will include fields like usn, location, st, and server
        },
        function(error) {
            console.error("SSDP discovery failed:", error);
        }
    );

    // Stop discovery when the app closes or navigates away
    window.addEventListener("beforeunload", function() {
        ssdp.stopDiscovery(
            () => console.log("SSDP discovery stopped"),
            err => console.error("Failed to stop discovery:", err)
        );
    });
});

6. Key Testing Tips #

• Ensure your Android device and Node.js SSDP server are on the same local network.
• Some Android devices disable multicast by default—check your device’s network settings or confirm the plugin’s SsdpClient handles enabling it programmatically.
• Verify your Node.js server sends valid SSDP NOTIFY or M-SEARCH responses that match the service type you’re scanning for.

内容的提问来源于stack exchange，提问作者Salem Masoud