multicast/broadcast support

README.md

@@ -74,16 +74,27 @@ The example demonstrates simple but practical commands like enabling/disabling o
 2. Tap the **"New Package"** button
 3. Enter:
    - Package name (for identification)
-   - IP address (destination, e.g., 127.0.0.1 for localhost)
+   - **Broadcast Mode** (toggle on to broadcast to all devices on network)
+   - **IP addresses** (add one or more target IPs, not required for broadcast)
    - Data (the content to send)
 4. Tap **"Save"**
 
+#### Broadcast Mode
+Enable broadcast mode to send UDP packets to all devices on your local network. This is useful for controlling multiple Unity instances simultaneously without specifying individual IP addresses.
+
+#### Multiple IP Addresses
+Add multiple IP addresses to send the same packet to specific targets. The app will show you how many addresses received the packet successfully.
+
 ### Sending UDP Packages
 
 1. Navigate to a project
 2. Find the package you want to send
 3. Tap the **"Send"** button
-4. The package will be sent to the configured IP address and port
+4. The package will be sent to:
+   - All devices on the network (if broadcast mode is enabled)
+   - Multiple specific IP addresses (if multiple IPs are configured)
+   - A single IP address (standard mode)
+5. Check the feedback message to confirm successful delivery
 
 ### Managing Projects and Packages
 
@@ -103,6 +114,14 @@ The example demonstrates simple but practical commands like enabling/disabling o
 
 **Note:** For full UDP functionality, run the app on desktop (Windows/macOS/Linux) or mobile platforms. Web browsers do not support raw UDP sockets due to security restrictions.
 
+### Broadcast Mode Requirements
+
+To use broadcast mode effectively:
+- All target devices must be on the same local network (subnet)
+- Your firewall must allow outbound UDP broadcast traffic
+- Receiving applications must be listening on the specified port
+- Some routers may block broadcast packets - check your router settings if needed
+
 ## Architecture
 
 The app follows a clean architecture pattern with: