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Why broadcast messages execute multiple times unexpectedly

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BD

BroadcastDebugger

Posted on January 23, 2024 • Intermediate

📡 Broadcast executing 31 times instead of once - very confused!

I’m working on a chess engine project and encountered a really strange bug. I have this simple setup:

    set [test variable v] to [0]
broadcast [test message v]

when I receive [test message v]
change [test variable v] by [1]

The weird thing is that when I click the broadcast script, instead of the variable being set to 1 as expected, it gets set to 31! 😵

I’m really confused because:

  • I’m not changing the variable anywhere else
  • I’m not broadcasting this message anywhere else
  • The same code works fine in a new project
  • It only happens in my complex chess project

Has anyone seen this before? What could cause a broadcast to execute 31 times when it should only execute once? 🤔

CD

CloneDetective_Pro

Replied 30 minutes later • ⭐ Best Answer

Aha! @BroadcastDebugger I can solve this mystery for you! 🕵️‍♂️ The issue is that your sprite has been cloned, and all clones receive broadcast messages too!

If your variable is being set to 31, that means you have 31 copies of your sprite (1 original + 30 clones) all responding to the same broadcast message.

🔍 Understanding Clone Communication

Here’s what’s happening in your project:

flowchart TD A[📡 Broadcast Message] --> B[Original Sprite Receives] A --> C[Clone 1 Receives] A --> D[Clone 2 Receives] A --> E[Clone 3 Receives] A --> F[... 30 more clones ...] B --> G[Changes Variable +1] C --> H[Changes Variable +1] D --> I[Changes Variable +1] E --> J[Changes Variable +1] F --> K[Changes Variable +1] G --> L[Final Result: +31] H --> L I --> L J --> L K --> L style A fill:#e1f5fe style L fill:#ffebee style G fill:#e8f5e8 style H fill:#e8f5e8 style I fill:#e8f5e8 style J fill:#e8f5e8 style K fill:#e8f5e8

🔧 Solution 1: Target Specific Sprites

If you only want the original sprite to respond, use this pattern:

    when I receive [test message v]
if <not <(clone?) = [true]>> then
change [test variable v] by [1]
end

🎯 Solution 2: Use Clone-Specific Messages

Create different messages for different purposes:

    // For original sprite only
broadcast [original sprite action v]

// For all clones only
broadcast [clone action v]

// For specific clone
broadcast (join [clone ] (clone id))

when I receive [original sprite action v]
if <not <(clone?) = [true]>> then
// Only original sprite executes this
change [test variable v] by [1]
end

when I receive [clone action v]
if <(clone?) = [true]> then
// Only clones execute this
// Clone-specific code here
end

🚀 Solution 3: Advanced Clone Management

For complex projects like chess engines, implement a clone registry:

    // Clone management system
when I start as a clone
add (clone id) to [active clones v]
set [my clone id v] to (length of [active clones v])

when I receive [targeted message v]
if <(target clone id) = (my clone id)> then
// Only the targeted clone responds
change [test variable v] by [1]
end

// Send targeted message
set [target clone id v] to [1]
broadcast [targeted message v]

🔍 Debugging Clone Issues

To debug clone-related broadcast issues:

  • Count your clones: Use a “clone counter” variable
  • Add clone IDs: Give each clone a unique identifier
  • Use conditional broadcasts: Check clone status before executing
  • Implement clone cleanup: Delete unused clones regularly
    // Debug helper - count active clones
when flag clicked
set [clone count v] to [0]

when I start as a clone
change [clone count v] by [1]

when I receive [count clones v]
say (join [Active clones: ] (clone count)) for [2] seconds

Mystery solved! Your chess engine has 30 clones, and they’re all responding to your broadcast. Use the solutions above to control which sprites respond to which messages! 🎯

BD

BroadcastDebugger

Replied 15 minutes later

@CloneDetective_Pro OMG, of course! 🤦‍♂️ I feel so silly now - my chess pieces are all clones and they’re all responding to the broadcast!

The clone detection solution worked perfectly. Thank you so much for the detailed explanation! 🙏

CM

CloneMaster_Alex

Replied 1 hour later

Great debugging session! 🎯 For chess engines specifically, here’s a pro tip for managing piece communication:

    // Chess piece communication system
define send to piece (piece type) (position) (message)
set [target piece v] to (join (piece type) (position))
broadcast (join [piece command ] (message))

when I receive [piece command move v]
if <(my piece id) = (target piece)> then
// Only the targeted piece moves
glide [1] secs to x: (new x) y: (new y)
end

This way you can control individual pieces without affecting all clones! 🏰♟️

VB

Vibelf_Community

Pinned Message • Moderator

🔧 Master Advanced Clone Management

Excellent debugging discussion! For those working on complex projects with multiple clones, our community can help you implement:

  • 🎯 Targeted messaging systems
  • 🔄 Clone lifecycle management
  • 📡 Advanced broadcast patterns
  • 🧩 Complex sprite coordination

📚 Related Clone Topics

Ready to build sophisticated multi-sprite systems? Get personalized guidance from our expert tutors in the Vibelf app!