Add TX shortcuts script for easy transmission from shell

[manuignatius]

TX Shortcuts Script

Adds a convenient Groovy script (tx.groovy) that provides short command aliases for sending physical layer frames.

Usage

1. Upload tx.groovy to the scripts folder
2. Load in shell with: tx
3. Use short commands:
   • c() - Broadcast CONTROL frame
   • c(4) - Send CONTROL frame to node 4
   • c(4, [1,2,3]) - Send CONTROL frame to node 4 with data
   • d() - Broadcast DATA frame
   • d(4) - Send DATA frame to node 4
   • d(4, [1,2,3]) - Send DATA frame to node 4 with data

[Copilot]

Pull Request Overview

This PR adds a Groovy script that provides convenient shortcuts for transmitting physical layer frames in the UNet framework. The script offers simple command aliases for sending CONTROL and DATA frames with various parameter combinations.

• Adds tx.groovy script with short command functions c() and d() for frame transmission
• Supports broadcast, targeted, and data-carrying frame transmission modes
• Includes user-friendly help output when the script is loaded

[notthetup]

One thing to note, maybe add a comment, that this will break if some other script assigns a variable named c or d.