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# SnmpKit v0.3.3 Release Notes

Release Date: 2024-12-19
Version: 0.3.3
Git Tag: v0.3.3

## 🐛 Bug Fixes

### Livebook Variable Scope Fix

This patch release fixes a critical issue in the interactive Livebook tour where variable scope was not properly managed across cells.

#### Issue Fixed

- Variable undefined error: `cable_modem_target` and `router_target` variables were not accessible in subsequent cells
- Cell execution failures: Users experienced runtime errors when running cells sequentially
- Poor user experience: Broken examples interrupted the learning flow

#### Solution Implemented

- Explicit variable definitions: Added target definitions at the start of each relevant cell
- Consistent variable names: Ensured `cable_modem_target = "127.0.0.1:1161"` and `router_target = "127.0.0.1:1162"` are available
- Cell independence: Each cell now works independently without relying on previous cell state
- Improved reliability: All code examples now execute successfully in any order

#### Files Modified

- `livebooks/snmpkit_tour.livemd` - Fixed variable scope across all cells

## 🔧 Technical Details

### Variable Scope Pattern

Each cell that uses device targets now includes:

    # Set targets for this cell
    cable_modem_target = "127.0.0.1:1161"
    router_target = "127.0.0.1:1162"

This ensures:

- ✅ Reliability - Cells execute successfully regardless of execution order
- ✅ Clarity - Variables are explicitly defined where used
- ✅ Maintainability - Easy to understand and modify
- ✅ User Experience - No unexpected variable errors

### Quality Assurance

- ✅ All cells tested individually
- ✅ Sequential execution verified
- ✅ Variable definitions consistent
- ✅ No breaking changes to functionality

## 🚀 Upgrade Instructions

    # Update your dependency
    {:snmpkit, "~> 0.3.3"}

Migration: No code changes required for library usage. This only affects the Livebook tour experience.

## 📊 Impact

### Before (v0.3.2)

- ❌ Variable scope errors in Livebook
- ❌ Cells failed when run out of order
- ❌ Poor learning experience
- ❌ Runtime errors interrupted tutorial flow

### After (v0.3.3)

- ✅ All cells execute independently
- ✅ Clear variable definitions in each cell
- ✅ Smooth learning experience
- ✅ Reliable tutorial execution

## 🎯 What's Next

This patch ensures the Livebook tour provides a seamless educational experience. Future releases will focus on:

- Additional device simulation examples
- Enhanced MIB compilation tutorials
- Performance optimization guides
- Integration examples with monitoring platforms

Previous Release: v0.3.2 - Self-Contained Livebook Tour

Critical patch for optimal Livebook experience!

For questions or support, please visit the GitHub repository.

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