Problem Statement:

In this lab, you are tasked with modifying an NS$-3$ simulation code to achieve the following objectives:

$1.$ Track the total number of packets received correctly and the total number of packets received with errors.

$2.$ Extend the solution to gather packet statistics for each individual node, which could enhance data analysis by allowing per$-$node performance monitoring.

$3.$ Explore additional use cases for callbacks, such as:

$-$ Logging real$-$time performance metrics.

$-$ Identifying network bottlenecks.

$-$ Triggering specific events based on conditions during the simulation.

After implementing the modifications, reflect on how using callbacks impacted your data collection and analysis, comparing this approach to other tracing mechanisms in NS$-3,$ like pcap and logging$.$

$-$ Submit your code.

$-$ Write your observations, including insights on the usage of callbacks, and how they can improve the flexibility and effectiveness of data collection in network simulations.