write-up: IoT/Lets_All_Love_UART/README.md

IoT/Lets_All_Love_UART/README.md

@@ -1,17 +1,46 @@
-# Let's All Love UART — Solution
+# Let's All Love UART
 
-**Difficulty:** Easy | **Category:** IoT | **Flag:** `ESPILON{LAIN_TrUsT_U4RT}`
+| Field | Value |
+|-------|-------|
+| Category | IoT |
+| Difficulty | Easy |
+| Points | 500 |
+| Author | Eun0us |
+| CTF | Espilon 2026 |
 
-## Overview
+---
 
-The challenge emulates a split UART interface on a Lain router:
+## Description
 
-- **TX (port 1111)**: Read only — device output
-- **RX (port 2222)**: Write only — send commands
+This challenge emulates a UART interface on a Lain router.
+Open both connections, interact as if it was real hardware.
 
-## Steps
+- **TX**: Read only
+- **RX**: Write only
 
-1. Open two terminals:
+**Let's All Love Lain!**
+
+---
+
+## TL;DR
+
+Open the TX and RX ports simultaneously. Send `flag` on the RX (write) port.
+The flag is immediately printed on the TX (read) port.
+
+---
+
+## Tools
+
+| Tool | Purpose |
+|------|---------|
+| `nc` | Split UART connection |
+| Python 3 | Automated solver script |
+
+---
+
+## Solution
+
+### Step 1 — Open both channels
 
 ```bash
 # Terminal 1 — read device output
@@ -21,19 +50,27 @@ nc <host> 1111
 nc <host> 2222
 ```
 
-1. On the RX terminal, send the `flag` command:
+> 📸 `[screenshot: two terminal windows open, TX showing the device banner]`
+
+### Step 2 — Request the flag
+
+In Terminal 2 (RX):
 
 ```text
 flag
 ```
 
-1. The flag prints on the TX terminal:
+### Step 3 — Read the flag
 
-```text
+In Terminal 1 (TX):
+
+```
 ESPILON{LAIN_TrUsT_U4RT}
 ```
 
-## Solver Script
+> 📸 `[screenshot: TX terminal printing the flag immediately after the flag command is sent]`
+
+### Automated solver
 
 ```python
 #!/usr/bin/env python3
@@ -64,10 +101,8 @@ with socket.create_connection((HOST, RX_PORT)) as s:
 tx_thread.join()
 ```
 
+---
+
 ## Flag
 
 `ESPILON{LAIN_TrUsT_U4RT}`
-
-## Author
-
-Eun0us