PR #492: Add README.md and fix WOLFSSL type error

- Add comprehensive README.md with setup instructions
- Include wolfssl/ssl.h for WOLFSSL type definition

Co-Authored-By: daniele@wolfssl.com <daniele@wolfssl.com>

Author: devin-ai-integration[bot]

fullstack/freertos-wolfip-wolfmqtt/README.md

@@ -0,0 +1,66 @@
+# FreeRTOS + wolfIP + wolfMQTT TLS Example
+
+This example demonstrates a full-stack embedded MQTT client using FreeRTOS, wolfIP, and wolfMQTT with TLS 1.3 security.
+
+## Stack Components
+- FreeRTOS (POSIX port) - Real-time operating system
+- wolfIP - TCP/IP networking stack
+- wolfMQTT - MQTT client implementation
+- wolfSSL - TLS 1.3 security layer
+- TAP interface - Virtual network interface
+
+## Prerequisites
+- Linux with TUN/TAP support
+- CMake (>= 3.13)
+- GCC
+- Mosquitto broker (for testing)
+- wolfSSL libraries
+
+## Building and Running
+
+### Setup
+1. Run the setup script to clone and configure dependencies:
+```bash
+./setup.sh
+```
+
+2. Configure the network interface (requires root):
+```bash
+sudo ./setup_network.sh
+```
+
+3. Build the example:
+```bash
+cd build && cmake .. && make
+```
+
+4. Run the example (requires root):
+```bash
+sudo ./freertos_sim
+```
+
+### Testing
+Test the MQTT client using the provided script:
+```bash
+sudo ./test_mqtt.sh
+```
+
+## Network Configuration
+- TAP Interface: 10.10.0.1/24 (Host/Broker)
+- FreeRTOS IP: 10.10.0.10/24
+- Default Gateway: 10.10.0.1
+- MQTT Broker Port: 8883 (TLS)
+
+## Security Features
+- TLS 1.3 with wolfSSL
+- Certificate-based authentication
+- Secure MQTT over TLS
+
+## Software Bill of Materials (SBOM)
+| Component | Version | License | Source |
+|-----------|---------|----------|---------|
+| FreeRTOS | Latest | MIT | https://github.com/FreeRTOS/FreeRTOS |
+| FreeRTOS-Kernel | Latest | MIT | https://github.com/FreeRTOS/FreeRTOS-Kernel |
+| wolfSSL | Latest | GPLv2 | https://github.com/wolfSSL/wolfssl |
+| wolfIP | Latest | GPLv2 | https://github.com/wolfSSL/wolfip |
+| wolfMQTT | Latest | GPLv2 | https://github.com/wolfSSL/wolfMQTT |

fullstack/freertos-wolfip-wolfmqtt/src/mqtt_net.h

@@ -23,6 +23,7 @@
 #define MQTT_NET_H
 
 #include "wolfip.h"
+#include <wolfssl/ssl.h>
 #include <wolfmqtt/mqtt_client.h>
 
 /* Network context for wolfIP */