# Device Management System Update - Version 2.4

## Overview
This update adds remote command execution capabilities between the Server_Monitorizare and the prezenta devices, along with improved error handling for network connectivity issues.

## New Features

### 1. Robust Network Configuration (app.py)
- **File-based fallback system**: Device hostname and IP are saved to `./data/device_info.txt`
- **Automatic error recovery**: When socket.gaierror occurs, the system loads previously saved values
- **No external dependencies**: Uses only built-in Python modules
- **Graceful degradation**: App continues to run even with network issues

### 2. Remote Command Execution System

#### Server Side (server.py)
New endpoints added:
- `/device_management` - Web interface for managing devices
- `/execute_command` - Execute command on single device
- `/execute_command_bulk` - Execute command on multiple devices
- `/device_status/<device_ip>` - Get device status information

#### Device Side (app.py)
New Flask server running on port 5000:
- `/execute_command` - Receive and execute system commands
- `/status` - Provide device status information

### 3. Security Features
- **Whitelisted commands only**: Prevents execution of arbitrary commands
- **Command logging**: All command execution attempts are logged
- **Timeout protection**: Commands have 5-minute timeout limit
- **Error handling**: Comprehensive error reporting

### 4. Web Interface Improvements
- **Device Management Dashboard**: Complete interface for managing all devices
- **Real-time status checking**: Check if devices are online/offline
- **Bulk operations**: Execute commands on multiple devices simultaneously
- **Search functionality**: Filter devices by hostname or IP
- **Command selection**: Dropdown menus for common system commands

## Allowed Commands
For security, only these commands can be executed remotely:
- `sudo apt update` - Update package lists
- `sudo apt upgrade -y` - Upgrade packages
- `sudo apt autoremove -y` - Remove unused packages
- `sudo apt autoclean` - Clean package cache
- `sudo reboot` - Reboot device
- `sudo shutdown -h now` - Shutdown device
- `df -h` - Check disk space
- `free -m` - Check memory usage
- `uptime` - Check system uptime
- `systemctl status` - Check system services
- `sudo systemctl restart networking` - Restart network services
- `sudo systemctl restart ssh` - Restart SSH service

## File Structure Changes

### New Files:
- `Server_Monitorizare/templates/device_management.html` - Device management interface
- `prezenta/data/device_info.txt` - Device configuration cache (auto-created)

### Modified Files:
- `prezenta/app.py` - Added command execution server and network error handling
- `Server_Monitorizare/server.py` - Added command execution endpoints
- `Server_Monitorizare/templates/dashboard.html` - Added device management link

## Usage Instructions

### Starting the Services
1. **Start the monitoring server** (port 80):
   ```bash
   cd Server_Monitorizare
   sudo python3 server.py
   ```

2. **Start the device app** (ports 5000 for commands + normal operation):
   ```bash
   cd prezenta
   python3 app.py
   ```

### Using the Web Interface
1. Navigate to `http://server-ip:80/dashboard`
2. Click "Device Management" to access the new interface
3. Use the dropdown menus to select commands
4. Execute on single devices or use bulk operations

## Benefits
1. **Centralized device management** - Control all devices from one interface
2. **Automated maintenance** - Schedule updates and maintenance tasks
3. **Real-time monitoring** - Check device status and performance
4. **Improved reliability** - Network error handling prevents app crashes
5. **Security** - Controlled command execution with comprehensive logging