## 1\. System Assumptions

### SA-01: Deployment Environment

*   The Sensor Hub operates in an indoor poultry farm environment.
    
*   Environmental conditions may include high humidity, dust, and ammonia presence.
    

### SA-02: Power Availability

*   The Sensor Hub is assumed to have continuous power.
    
*   Short power interruptions may occur; system shall recover gracefully.
    

### SA-03: Network Connectivity

*   Wireless connectivity to the Main Hub may be intermittent.
    
*   The Sensor Hub shall operate autonomously when disconnected.
    

### SA-04: Trusted Provisioning

*   Devices are assumed to be provisioned securely during manufacturing or installation.
    
*   Cryptographic keys are assumed to be injected via a secure process.
    

### SA-05: Time Synchronization

*   System time is assumed to be synchronized periodically by the Main Hub.
    
*   Temporary time drift is acceptable.
    

## 2\. System Limitations

### SL-01: Local Processing Limits

*   The Sensor Hub performs lightweight preprocessing only.
    
*   Complex analytics and AI models are out of scope.
    

### SL-02: User Interface Constraints

*   The OLED display is intended for monitoring and diagnostics only.
    
*   It is not a full configuration or management interface.
    

### SL-03: Physical Security

*   The Sensor Hub does not include physical tamper detection.
    
*   Physical access is assumed to be restricted.
    

### SL-04: Storage Constraints

*   SD card storage capacity is finite.
    
*   Data retention policies may result in data overwrite.
    

### SL-05: Safety Classification

*   The system is not classified as a safety-critical life-support system.
    
*   Failures may impact farm performance but not human safety directly.
    

## 3\. External Dependencies

*   ESP32-S3 hardware platform
    
*   ESP-IDF framework
    
*   Supported sensors and communication modules
    
*   Main Hub availability for OTA and configuration updates