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system_design/features/System Assumptions & Limitations.md

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+## 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