完成py_plan.md

sim/config.py

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+"""
+Configuration system for LoRa route simulation.
+
+All parameters must be defined here - no hardcoded values allowed.
+"""
+
+# =============================================================================
+# Network Topology
+# =============================================================================
+NODE_COUNT = 12  # Number of nodes in the network
+AREA_SIZE = 800  # Deployment area size (meters)
+SINK_NODE_ID = 0  # Sink node ID (root of the routing tree)
+
+# =============================================================================
+# Timing Parameters
+# =============================================================================
+HELLO_PERIOD = 8.0  # HELLO packet broadcast period (seconds)
+DATA_PERIOD = 30.0  # Data packet generation period (seconds)
+SIM_TIME = 1000.0  # Total simulation time (seconds)
+
+# =============================================================================
+# Radio Parameters
+# =============================================================================
+TX_POWER = 14  # Transmit power (dBm)
+RSSI_THRESHOLD = -105  # Reception sensitivity threshold (dBm)
+NOISE_SIGMA = 3  # Gaussian noise standard deviation (dB)
+PATH_LOSS_EXPONENT = 2.7  # Path loss exponent (n)
+
+# =============================================================================
+# MAC Layer Parameters
+# =============================================================================
+ACK_TIMEOUT_FACTOR = 2.5  # ACK timeout = airtime × this factor
+MAX_RETRY = 3  # Maximum transmission retries
+BACKOFF_MIN = 0.0  # Minimum backoff time (seconds)
+BACKOFF_MAX = 2.0  # Maximum backoff time (seconds)
+
+# =============================================================================
+# LoRa Physical Parameters
+# =============================================================================
+SF = 9  # Spreading Factor (7-12)
+BW = 125000  # Bandwidth (Hz)
+CR = 5  # Coding Rate (5-8, represents 4/5 to 4/8)
+PREAMBLE = 8  # Preamble length (symbols)
+
+# =============================================================================
+# Routing Parameters
+# =============================================================================
+LINK_PENALTY_SCALE = 8.0  # Scale factor for link penalty calculation
+ROUTE_UPDATE_THRESHOLD = 1.0  # Cost threshold for route update
+
+# =============================================================================
+# Logging
+# =============================================================================
+LOG_LEVEL = "INFO"  # DEBUG, INFO, WARNING, ERROR
+LOG_FORMAT = "[{time:.1f}][NODE{nid:>3}][{event}] {message}"