[ARCH-D-2.6] Standardize MTU Handling Across Protocols

[umwelt]

Phase: 2 - P1-High
Category: Protocol Standardization
Files: All protocol files

Description

Centralize MTU constants and fragmentation logic

Current Problem

Hardcoded values: BLE_MTU=247, LORA_MAX=242, BLE_CHUNK=100, WIFI_CHUNK=1400

Key Tasks

• Create lib-network/src/mtu.rs with centralized constants
• Create lib-network/src/fragmentation.rs
• Implement fragment_message(payload, mtu)
• Implement reassemble_message(fragments)
• Delete hardcoded chunk sizes

Acceptance Criteria

• MTU values centralized
• Fragmentation logic unified

References

See ARCHITECTURAL_FIXES_IMPLEMENTATION_PLAN.md Ticket 2.6