Packet Filter V2

[gjelsoe]

Packet Filter Engine

Adds a flexible rule-based packet filter engine to the repeater firmware.

Rules can match on route type, payload type, hop count, path hash size, last-hop repeater, channel hash, SNR and RSSI. Each rule supports an optional AND condition for combined matching. A configurable default policy (allow/drop) applies when no rule matches.

Rules are added disabled by default and must be explicitly enabled. All rules survive reboot via SPIFFS/LittleFS persistence.

New files

• FilterRule.h — rule struct, enums and constants
• FilterParser.h/.cpp — command parser
• ChannelFilter.h/.cpp — rule storage, evaluation, persistence and CLI dispatch

Changes to existing files

• MyMesh.h — added ChannelFilter _filter member and include
• MyMesh.cpp — added _filter.load() in begin(), filter evaluation in filterRecvFloodPacket(), and filter command routing in handleCommand()

CLI

Commands are available over the remote CLI via the filter prefix. See FILTER.md for full command reference and examples.

Testing

A standalone test suite is included in filter_test_suite/. See filter_test_suite/README.md for build instructions.