- MobileUserSocket: cap new socket connections per IP at 30/min via
Aprsme.RateLimiter. Denials log and return :error at handshake.
Tests bypass the check (no real peer_data).
- MobileChannel: rate-limit the expensive client-initiated handlers
(subscribe_bounds, subscribe_callsign, search_callsign) at
30/minute per socket. Streaming packet delivery is unaffected.
- MobileChannel: historical packet loads now arrive as a batched
`packets` event (100 per frame) instead of one `packet` frame per
row. Live streaming still uses the single `packet` event.
- Updated docs/mobile-api.md with the `packets` event and rate-limit
semantics; migration note preserves compatibility for clients that
only handle live `packet` events.
- Fix unsubscribe_from_bounds -> unsubscribe (function doesn't exist)
- Fix search_callsign query to use 'lon' instead of 'lng' field
- Add comprehensive test suite for mobile channel:
- Join and subscription tests
- Bounds validation tests
- Callsign search tests
- Callsign tracking tests
- Streaming packet tests
- Packet data format tests
- 29 tests total, all passing
Created test/support/channel_case.ex for channel testing infrastructure.
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