Add periodic WebSocket heartbeat for dead connection detection #1017
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Implements 30-second heartbeat pings to Nostr relay WebSocket connections to detect and handle dead connections that may not trigger disconnect events. Changes: - Add heartbeatTimers dictionary and heartbeatInterval constant - Add startHeartbeat/stopHeartbeat/sendHeartbeatPing functions - Start heartbeat when connection is established - Stop heartbeat on disconnect or connection failure - Handle heartbeat failures by triggering reconnection with backoff This improves connection reliability by proactively detecting stale connections that appear connected but are no longer responsive. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
Changes
heartbeatTimersdictionary andheartbeatIntervalconstantstartHeartbeat/stopHeartbeat/sendHeartbeatPingfunctionsTest plan
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