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perf: stop TLS retry storm, stream-parse JSON with a filter - #94
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MatixYo merged 1 commit intoSep 24, 2026
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The 200 ms connect timeout was too short for a TLS handshake, so every poll retried handshakes in a loop until the 10 s deadline. Use a 5000 ms connect timeout and a single attempt; a stalled connect is retried by the next poll instead of blocking the UI. Parse the response straight off the socket with a DeserializationOption Filter that keeps only the rendered fields, instead of buffering the whole body into a String and parsing that. Drop performGetWithPoll and readResponseBodyWithPoll in favor of one httpGetJson helper. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_017qjXYQiTkbgyVV7ZzvKzA3
MatixYo
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Sep 24, 2026
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Two problems in the ADS-B fetch path, both visible as UI stalls on an ESP32-C3.
TLS retry storm. The connect timeout was 200 ms — far too short for a TLS handshake to opendata.adsb.fi.
performGetWithPolltherefore almost always failed and retried in a tight loop until the 10 s request deadline, opening a fresh handshake each time. Every poll cycle burned seconds of CPU and heap on handshakes that were killed just before they could finish. Now: 5000 ms connect timeout and a single attempt (kConnectAttempts = 1). If a connect stalls, the poll cycle gives up and the next one retries 3 s later, rather than blocking the display. ThepollNetwork()call before the GET is kept.Whole response buffered as a String.
readResponseBodyWithPollaccumulated the entire JSON body into a heapString, which was then parsed into aJsonDocument— the payload existed twice in RAM, and a busy sector's response is large. Replaced withdeserializeJson(doc, http.getStream(), DeserializationOption::Filter(filter)): ArduinoJson parses straight off the socket and the filter keeps only the fields actually rendered (lat,lon, headings, speeds, altitudes,flight,hex,t,category). No intermediate String, and the document holds a small fraction of the response.Also: request timeout 10000 ms to 6000 ms, and the now-unused
performGetWithPoll/readResponseBodyWithPollare deleted. The two paths are consolidated into onehttpGetJsonhelper.User impact: the radar stops freezing for seconds at a time on flaky WiFi, and peak heap use during a fetch drops substantially — the difference between working and heap-exhausting when many aircraft are in range.
Tested: builds for env:supermini; ran on an ESP32-C3 Super Mini + GC9A01 (combined with other local changes).
🤖 Generated with Claude Code
https://claude.ai/code/session_017qjXYQiTkbgyVV7ZzvKzA3