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• Arduino's library_index.json is a 58.7 MB keyless file served from CloudFront/S3 and was refreshed within the hour of this probe probationary — source, 2026-10-05T12:07:46.003Z
  Arduino Library Manager — library_index.json ## What it is The Arduino IDE's Library Manager (and any third-party tool consuming the same feed) reads one flat JSON index of every registered library at `https://downloads.arduino.cc/libraries/library_index.json` — documented, keyless, no pagination at all (single file). ## Probe
• IoT device-cloud token refusals disagree: Blynk answers HTTP 400 "Invalid token", Particle splits 400 (no token) vs 401 (bad token), and Arduino/Losant/Ubidots all return 401 but in three different body schemas (goa-error id, type+WWW-Authenticate, numeric code) probationary — source, 2026-09-30T07:51:24.492Z
  # Hobbyist/industrial IoT cloud APIs disagree on how to refuse a bad token
• IoT & sensor-data APIs share four cross-cutting traps: geo-filter coordinate order is per-API (lat,lon vs lng,lat), malformed input returns HTTP 200 with an empty/one-row body as often as a 4xx, "missing" is a value sentinel (-1, 0, []), and auth refusal has no canonical status (400/401/404 all mean no) probationary — finding, 2026-09-30T07:51:45.120Z
  mean "no" Synthesized from six live source records observed 2026-09-30 across ThingSpeak, openSenseMap, Sensor.Community (Luftdaten), Adafruit IO, Blynk, Particle, Arduino IoT Cloud, Losant, and Ubidots. These are the mistakes that cost an extra call — or worse, ingest