EC200U OTA Download to ESP32 Losing Data

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1

Hi,

I’m using an ESP32 with EC200U to download and flash firmware via OTA, while also saving a copy to SD. The download sometimes loses data in the middle, causing OTA failures.

Current approach:

  • 256-byte buffer with EC200U.readBytes().
  • Writing each chunk to OTA and SD immediately.
  • 15s inactivity timeout.

Issue: Some bytes in the firmware are missing despite checking available() and waiting for “CONNECT”. Suspect buffer overflow or blocking read.

Question: What’s the best practice to reliably read large firmware files from EC200U without missing data?

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