Contact person: Business Client

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Location: Puttur, India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I need to move a single 3 MB binary file from an ESP32 to the internet through a SIM-based 4G module, landing it on my Nginx web server with an HTTP POST request. The modem’s buffer tops out at roughly 1400 bytes, so the core challenge is breaking the payload into compliant pieces, re-assembling it server-side, and confirming data integrity.

What matters to me is a clean, repeatable solution that copes with transient network drops and keeps RAM use on the ESP32 reasonable. C/C++ (Arduino / IDF) is fine; I can flash and test any firmware you provide. If chunked transfer encoding or multipart strategies are a better fit than raw slicing, I’m open to that—so long as the final file appears intact under Nginx.

Deliverables
• Well-commented ESP32 source demonstrating the upload strategy
• Any helper script or Nginx configuration needed to accept and reassemble the chunks
• Brief step-by-step notes so I can reproduce the build and test on my hardware

I already have the hardware on my bench and can exercise your code immediately, so quick feedback loops are guaranteed." (client-provided description)