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For heinous reasons that I won't get into, my team recently finished implementing YModem-over-BLE for our embedded project.

same team as https://news.ycombinator.com/item?id=31572391 ? or is this more common than i imagine

Why not CoAP?

Why would anyone think someone would implement YMODEM over BLE if they could use anything else? It's one of the crappiest things ever.