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Jesse Hills
17589d10b4
esp_now_send built the outbound frame into a function-static buffer before request() took g_req_mutex, so two tasks calling the public esp_now_send symbol could overwrite each other's frame. It also meant every transmit copied the body twice: once into that buffer, then again into request()'s own buffer. request() now takes an optional tail chunk that it writes straight after the payload, under the mutex. esp_now_send builds only the 9-byte header on the stack and hands the caller's frame over as the tail. That removes the race, drops a full-frame copy per transmit, and frees the 1479-byte static buffer. The wire format is unchanged: the same header bytes followed by the same frame bytes, with the same payload_len.
