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By Electroguard
#53558 As Mike touched on in his previous post, C++ on the Arduino (which ESP_Basic is derived from) interprets the ascii NULL character as signifying the end of serial transmission.

So it may be worth standing back and re-evaluating what you're trying to do, cos there's usually more than one way of skinning the cat, and the trick is often just to find the cleanest and quickest way of doing things.
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By rey
#54136 I found how to do. I can receive the characters one by one with Serial.read.chr () but now I have another problem, it is very slow. To receive 48 bytes the delay is 38 seconds. I have to receive 500 bytes.
Is possible to improve this delay?