I am learning this esp8266 now, and i saw this code was used in a tutorial for turning on and off a led using wifi, but can someone explain to me how this works? String req = client.readStringUntil('\r'); // what does client.readStringUntil do? Serial.println(req); client.flush(); // what does cl…

Help to understand a bit of a code! (ESP8266)

PieterP April 28, 2018, 2:42pm 4

It's in the link I posted. indexOf returns -1 if the substring is not found.

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