Thank you for your explanation. It made me rethink my assumptions (I was used to AVR controllers), and I believe I've figured it out. The ring buffer is of course used. But, while a transmission is ongoing, and with default settings, the first non-zero result of available() will be 120 - the first t...

Hi, I'm receiving a 262 282 byte data packet (sent in one piece) on an ESP32 (2400 baud, 8N1) like so: void setup() { Serial.begin(115200); Serial2.setRxBufferSize(512); Serial2.begin(2400); } void loop() { uint8_t buffer[512]; size_t bytesRead; while(!Serial2.available()); bytesRead = Serial2.read(...