Hardware:

Board: ESP32
Core Installation version: framework-arduinoespressif32 3.10006.210326 (1.0.6)
IDE name: Platform.io
Flash Frequency: 40Mhz
PSRAM enabled: no
Upload Speed: 115200
Computer OS: Windows 10

Description:

I have worker task, which should sleep while no incoming data on uart and wake on data and process it.
I found that HardwareSerial::available() and HardwareSerial::read()
are non-blocking. So i have busyloop in task which is not good for CPU resource optimization.

Sketch:

#include <Arduino.h>
#include <HardwareSerial.h>

void *uart_task(void *arg)
{
	size_t read;
	for (;;) {
		wait_for_data(&Serial2); // <- How to do this????

		if (!Serial2.available()) // This is non-blocking.
			continue;

		read = Serial2.read(buff, sizeof(buff)); // Also non-blocking.
		process_data(buff, read);
	}
}