Serial ports unavailable

[dozy]

I'm in arduino cloud and when i open up serial ports it says that my serial ports are unavailable

[dozy]

[gcjr]

Serial.available() returns the # of chars available to read, not that the Serial port is ready to use

in the following, a read is attempted only after some chars are ready to be read. the serial monitor should be set to terminate with a newLine

void
loop (void)
{
    if (Serial.available ()) {
        char buf [90];
        int n = Serial.readBytesUntil ('\n', buf, sizeof(buf)-1);
        buf [n] = '\0';
        Serial.println (buf);
    }
}

void
setup (void)
{
    Serial.begin (9600);
}

[dozy]

thank you for your code it worked very well.