QSerialPort write more than one time, only the first writing can be response

[Samyang]

when click button, then write at to mobile, can get response "ok"

void MainWindow::on_show_clicked()
{
inputdata="at\r\n";
WriteData();
ui->Output->append(str);

}
but if click button, then write more than one string to mobile, only can get response "ok" for first "at

void MainWindow::on_show_clicked()
{
inputdata="at\r\n";
WriteData();
millisleep(50);
str =inputdata;
ui->Output->append(str);
inputdata="at+cops?\r\n";
WriteData();
millisleep(50);
str =inputdata;
ui->Output->append(str);
inputdata="at\r\n";
WriteData();
millisleep(50);
str =inputdata;
ui->Output->append(str);
}

so check the debug info, the cmd "at\r\n", "at+cops?\r\n","at\r\n" should be sent to mobile, but only first "at" can get response "ok", why?

[aha_1980]

@Samyang dont use sleep in event driven programs. use QTimer instead, otherwise signals&slots are not working.

have a look at Qts Terminal example, e.g.

[Samyang]

ok, thank, i will check.