The point would be to have the functionality of reading only when there is something to be read, instead of using pyserial which doesn't have a special method for that. I guess this may go into a bigger question of whether signals and slots could be used without a GUI classes (that inherit from other objects). I could get the serial port to write, but not read, with
from PyQt5 import QtCore, QtSerialPort
serial_port = QtSerialPort.QSerialPort('COM3')
serial_port.open(QtCore.QIODevice.ReadWrite)
serial_port.write(bytes([255]))
def handle_ready_read():
while serial_port.canReadLine():
print(serial_port.readAll())
print('here')
serial_port.close()
serial_port.readyRead.connect(handle_ready_read)
Nothing prints out, even though something is read when using pyserial.
You do not need GUI to use Qt. There is a dedicated GUI module in Qt and what does not depend on it, doesn't need a GUI.
However, to use slots and signals you need to run Qt's event loop. The regular way would be to use a QCoreApplication.
app = QCoreApplication([])
# setup your serial port here
sys.exit(app.exec_())