import serial
from time import sleep

ser = serial.Serial("COM9", 2000000)
ser.flushInput()
ser.flushOutput()

def serial_request(to_send):
    ser.flushInput()
    ser.flushOutput()
    while True:
        # ser.write(b'%b' % (to_send.encode()))
        ser.write(to_send.encode())
        print(to_send.encode())
        sleep(3)
        data = str(ser.readline(ser.inWaiting()).decode("utf-8"))
        print(data)
        if not data:
            continue
        else:
            return data

print(serial_request("get_dht"))