sqmlu-reader.py

import time
import serial

# configure the serial connections (the parameters differs on the device you are connecting to)
ser = serial.Serial(
    port='/dev/ttyUSB0',
    baudrate=115200,
    parity=serial.PARITY_NONE,
    stopbits=serial.STOPBITS_ONE,
    bytesize=serial.EIGHTBITS
)


def send_cmd(ser, cmd):
    encoded = (cmd + '\n').encode()
    ser.write(encoded)
    time.sleep(1)
    out = ''
    while ser.inWaiting() > 0:
        out += ser.read(1).decode('utf-8')
    return out.strip()

def sqm_read_parse(txt: str) -> tuple:
    """ example input: 00.00m,0000557221Hz,0000000000c,0000000.000s, 037.0C
        example output: (00.0, 37.0) """
    entities = txt.strip().split(",")
    mag = float(entities[0][:-1]) # get rid of the m suffix
    # Ignore frequency
    temp = float(entities[4].strip()[:-1]) # get rid of the C suffix
    return (mag, temp)


ser.isOpen()

# Read device info request
#ix_response = send_cmd(ser, "ix")
#print(f"ix response: [{ix_response}]")

# Get the measurements
rx_response = send_cmd(ser, "rx")
ser.close()

sqm, temp = sqm_read_parse(rx_response)

print(f"# {rx_response}")
print(f"sqm temperature={temp},magnitude={sqm}")

# Get the calibration info
#cx_response = send_cmd(ser, "cx")
#print(f"cx response: [{cx_response}]")