Get the ph and orp value from an aquacointelpro 1. It prints the data as json to stdout

aquacointelpro.py

#!/usr/bin/env python
'''
This scripts needs the `pyserial` python package installed to run (`pip install pyserial`).

Usage:
>>> Aqua().get_ph_orp()
{'ph': 6.82, 'orp': 116.0}
'''

import serial
import json


class Aqua:
    def __init__(self):
        self.conf = dict(
            port='/dev/ttyUSB0',
            baudrate=9600,
            timeout=5,
            parity=serial.PARITY_NONE,
            stopbits=serial.STOPBITS_ONE,
            bytesize=serial.EIGHTBITS)
        self.commands = dict(list='l', status='c', datalog='d')
        for name, command in self.commands.items():
            setattr(self, name, lambda command=command: self.commander(command))

    def commander(self, command):
        if not isinstance(command, bytes):
            command = command.encode('ascii')
        if not command.endswith(b'\r'):
            command += b'\r'
        with serial.Serial(**self.conf) as ser:
            ser.write(command)
            out = ser.read_until(b'AquaController> ')
        return out

    def get_ph_orp(self):
        data = self.status()
        out = data.split(b'\r\n')
        i = out.index(b' pH  ORP ')
        ph, orp = out[i + 1].split()
        return dict(ph=float(ph), orp=float(orp))


def main():
    print(json.dumps(Aqua().get_ph_orp()))


if __name__ == '__main__':
    main()