#!/usr/bin/env python3
from time import sleep
from sys import exit
import minimalmodbus
import serial


print('---- Looking for device ----')
slave_address_list = range(200,256)
baud_list = [19200,115200]
CO2_addr = 9
total_devices = 0
for slave_address in slave_address_list:
    for baud in baud_list:
        print(f'Address {slave_address} baud {baud}:\t\t', end='')
        try:
            # modbus init
            instrument = minimalmodbus.Instrument('/dev/rs485', slave_address, close_port_after_each_call=True)  # port name, slave address (in decimal)
            instrument.serial.baudrate = baud
            instrument.serial.bytesize = 8
            instrument.serial.parity   = serial.PARITY_EVEN
            instrument.serial.stopbits = 1
            instrument.serial.timeout  = 0.05          # seconds
            instrument.mode = minimalmodbus.MODE_RTU   # rtu or ascii mode
            instrument.clear_buffers_before_each_transaction = True
            ##
            CO2 = instrument.read_register(CO2_addr, 1, functioncode=4) * 10
            print('DEVICE RESPONDED')
            total_devices += 1
        except minimalmodbus.NoResponseError:
            print(f'no response')
        sleep(0.1)
print(f'Found {total_devices} devices (tried {len(slave_address_list)} addresses)')
print('---- DONE ----')
exit(0)