#!/usr/bin/python
# -*- coding: utf-8 -*-
import serial, time
import meterbus
address = 0
port = '/dev/serial/by-path/pci-0000:01:1b.0-usb-0:2:1.0-port0'
wakeup = "\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55\x55"
# start communication with 8N1, DTR enabled
ser =  serial.Serial(port, 2400, 8, 'N', 1, 0.5)
ser.dsrdtr=True
# send wake up sequence
ser.write(wakeup)
time.sleep(0.130)
ser.read()
response = ser.readline()
# switch to 8E1
ser.parity = serial.PARITY_EVEN
# SND_NKE to reset the communication
meterbus.send_ping_frame(ser, address)
frame = meterbus.load(meterbus.recv_frame(ser, 1))
assert isinstance(frame, meterbus.TelegramACK)
# request data from meter
meterbus.send_request_frame(ser, address)
frame = meterbus.load(meterbus.recv_frame(ser, meterbus.FRAME_DATA_LENGTH))
assert isinstance(frame, meterbus.TelegramLong)
# print data, todo: save it to file
print(frame.to_JSON())