#!/usr/bin/python
# -*- coding: utf-8 -*-
import serial, time
import meterbus
import requests

address = 0
port = 'COM8'
wakeup = "\x55" * 132

# 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())

ser.close()