285 lines
7.5 KiB
Python
285 lines
7.5 KiB
Python
#!/usr/bin/python2 -u
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# coding=utf-8
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import os
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import re
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import struct
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import serial
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import logging
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from sys import argv, exit
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from datetime import datetime
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from pymodbus.pdu import ModbusRequest, ModbusResponse, ExceptionResponse
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from pymodbus.other_message import ReportSlaveIdRequest
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from pymodbus.exceptions import ModbusException
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from pymodbus.pdu import ExceptionResponse
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from pymodbus.factory import ClientDecoder
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from pymodbus.client import ModbusSerialClient as Modbus
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logging.basicConfig(level=logging.INFO)
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# trick the pycharm type-checker into thinking Callable is in scope, not used at runtime
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# noinspection PyUnreachableCode
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if False:
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from typing import List, Optional, NoReturn
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RESET_REGISTER = 0x2087
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FIRMWARE_VERSION_REGISTER = 1054
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SERIAL_STARTER_DIR = '/opt/victronenergy/serial-starter/'
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INSTALLATION_NAME_FILE = '/data/innovenergy/openvpn/installation-name'
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OUTPUT_DIR = '/data/innovenergy'
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class ReadLogRequest(ModbusRequest):
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function_code = 0x42
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_rtu_frame_size = 5 # not used
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def __init__(self, address = None, **kwargs):
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ModbusRequest.__init__(self, **kwargs)
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self.sub_function = 0 if address is None else 1
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self.address = address
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# FUGLY as hell, but necessary bcs PyModbus cannot deal
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# with responses that have lengths depending on the sub_function.
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# it goes without saying that this isn't thread-safe
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ReadLogResponse._rtu_frame_size = 9 if self.sub_function == 0 else 9+128
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def encode(self):
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if self.sub_function == 0:
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return struct.pack('>B', self.sub_function)
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else:
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return struct.pack('>BI', self.sub_function, self.address)
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def decode(self, data):
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self.sub_function = struct.unpack('>B', data)
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def execute(self, context):
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print("EXECUTE1")
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def get_response_pdu_size(self):
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return ReadLogResponse._rtu_frame_size - 3
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def __str__(self):
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return "ReadLogAddressRequest"
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class ReadLogResponse(ModbusResponse):
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function_code = 0x42
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_rtu_frame_size = 9 # the WHOLE frame incl crc
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def __init__(self, sub_function=0, address=b'\x00', data=None, **kwargs):
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ModbusResponse.__init__(self, **kwargs)
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self.sub_function = sub_function
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self.address = address
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self.data = data
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def encode(self):
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pass
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def decode(self, data):
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self.address, self.address = struct.unpack_from(">BI", data)
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self.data = data[5:]
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def __str__(self):
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arguments = (self.function_code, self.address)
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return "ReadLogAddressResponse(%s, %s)" % arguments
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# unfortunately we have to monkey-patch this global table because
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# the current (victron) version of PyModbus does not have a
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# way to "register" new function-codes yet
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ClientDecoder.function_table.append(ReadLogResponse)
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class LockTTY(object):
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def __init__(self, tty):
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# type: (str) -> None
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self.tty = tty
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def __enter__(self):
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os.system(SERIAL_STARTER_DIR + 'stop-tty.sh ' + self.tty)
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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os.system(SERIAL_STARTER_DIR + 'start-tty.sh ' + self.tty)
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def wrap_try_except(error_msg):
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def decorate(f):
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def applicator(*args, **kwargs):
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try:
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return f(*args, **kwargs)
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except:
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print(error_msg)
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exit(1)
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return applicator
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return decorate
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def init_modbus(tty):
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# type: (str) -> Modbus
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return Modbus(
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port='/dev/' + tty,
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method='rtu',
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baudrate=115200,
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stopbits=1,
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bytesize=8,
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timeout=0.5, # seconds
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parity=serial.PARITY_ODD)
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@wrap_try_except("Failed to download BMS log!")
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def download_log(modbus, node_id, battery_id):
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# type: (Modbus, int, str) -> NoReturn
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# Get address of latest log entry
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# request = ReadLogRequest(unit=slave_id)
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print ('downloading BMS log from node ' + str(node_id) + ' ...')
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progress = -1
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log_file = battery_id + "-node" + str(node_id) + "-" + datetime.now().strftime('%d-%m-%Y') + ".bin"
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print(log_file)
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with open(log_file, 'w') as f:
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eof = 0x200000
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record = 0x40
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for address in range(0, eof, 2*record):
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percent = int(100*address/eof)
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if percent != progress:
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progress = percent
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print('\r{}% '.format(progress),end='')
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request = ReadLogRequest(address, slave=node_id)
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result = modbus.execute(request) # type: ReadLogResponse
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address1 = "{:06X}".format(address)
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address2 = "{:06X}".format(address+record)
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data1 = result.data[:record]
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data2 = result.data[record:]
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line1 = address1 + ":" + ''.join('{:02X}'.format(byte) for byte in data1)
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line2 = address2 + ":" + ''.join('{:02X}'.format(byte) for byte in data2)
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lines = line1 + "\n" + line2 + "\n"
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f.write(lines)
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print("\r100%")
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print("done")
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print("wrote log to " + log_file)
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return True
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@wrap_try_except("Failed to contact battery!")
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def identify_battery(modbus, node_id):
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# type: (Modbus, int) -> str
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target = 'battery #' + str(node_id)
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print('contacting ' + target + ' ...')
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request = ReportSlaveIdRequest(slave=node_id)
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response = modbus.execute(request)
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index_of_ff = response.identifier.find(b'\xff')
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sid_response = response.identifier[index_of_ff + 1:].decode('utf-8').split(' ')
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response = modbus.read_input_registers(address=FIRMWARE_VERSION_REGISTER, count=1, slave=node_id)
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fw = '{0:0>4X}'.format(response.registers[0])
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print("log string is",sid_response[0]+"-"+sid_response[1]+"-"+fw)
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#return re.sub(" +", "-", sid + " " + fw)
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return sid_response[0]+"-"+sid_response[1]+"-"+fw
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def is_int(value):
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# type: (str) -> bool
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try:
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_ = int(value)
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return True
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except ValueError:
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return False
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def print_usage():
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print ('Usage: ' + __file__ + ' <slave id> <serial device>')
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print ('Example: ' + __file__ + ' 2 ttyUSB0')
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print ('')
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print ('You can omit the "ttyUSB" prefix of the serial device:')
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print (' ' + __file__ + ' 2 0')
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print ('')
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print ('You can omit the serial device entirely when the "com.victronenergy.battery.<serial device>" service is running:')
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print (' ' + __file__ + ' 2')
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print ('')
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def get_tty_from_battery_service_name():
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# type: () -> Optional[str]
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import dbus
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bus = dbus.SystemBus()
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tty = (
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name.split('.')[-1]
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for name in bus.list_names()
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if name.startswith('com.victronenergy.battery.')
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)
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return next(tty, None)
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def parse_tty(tty):
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# type: (Optional[str]) -> str
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if tty is None:
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return get_tty_from_battery_service_name()
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if is_int(tty):
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return 'ttyUSB' + argv[1]
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else:
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return tty
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def parse_cmdline_args(argv):
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# type: (List[str]) -> (str, int)
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slave_id = element_at_or_none(argv, 0)
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tty = parse_tty(element_at_or_none(argv, 1))
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if slave_id is None or tty is None:
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print_usage()
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exit(2)
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print("tty=",tty)
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print("slave id= ",slave_id)
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return tty, int(slave_id)
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def element_at_or_none(lst, index):
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return next(iter(lst[index:]), None)
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def main(argv):
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# type: (List[str]) -> ()
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tty, node_id = parse_cmdline_args(argv)
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with init_modbus(tty) as modbus:
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battery_id = identify_battery(modbus, node_id)
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download_log(modbus, node_id, battery_id)
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exit(0)
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main(argv[1:])
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