sumup-zvt/reader_cmd_utils.py at master · cassa-pos/sumup-zvt · GitHub

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import dataclasses

from ber_tlv.tlv import Tlv

from reader_connection import ReaderConnection


@dataclasses.dataclass
class DeviceInfo:
    cmd_return: bytes
    base_firmware_version: str
    base_firmware_version_int: int
    battery_state: int
    display_text_version: bytes
    emv_cfg: bytes
    emvl1_kernel_version: str
    emvl2_kernel_version: str
    max_payload_size: str
    part_number: bytes
    svpp_software_version: str
    svpp_software_version_int: int
    terminal_serial_number: str


async def get_device_info(conn: ReaderConnection) -> DeviceInfo:
    response = await conn.exchange_command(b"\x01\x01\xC1\xC2\xC3\xC4\xC5\xC6\xC7\xC8\xC9\xCA\xCB\xCC\xCD\xCE\xCF")
    tlv = {key: value for key, value in Tlv.parse(response[5:], verbose=True)}

    def parse_version(value):
        return f"{value[0]}.{value[1]}.{value[2]}.{value[3]}"

    return DeviceInfo(
        cmd_return=response,
        svpp_software_version=parse_version(tlv[193]),
        svpp_software_version_int=int.from_bytes(tlv[193], byteorder="big"),
        emvl1_kernel_version=parse_version(tlv[194]),
        emvl2_kernel_version=tlv[195].decode("ASCII"),
        emv_cfg=tlv[196],
        part_number=tlv[198],
        terminal_serial_number=f"{(int.from_bytes(tlv[199], byteorder='big') >> 2):012}",
        display_text_version=tlv[200],
        max_payload_size=tlv[202][0] << 8 | tlv[202][1],
        battery_state=tlv[204][0],
        base_firmware_version=parse_version(tlv[206]),
        base_firmware_version_int=int.from_bytes(tlv[206], byteorder="big"))


async def echo(conn: ReaderConnection, b: bytes):
    response = await conn.exchange_command(b"\x01\xFE" + len(b).to_bytes(2, byteorder="big") + b)
    print(response)