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"""Test server working as slave on a multidrop RS485 line."""
import pytest
from pymodbus.exceptions import ModbusIOException
from pymodbus.framer import FramerRTU, FramerSocket
from pymodbus.pdu import DecodePDU
class TestFaultyResponses:
"""Test that server works on a multidrop line."""
good_frame = b"\x00\x01\x00\x00\x00\x05\x00\x03\x02\x00\x01"
@pytest.fixture(name="framer")
def fixture_framer(self):
"""Prepare framer."""
return FramerSocket(DecodePDU(False))
def test_ok_frame(self, framer):
"""Test ok frame."""
used_len, pdu = framer.processIncomingFrame(self.good_frame)
assert pdu
assert used_len == len(self.good_frame)
def test_1917_frame(self):
"""Test invalid frame in issue 1917."""
recv = b"\x01\x86\x02\x00\x01"
framer = FramerRTU(DecodePDU(False))
used_len, pdu = framer.processIncomingFrame(recv)
assert not pdu
assert not used_len
def test_faulty_frame1(self, framer):
"""Test ok frame."""
faulty_frame = b"\x00\x04\x00\x00\x00\x05\x00\x03\x0a\x00\x04"
with pytest.raises(ModbusIOException):
framer.processIncomingFrame(faulty_frame)
used_len, pdu = framer.processIncomingFrame(self.good_frame)
assert pdu
assert used_len == len(self.good_frame)
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