def test_create_from_request_pdu_raising_illegal_data_value_error(self):
function_code = ReadCoils.function_code
address = 100
quantity = ReadCoils.max_quantity + 1
pdu = struct.pack('>BHH', function_code, address, quantity)
with pytest.raises(IllegalDataValueError):
ReadCoils.create_from_request_pdu(pdu)
def test_create_function_from_response_pdu():
read_coils = ReadCoils()
read_coils.starting_address = 1
read_coils.quantity = 9
req_pdu = read_coils.request_pdu
resp_pdu = struct.pack('>BBB', 1, 1, 3)
assert isinstance(create_function_from_response_pdu(resp_pdu, req_pdu),
ReadCoils)
def test_create_function_from_response_pdu():
read_coils = ReadCoils()
read_coils.starting_address = 1
read_coils.quantity = 9
req_pdu = read_coils.request_pdu
resp_pdu = struct.pack('>BBB', 1, 1, 3)
assert isinstance(create_function_from_response_pdu(resp_pdu, req_pdu),
ReadCoils)
def read_coils(slave_id, starting_address, quantity):
""" Return ADU for Modbus function code 01: Read Coils.
:param slave_id: Number of slave.
:return: Byte array with ADU.
"""
function = ReadCoils()
function.starting_address = starting_address
function.quantity = quantity
return _create_request_adu(slave_id, function.request_pdu)
def read_coils(slave_id, starting_address, quantity):
""" Return ADU for Modbus function code 01: Read Coils.
:param slave_id: Number of slave.
:return: Byte array with ADU.
"""
function = ReadCoils()
function.starting_address = starting_address
function.quantity = quantity
return _create_request_adu(slave_id, function.request_pdu)
def read_coils():
function_code = 1
starting_address = 100
quantity = 3
pdu = struct.pack('>BHH', function_code, starting_address, quantity)
return ReadCoils.create_from_request_pdu(pdu)
def test_create_from_request_pdu(self):
""" Call should return instance with correct attributes and vaules. """
function_code = 1
starting_address = 100
quantity = 3
pdu = struct.pack('>BHH', function_code, starting_address, quantity)
function = ReadCoils.create_from_request_pdu(pdu)
assert function.starting_address == starting_address
assert function.quantity == quantity
def read_coils():
instance = ReadCoils()
instance.starting_address = 100
instance.quantity = 3
return instance
def test_read_coils_response_pdu(read_coils):
response_pdu = read_coils.create_response_pdu([0, 1, 1])
instance = ReadCoils.create_from_response_pdu(
response_pdu, read_coils.request_pdu) # NOQA
assert instance.data == [0, 1, 1]
def test_read_coils_request_pdu(read_coils):
instance = ReadCoils.create_from_request_pdu(read_coils.request_pdu)
assert instance.starting_address == 100
assert instance.quantity == 3
def read_coils():
instance = ReadCoils()
instance.starting_address = 100
instance.quantity = 3
return instance
def test_read_coils_response_pdu(read_coils):
response_pdu = read_coils.create_response_pdu([0, 1, 1])
instance = ReadCoils.create_from_response_pdu(response_pdu, read_coils.request_pdu) # NOQA
assert instance.data == [0, 1, 1]
def test_read_coils_request_pdu(read_coils):
instance = ReadCoils.create_from_request_pdu(read_coils.request_pdu)
assert instance.starting_address == 100
assert instance.quantity == 3
