Update pymodbus to 1.5.1

[pyup-bot]

This PR updates pymodbus from 1.3.2 to 1.5.1.

Changelog

1.5.1

------------------------------------------------------------
* Fix device information selectors
* Fixed behaviour of the MEI device information command as a server when an invalid object_id is provided by an external client.
* Add support for repeated MEI device information Object IDs (client/server)
* Added support for encoding device information when it requires more than one PDU to pack.
* Added REPR statements for all syncchronous clients
* Added `isError` method to exceptions, Any response received can be tested for success before proceeding.

 
 res = client.read_holding_registers(...)
 if not res.isError():
      proceed
 else:
      handle error or raise
 
* Add examples for MEI read device information request

1.5.0

------------------------------------------------------------
* Improve transaction speeds for sync clients (RTU/ASCII), now retry on empty happens only when retry_on_empty kwarg is passed to client during intialization

`client = Client(..., retry_on_empty=True)`

* Fix tcp servers (sync/async) not processing requests with transaction id > 255
* Introduce new api to check if the received response is an error or not (response.isError())
* Move timing logic to framers so that irrespective of client, correct timing logics are followed.
* Move framers from transaction.py to respective modules
* Fix modbus payload builder and decoder
* Async servers can now have an option to defer `reactor.run()` when using `Start<Tcp/Serial/Udo>Server(...,defer_reactor_run=True)`
* Fix UDP client issue while handling MEI messages (ReadDeviceInformationRequest)
* Add expected response lengths for WriteMultipleCoilRequest and WriteMultipleRegisterRequest
* Fix _rtu_byte_count_pos for GetCommEventLogResponse
* Add support for repeated MEI device information Object IDs
* Fix struct errors while decoding stray response
* Modbus read retries works only when empty/no message is received
* Change test runner from nosetest to pytest
* Fix Misc examples

1.4.0

------------------------------------------------------------
* Bug fix Modbus TCP client reading incomplete data
* Check for slave unit id before processing the request for serial clients
* Bug fix serial servers with Modbus Binary Framer
* Bug fix header size for ModbusBinaryFramer
* Bug fix payload decoder with endian Little
* Payload builder and decoder can now deal with the wordorder as well of 32/64 bit data.
* Support Database slave contexts (SqlStore and RedisStore)
* Custom handlers could be passed to Modbus TCP servers
* Asynchronous Server could now be stopped when running on a seperate thread (StopServer)
* Signal handlers on Asyncronous servers are now handled based on current thread
* Registers in Database datastore could now be read from remote clients
* Fix examples in contrib (message_parser.py/message_generator.py/remote_server_context)
* Add new example for SqlStore and RedisStore (db store slave context)
* Fix minor comaptibility issues with utilities.
* Update test requirements
* Update/Add new unit tests
* Move twisted requirements to extra so that it is not installed by default on pymodbus installtion

Links

• PyPI: https://pypi.org/project/pymodbus
• Changelog: https://pyup.io/changelogs/pymodbus/
• Repo: https://github.com/riptideio/pymodbus/
• Docs: https://pythonhosted.org/pymodbus/

[pyup-bot]

Closing this in favor of #128