pymodbus v3.8.6

• Allow id=0 and check if response.id == request.id. (#2572)

It turns out that not allowing id=0 was too restrictive, instead now requests with id=0 is allowed provided the device responds with id=0.

pymodbus v3.8.5

• New simulator is WIP, not to be used. (#2568)
• dev_id=0 no response expected (returns ExceptionResponse(0xff)). (#2567)
• New simulator datastore. (#2535)

pymodbus v3.8.4

• Parameterize string encoding in convert_to_registers and convert_from_registers (#2558)
• Fix client modbus function calls in remote by adding count as keyword argument (#2563)
• Fix exception text in ModbusPDU.validateAddress (#2551)
• Typo arround no_response_expected (#2550)
• Trace new connection in server. (#2549)
• Add trace to server.
• Update misleading DATATYPE text. (#2547)
• Fix pylint.
• Clarify server usage.
• Solve instable transaction testing. (#2538)

v3.8.3

Bug fix release, and remove the deprecated tag on payload.

The main goals have changed, please see https://pymodbus.readthedocs.io/en/latest/source/roadmap.html

For details on the payload decoder/encoder please see #2525

Changes:

• Remove deprecate from payload. (#2532)
• Add background parameter to servers. (#2529)
• Split async_io.py and simplify server start/stop. (#2528)
• Update custom_msg example to include server. (#2527)
• Move repl doc to repl repo. (#2522)
• Add API to set max until disconnect. (#2521)

Pymodbus v3.8.2

• Asyncio future removed from sync client. (#2514)

Pymodbus v3.8.1

• Convert endianness (#2506)
• Fix sync serial client, loop. (#2510)
• Correct future. (#2507)
• Correct #2501 (#2504)
• Raise exception on no response in async client. (#2502)
• re-instatiate Future on reconnect (#2501)
• Remove all trailing zeroes during string decoding (#2493)
• Fix too many sync client log messages. (#2491)

Pymodbus v3.8.0

This is the biggest release since 3.0.0, it contains:

• new framer concept (utility class instead of direct)
• new much simpler transactionManager
• trace methods to trace/modify incoming/outgoing byte streams as well as PDUs
• A lot of bug fixes

Version 3.8.0

• slave_id -> dev_id (internally). (#2486)
• Pin python 3.13.0 and update ruff. (#2487)
• Add documentation link to README. (#2483)
• Add datatype bits to convert_to/from_registers. (#2480)
• Add trace API to server. (#2479)
• Add trace API for client. (#2478)
• Integrate TransactionManager in server. (#2475)
• Rename test/sub_. (#2473)
• Check server closes file descriptors. (#2472)
• Update http_server.py (#2471)
• Restrict write_registers etc to list[int]. (#2469)
• Write_registers/pdu typing again. (#2468)
• Remove ModbusExceptions enum. (#2467)
• Add special ssl socket handling of "no data". (#2466)
• Add tip that values= will be modified to list[int]. (#2465)
• client 100% test coverage (#2396)
• Extend TransactionManager to handle sync. (#2457)
• Add convert_from to simple examples. (#2458)
• New async transaction manager. (#2453)
• Deprecate BinaryPayloadDecoder / BinaryPayloadBuilder. (#2456)
• Correct close for server transport. (#2455)
• RTU frame problem, when received split. (#2452)
• pdu, 100% coverage. (#2450)
• Refactor PDU, add strong typing to base classes. (#2438)
• Enforce keyword only parameters. (#2448)
• Fix read_device_information with sync client. (#2441)
• Simplify syncTransactionManager. (#2443)
• Import examples direct. (#2442)
• rename ModbusExceptions enums to legal constants. (#2436)
• Add typing to examples. (#2435)
• Refactor PDU diag. (#2421)
• Fix client lock, Parallel API calls are not permitted. (#2434)
• Ensure accept_no_response_limit > retries. (#2433)
• Check client and frametype. (#2426)
• Add MDAP to TLS frame. (#2425)
• Clean/Finalize testing for bit functions. (#2420)
• Simplify pdu bit, remove skip_encode. (#2417)
• remove zero_mode parameter. (#2354)
• Prepare refactor messages. (#2416)
• Fixed handle local echo in serialserver (#2415)
• Correct minor framer/pdu errors. (#2407)
• Rtu decode frames without byte count. (#2412)
• Improve type of parameter values of write_registers (#2411)
• PDU lookupClass work with sub function code. (#2410)
• Correct wait_next_api link in README. (#2406)

Pymodbus v3.7.4

Version v3.7.3 contains a critical bug, that makes the sync. client disconnect/connect with every request, thus adding a large delay.

• Clean PDU init. (#2399)
• Wrong close, when transaction do not match. (#2401)
• Remove unmaintained (not working) example contributions. (#2400)
• All pdu (incl. function code) tests to pdu directory. (#2397)
• Add no_response_expected argument to requests (#2385)
• Resubmit: Don't close/reopen tcp connection on single modbus message timeout (#2350)
• 100% test coverage for PDU. (#2394)
• Type DecodePDU. (#2392)
• Update to use DecodePDU. (#2391)
• Client/Server decoder renamed and moved to pdu. (#2390)
• Move client/server decoder to pdu. (#2388)
• Introducing PyModbus Guru on Gurubase.io (#2387)
• Remove IllegalFunctionRequest. (#2384)
• remove ModbusResponse. (#2383)
• Add typing to pdu base classes. (#2380)
• Updated roadmap.
• remove databuffer from framer. (#2379)
• Improve retries for sync client. (#2377)
• Move process test to framer tests (#2376)
• Framer do not check ids (#2375)
• Remove callback from framer. (#2374)
• Auto fill device ids for clients. (#2372)
• Reenable multidrop tests. (#2370)
• write_register/s accept bytes or int. (#2369)
• roadmap corrections.
• Added roadmap (not written in stone). (#2367)
• Update README to show python 3.13.
• Test on Python 3.13 (#2366)
• Use @AbstractMethod (#2365)
• Corrected smaller documentation bugs. (#2364)
• README as landing page in readthedocs. (#2363)

Pymodbus v3.7.3

Bug fix release and framers updated.

Details:

• Readme file renamed (#2357)
• Remove old framers (#2358)
• frameProcessIncomingPacket removed (#2355)
• Cleanup framers (reduce old_framers) (#2342)
• Run CI on PR targeted at wait_next_api.
• Sync client, allow unknown recv msg size. (#2353)
• integrate old rtu framer in new framer (#2344)
• Update README.rst (#2351)
• Client.close should not allow reconnect= (#2347)
• Remove async client.idle_time(). (#2349)
• Client doc, add common methods (base). (#2348)
• Reset receive buffer with send(). (#2343)
• Remove unused protocol_id from pdu (#2340)
• CI run on demand on non-protected branches. (#2339)
• Server listener and client connections have is_server set. (#2338)
• Reopen listener in server if disconnected. (#2337)
• Regroup test. (#2335)
• Improve docs around sync clients and reconnection (#2321)
• transport 100% test coverage (again) (#2333)
• Update actions to new node.js. (#2332)
• Bump 3rd party (#2331)
• Documentation on_connect_callback (#2324)
• Fixes the unexpected implementation of the ModbusSerialClient.connected property (#2327)
• Forward error responses instead of timing out. (#2329)
• Add stacklevel=2 to logging functions (#2330)
• Fix encoding & decoding of ReadFileRecordResponse (#2319)
• Improvements for example/contib/solar (#2318)
• Update solar.py (#2316)
• Remove double conversion in int (#2315)
• Complete pull request #2310 (#2312)
• fixed type hints for write_register and write_registers (#2309)
• Remove _header from framers. (#2305)

pymodbus v3.7.2

v3.7.1 had wrong documentation.

• Correct README
• Rename branch wait3.8.0 to wait_next_API