Release PyModbus v1.5.2 · pymodbus-dev/pymodbus

Version 1.5.2

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

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