ModbusServerContext hardcoded value of 0xF7 used for __delitem__ func

[sush2023]

Currently using version 3.8.0, same behavior for version ~3.9

The delitem func ensures the slave parameter is between 0xF7 and 0 before deleting the key/node. While I am able to have a slave at an address higher with proper functionality, deleting is not working due to that code throwing an exception.

Line of interest:

pymodbus/pymodbus/datastore/context.py

Line 203 in 28eb319

if not self.single and (0xF7 >= device_id >= 0x00):

could this be configurable? This is technically supposed to be outside of the boundaries but these are also considered "reserved" and therefore usable. Thanks

[janiversen]

pull requests are welcome.

however I am not sure why you would first add a device and then later delete it. If you delete a device in a running in a running server you will sooner or later have a server breakdown.

[sush2023]

Ideally it would be best to be able to have the device not respond at a certain address temporarily. Removing seemed to be the most plausible option.

[janiversen]

not responding temporarily is easier done with the trace functions or with the simulator, it is not part of the data definition

[janiversen]

Closing as this is not a pymodbus bug.