Remark: for pymodbus use the minimum version of 3.9.x, testetd with pymodbus==3.9.2 The device UnitID has the value 3 as default. If you are not sure you can use the function read_device_unit_id() to ...
Make possible to write modbus TCP and RTU master and slave. It can be used for testing purpose : It is shipped with slave simulator and a master with a web-based hmi (ok the hmi need to be improved :) ...